Husqvarna Chainsaw 1153136 26 User Manual

Operators manual  
445 445e 450e  
Please read the operator’s manual carefully and make sure you understand the instructions before using the machine.  
English  
1153136-26 Rev.1 2009-12-29  
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6 – English  
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KEY TO SYMBOLS  
Symbols on the machine:  
Symbols in the operator’s  
WARNING! Chain saws can be  
dangerous! Careless or incorrect use can  
result in serious or fatal injury to the  
operator or others.  
manual:  
Switch off the engine before carrying  
out any checks or maintenance.  
CAUTION! The start/stop switch  
automatically returns to run position.  
In order to prevent unintentional  
starting, the spark plug cap must be  
removed from the spark plug when  
assembling, checking and/or  
Please read the operator’s manual  
carefully and make sure you  
understand the instructions before  
using the machine.  
Always wear:  
performing maintenance.  
Approved protective helmet  
Approved hearing protection  
Protective goggles or a visor  
Always wear approved protective gloves.  
Regular cleaning is required.  
Visual check.  
This product is in accordance with  
applicable EC directives.  
Noise emission to the environment  
according to the European  
Community’s Directive. The machine’s  
emission is specified in chapter  
Technical data and on label.  
Protective goggles or a visor must be  
worn.  
Chain brake, activated (right)  
Chain brake, not activated (left)  
Refuelling.  
Decompression valve: The valve  
is to reduce the pressure in the cylinder  
and make starting easier.You should  
always use the decompression valve  
when starting the machine.  
Filling with oil and adjusting oil flow.  
Ignition; choke: Set the choke control  
in the choke position. This should  
automatically set the stop switch to the  
start position.  
The chain brake must be engaged when  
the chain saw is started.  
WARNING! Kickback may occur when  
the nose or tip of the guide bar touches  
an object, and cause a lightning fast  
reverse reaction, kicking the guide bar  
up and towards the operator. May cause  
serious personal injury.  
Air purge  
Adjustment of the oil pump  
Other symbols/decals on the machine refer to special  
certification requirements for certain markets.  
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CONTENTS  
Contents  
KEY TO SYMBOLS  
Symbols on the machine: ...................................... 7  
Symbols in the operator’s manual: ........................ 7  
CONTENTS  
Contents ............................................................... 8  
INTRODUCTION  
Dear Customer, ..................................................... 9  
WHAT IS WHAT?  
What is what on the chain saw? ........................... 9  
GENERAL SAFETY PRECAUTIONS  
Before using a new chain saw .............................. 10  
Important .............................................................. 10  
Always use common sense .................................. 11  
Personal protective equipment ............................. 11  
Machines safety equipment ................................. 11  
Cutting equipment ................................................. 13  
ASSEMBLY  
Fitting the bar and chain ....................................... 17  
FUEL HANDLING  
Fuel ....................................................................... 18  
Fuelling ................................................................. 19  
Fuel safety ............................................................ 19  
STARTING AND STOPPING  
Starting and stopping ............................................ 20  
WORKING TECHNIQUES  
Before use: ............................................................ 22  
General working instructions ................................ 22  
How to avoid kickback ........................................... 25  
MAINTENANCE  
General ................................................................. 26  
Carburettor adjustment ......................................... 26  
Checking, maintaining and servicing chain saw  
safety equipment .................................................. 26  
Muffler ................................................................... 27  
Starter ................................................................... 27  
Air filter .................................................................. 28  
Spark plug ............................................................. 28  
Lubricating the bar tip sprocket ............................. 28  
Needle bearing lubrication .................................... 28  
Cooling system ..................................................... 29  
”Air Injection” centrifugal cleaning ......................... 29  
Winter use ............................................................. 29  
Maintenance schedule .......................................... 30  
TECHNICAL DATA  
Technical data ....................................................... 31  
Bar and chain combinations ................................. 32  
Saw chain filing and file gauges ........................... 32  
EC-declaration of conformity ................................ 33  
8 – English  
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INTRODUCTION  
What is what on the chain saw?  
Dear Customer,  
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Cylinder cover  
Congratulations on your choice to buy a Husqvarna  
product! Husqvarna is based on a tradition that dates  
back to 1689, when the Swedish King Karl XI ordered the  
construction of a factory on the banks of the Husqvarna  
River, for production of muskets.The location was logical,  
since water power was harnessed from the Huskvarna  
River to create the water-powered plant. During the more  
than 300 years of beeing, the Husqvarna factory has  
produced a lot of different products, from wood stoves to  
modern kitchen appliances, sewing machines, bicycles,  
motorcycles etc. In 1956, the first motor driven lawn  
mowers appeared, followed by chain saws in 1959, and it  
is within this area Husqvarna is working today.  
Decompression valve  
Air purge  
Start reminder  
Combined start and stop switch  
Rear handle  
Information and warning decal  
Fuel tank  
Adjuster screws carburettor  
10 Starter handle  
11 Starter  
Today Husqvarna is one of the leading manufacturers in  
the world of forest and garden products, with quality as  
our highest priority. The business concept is to develop,  
manufacture and market motor driven products for  
forestry and gardening as well as for building and  
construction industry. Husqvarnas aim is also to be in the  
front edge according to ergonomics, usability, security  
and environmental protection. That is the reason why we  
have developed many different features to provide our  
products within these areas.  
12 Chain oil tank  
13 Product and serial number plate  
14 Felling direction mark  
15 Front handle  
16 Front hand guard  
17 Muffler  
18 Chain  
We are convinced that you will appreciate with great  
satisfaction the quality and performance of our product for  
a very long time to come. The purchase of one of our  
products gives you access to professional help with  
repairs and service whenever this may be necessary. If  
the retailer who sells your machine is not one of our  
authorised dealers, ask for the address of your nearest  
service workshop.  
19 Bar tip sprocket  
20 Bar  
21 Spike bumper  
22 Chain catcher  
23 Chain tensioning screw  
24 Clutch cover  
It is our wish that you will be satisfied with your product  
and that it will be your companion for a long time.Think of  
this operators manual as a valuable document. By  
following itscontent (using, service, maintenance etc) the  
life span and the second-hand value of the machine can  
be extended. If you will sell this machine, make sure that  
the buyer will get the operators manual.  
25 Right hand guard  
26 Throttle control  
27 Throttle lockout  
28 Chain tensioner wheel (445e, 450e)  
29 Knob (445e, 450e)  
30 Operators manual  
31 Bar guard  
Thank you for using a Husqvarna product.  
32 Combination spanner  
Husqvarna AB has a policy of continuous product  
development and therefore reserves the right to modify  
the design and appearance of products without prior  
notice.  
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GENERAL SAFETY PRECAUTIONS  
Before using a new chain saw  
WARNING! Never allow children to use or  
be in the vicinity of the machine. As the  
machine is equipped with a spring-  
loaded stop switch and can be started by  
low speed and force on the starter  
handle, even small children under some  
circumstances can produce the force  
necessary to start the machine.This can  
mean a risk of serious personal injury.  
Therefore remove the spark plug cap  
when the machine is not under close  
supervision.  
Please read this manual carefully.  
!
(1) - (113) refer to figures on p. 2-6.  
Check that the cutting equipment is correctly fitted  
and adjusted. See instructions under the heading  
Assembly.  
Refuel and start the chain saw. See the instructions  
under the headings Fuel Handling and Starting and  
Stopping.  
Do not use the chain saw until sufficient chain oil has  
reached the chain. See instructions under the  
heading Cutting equipment.  
Important  
IMPORTANT!  
Long-term exposure to noise can result in permanent  
hearing impairment. So always use approved hearing  
protection.  
This chain saw for forest service is designed for forest  
work such as felling, delimbing and cutting.  
WARNING! Under no circumstances may  
You should only use the saw with the bar and chain  
combinations we recommend in the chapter Technical  
data.  
the design of the machine be modified  
!
without the permission of the  
manufacturer. Always use genuine  
accessories. Non-authorized  
Never use the machine if you are fatigued, while under  
the influence of alcohol or drugs, medication or anything  
that could affect your vision, alertness, coordination or  
judgement.  
modifications and/or accessories can  
result in serious personal injury or the  
death of the operator or others.  
Wear personal protective equipment. See instructions  
under the heading ”Personal protective equipment”.  
WARNING! A chain saw is a dangerous  
tool if used carelessly or incorrectly and  
!
Do not modify this product or use it if it appears to have  
been modified by others.  
can cause serious, even fatal injuries. It  
is very important that you read and  
understand the contents of this  
operator’s manual.  
Never use a machine that is faulty.Carry out the checks,  
maintenance and service instructions described in this  
manual. Some maintenance and service measures  
must be carried out by trained and qualified specialists.  
See instructions under the heading Maintenance.  
WARNING! The inside of the muffler  
contain chemicals that may be  
!
Never use any accessories other than those  
recommended in this manual. See instructions under  
the headings Cutting equipment and Technical data.  
carcinogenic. Avoid contact with these  
elements in the event of a damaged  
muffler.  
CAUTION! Always wear protective glasses or a face  
visor to reduce the risk of injury from thrown objects. A  
chain saw is capable of throwing objects, such as wood  
chips, small pieces of wood, etc, at great force.This can  
result in serious injury, especially to the eyes.  
WARNING! Long term inhalation of the  
engine’s exhaust fumes, chain oil mist  
!
and dust from sawdust can represent a  
health risk.  
WARNING! Running an engine in a  
WARNING! This machine produces an  
confined or badly ventilated area can  
!
electromagnetic field during operation.  
!
result in death due to asphyxiation or  
carbon monoxide poisoning.  
This field may under some  
circumstances interfere with active or  
passive medical implants.To reduce the  
risk of serious or fatal injury, we  
recommend persons with medical  
implants to consult their physician and  
the medical implant manufacturer before  
operating this machine.  
WARNING! Faulty cutting equipment or  
the wrong combination of bar and saw  
!
chain increases the risk of kickback!  
Only use the bar/saw chain combinations  
we recommend, and follow the filing  
instructions. See instructions under the  
heading Technical data.  
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GENERAL SAFETY PRECAUTIONS  
carried out correctly and if service and/or repairs are not  
carried out professionally. If you need further information  
please contact your nearest service workshop.  
Always use common sense (2)  
It is not possible to cover every conceivable situation you  
can face when using a chain saw. Always exercise care  
and use your common sense. Avoid all situations which  
you consider to be beyond your capability. If you still feel  
uncertain about operating procedures after reading these  
instructions, you should consult an expert before  
WARNING! Never use a machine with  
defective safety components. Safety  
!
equipment must be inspected and  
maintained. See instructions under the  
heading Checking, maintaining and  
servicing chain saw safety equipment. If  
your machine does not pass all the  
checks, take the saw to a servicing  
dealer for repair.  
continuing. Do not hesitate to contact your dealer or us if  
you have any questions about the use of the chain saw.  
We will willingly be of service and provide you with advice  
as well as help you to use your chain saw both efficiently  
and safely. Attend a training course in chain saw usage if  
possible.Your dealer, forestry school or your library can  
provide information about which training materials and  
courses are available. Work is constantly in progress to  
improve the design and technology - improvements that  
increase your safety and efficiency. Visit your dealer  
regularly to see whether you can benefit from new  
features that have been introduced.  
Chain brake and front hand guard  
Your chain saw is equipped with a chain brake that is  
designed to stop the chain if you get a kickback.The chain  
brake reduces the risk of accidents, but only you can  
prevent them. (3)  
Take care when using your saw and make sure the  
kickback zone of the bar never touches any object. (4)  
Personal protective equipment  
The chain brake (A) can either be activated manually  
(by your left hand) or automatically by the inertia  
release mechanism. (5)  
WARNING! Most chain saw accidents  
happen when the chain touches the  
!
operator.You must use approved  
personal protective equipment whenever  
you use the machine. Personal protective  
equipment cannot eliminate the risk of  
injury but it will reduce the degree of  
injury if an accident does happen. Ask  
your dealer for help in choosing the right  
equipment.  
The brake is applied when the front hand guard (B) is  
pushed forwards. (5)  
This movement activates a spring-loaded mechanism  
that tightens the brake band (C) around the engine  
drive system (D) (clutch drum). (6)  
The front hand guard is not designed solely to activate  
the chain brake. Another important feature is that it  
reduces the risk of your left hand hitting the chain if  
you lose grip of the front handle.  
Approved protective helmet  
Hearing protection  
The chain brake must be engaged when the chain  
saw is started to prevent the saw chain from rotating.  
(52)  
Protective goggles or a visor  
Gloves with saw protection  
Trousers with saw protection  
Boots with saw protection, steel toe-cap and non-slip  
sole  
Use the chain brake as a ”parking brake” when  
starting and when moving over short distances, to  
reduce the risk of moving chain accidentally hitting  
your leg or anyone or anything close by. Do not leave  
the chain saw switched on with the chain brake  
activated for long periods.The chain saw can become  
very hot.  
Always have a first aid kit nearby.  
Fire Extinguisher and Shovel  
Generally clothes should be close-fitting without  
restricting your freedom of movement.  
The chain brake is released by moving the front hand  
guard marked ”PULL BACK TO RESET” back,  
towards the front handle.  
IMPORTANT! Sparks can come from the muffler, the bar  
and chain or other sources. Always have fire  
extinguishing tools available if you should need them.  
Help prevent forest fires.  
Kickback can be very sudden and violent. Most  
kickbacks are minor and do not always activate the  
chain brake. If this happens you should hold the chain  
saw firmly and not let go. (56)  
Machines safety equipment  
The way the chain brake is activated, either manually  
or automatically by the inertia release mechanism,  
depends on the force of the kickback and the position  
of the chain saw in relation to the object that the  
kickback zone of the bar strikes.  
In this section the machine’s safety features and their  
function are explained. For inspection and maintenance  
see instructions under the heading Checking, maintaining  
and servicing chain saw safety equipment. See  
If you get a violent kickback while the kickback zone of  
the bar is farthest away from you the chain brake is  
designed to be activated by the inertia in the kickback  
direction. (7)  
instructions under the heading, What is what?, to find  
where these parts are located on your machine.  
The life span of the machine can be reduced and the risk  
of accidents can increase if machine maintenance is not  
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GENERAL SAFETY PRECAUTIONS  
If the kickback is less violent or the kickback zone of  
Chain catcher  
the bar is closer to you the chain brake will be  
activated manually by the movement of your left hand.  
In the felling position the left hand is in a position that  
makes manual activation of the chain brake  
impossible. With this type of grip, that is when the left  
hand is placed so that it cannot affect the movement  
of the front hand guard, the chain brake can only be  
activated by the inertia action. (8)  
The chain catcher is designed to catch the chain if it  
snaps or jumps off.This should not happen if the chain is  
properly tensioned (see instructions under the heading  
Assembly) and if the bar and chain are properly serviced  
and maintained (see instructions under the heading  
General working instructions). (10)  
Right hand guard  
Apart from protecting your hand if the chain jumps or  
snaps, the right hand guard stops branches and twigs  
from interfering with your grip on the rear handle. (11)  
Will my hand always activate the chain  
brake during a kickback?  
Vibration damping system  
No. It takes a certain force to move the hand guard  
forward. If your hand only lightly touches the front guard  
or slips over it, the force may not be enough to trigger the  
chain brake.You should also maintain a firm grip of the  
chain saw handles while working. If you do and  
experience a kickback, your hand may never leave the  
front handle and will not activate the chain brake, or the  
chain brake will only activate after the saw has swung  
around a considerable distance. In such instances, the  
chain brake might not have enough time to stop the saw  
chain before it touches you.  
Your machine is equipped with a vibration damping  
system that is designed to minimize vibration and make  
operation easier.  
The machines vibration damping system reduces the  
transfer of vibration between the engine unit/cutting  
equipment and the machines handle unit.The body of the  
chain saw, including the cutting equipment, is insulated  
from the handles by vibration damping units.  
Cutting hardwoods (most broadleaf trees) creates more  
vibration than cutting softwoods (most conifers). Cutting  
with cutting equipment that is blunt or faulty (wrong type  
or badly sharpened) will increase the vibration level.  
There are also certain positions in which your hand  
cannot reach the front hand guard to activate the chain  
brake; for example, when the saw chain is held in felling  
position.  
WARNING! Overexposure to vibration  
can lead to circulatory damage or nerve  
!
Will my inertia activated chain brake  
always activate during kickback in the  
event of a kickback?  
damage in people who have impaired  
circulation. Contact your doctor if you  
experience symptoms of overexposure  
to vibration. Such symptoms include  
numbness, loss of feeling, tingling,  
pricking, pain, loss of strength, changes  
in skin colour or condition.These  
symptoms normally appear in the  
fingers, hands or wrists.These  
No. First your brake must be in working order.Testing the  
brake is simple, see instructions under the heading  
Checking, maintaining and servicing chain saw safety  
equipment.We recommend you do before you begin each  
work session. Second the kickback must be strong  
enough to activate the chain brake. If the chain brake is  
too sensitive it would activate all the time which would be  
a nuisance.  
symptoms may be increased in cold  
temperatures.  
Stop switch  
Will my chain brake always protect me  
from injury in the event of a kickback?  
Use the stop switch to switch off the engine. (12)  
Muffler  
No. First, the chain brake must be in working order to  
provide the intended protection. Second, it must be  
activated during the kickback as described above to stop  
the saw chain.Third, the chain brake may be activated but  
if the bar is too close to you the brake might not have  
enough time to slow down and stop the chain before the  
chain saw hits you.  
The muffler is designed to keep noise levels to a minimum  
and to direct exhaust fumes away from the user.  
WARNING! The exhaust fumes from the  
engine are hot and may contain sparks  
!
which can start a fire. Never start the  
machine indoors or near combustible  
material!  
Only you and proper working technique can eliminate  
kickback and its danger.  
In areas with a hot, dry climate there is a high risk of fires.  
These areas are sometimes subject to government rules  
requiring among other things the muffler must be  
equipped with an approved type of spark arrestor mesh.  
(13)  
When fitting the mesh, make sure that the mesh is  
inserted in the right position. If necessary, use the  
combination spanner to insert or remove the mesh.  
Throttle lockout  
The throttle lockout is designed to prevent accidental  
operation of the throttle control. When you press the lock  
(A) (i.e. when you grasp the handle) it releases the throttle  
control (B). When you release the handle the throttle  
control and the throttle lockout both move back to their  
original positions.This arrangement means that the throttle  
control is automatically locked at the idle setting. (9)  
12 – English  
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GENERAL SAFETY PRECAUTIONS  
By using cutting equipment with ”built-in” kickback  
reduction and keeping the chain sharp and well-  
maintained you can reduce the effects of kickback.  
CAUTION! The muffler gets very hot during and after  
use.This also applies during idling. Be aware of the fire  
hazard, especially when working near flammable  
substances and/or vapours.  
Bar  
The smaller the tip radius the lower the chance of  
kickback.  
WARNING! Never use a saw without a  
Chain  
muffler, or with a damaged muffler. A  
!
A chain is made up of a number of links, which are  
available in standard and low-kickback versions.  
damaged muffler may substantially  
increase the noise level and the fire  
hazard. Keep fire fighting equipment  
handy. If a spark arrestor screen is  
required in your area, never use the saw  
without or with a broken spark arrestor  
screen.  
IMPORTANT! No saw chain design eliminates the  
danger of kickback.  
WARNING! Any contact with a rotating  
saw chain can cause extremely serious  
!
Cutting equipment  
injuries.  
This section describes how to choose and maintain your  
cutting equipment in order to:  
Some terms that describe the bar and chain  
To maintain the safety features of the cutting equipment,  
you should replace a worn or damaged bar or chain with  
a bar and chain combinations recommended by  
Husqvarna. See instructions under the heading Technical  
Data for a list of replacement bar and chain combinations  
we recommend.  
Reduce the risk of kickback.  
Reduce the risk of the saw chain breaking or jumping  
off the bar.  
Obtain optimal cutting performance.  
Extend the life of cutting equipment.  
Avoid increasing vibration levels.  
Bar  
Length (inches/cm)  
General rules  
Number of teeth on bar tip sprocket (T).  
Only use cutting equipment recommended by us!  
See instructions under the heading Technical data.  
Keep the chain’s cutting teeth properly  
Chain pitch (inches). The spacing between the drive  
links of the chain must match the spacing of the teeth  
on the bar tip sprocket and drive sprocket. (14)  
Number of drive links. The number of drive links is  
determined by the length of the bar, the chain pitch  
and the number of teeth on the bar tip sprocket.  
Bar groove width (inches/mm). The groove in the bar  
must match the width of the chain drive links.  
Chain oil hole and hole for chain tensioner. The bar  
must be matched to the chain saw design. (15)  
sharpened! Follow our instructions and use the  
recommended file gauge. A damaged or badly  
sharpened chain increases the risk of accidents.  
Maintain the correct depth gauge setting! Follow  
our instructions and use the recommended depth  
gauge clearance. Too large a clearance increases  
the risk of kickback.  
Keep the chain properly tensioned! If the chain is  
slack it is more likely to jump off and lead to increased  
wear on the bar, chain and drive sprocket.  
Keep cutting equipment well lubricated and  
properly maintained! A poorly lubricated chain is  
more likely to break and lead to increased wear on the  
bar, chain and drive sprocket.  
Chain  
Chain pitch (inches) (14)  
Drive link width (mm/inches) (16)  
Number of drive links. (17)  
Sharpening your chain and adjusting  
depth gauge setting  
Cutting equipment designed to reduce  
kickback  
General information on sharpening cutting teeth  
Never use a blunt chain. When the chain is blunt you  
have to exert more pressure to force the bar through  
the wood and the chips will be very small. If the chain  
is very blunt it will produce wood powder and no chips  
or shavings.  
WARNING! Faulty cutting equipment or  
the wrong combination of bar and saw  
!
chain increases the risk of kickback!  
Only use the bar/saw chain combinations  
we recommend, and follow the filing  
instructions. See instructions under the  
heading Technical data.  
A sharp chain eats its way through the wood and  
produces long, thick chips or shavings.  
The cutting part of the chain is called the cutter and  
consists of a cutting tooth (A) and the depth gauge  
(B). The cutters cutting depth is determined by the  
difference in height between the two (depth gauge  
setting). (18)  
The only way to avoid kickback is to make sure that the  
kickback zone of the bar never touches anything.  
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GENERAL SAFETY PRECAUTIONS  
When you sharpen a cutting tooth there are four important  
factors to remember.  
recommendation assumes that the length of the  
cutting teeth is not reduced excessively.  
1
2
3
4
Filing angle (19)  
Cutting angle (20)  
File position (21)  
Round file diameter  
You will need a flat file and a depth gauge tool. We  
recommend that you use our depth gauge tool to  
acheive the correct depth gauge setting and bevel for  
the depth gauge.  
Place the depth gauge tool over the chain. Detailed  
information regarding the use of the depth gauge tool,  
will be found on the package for the depth gauge tool.  
Use the flat file to file off the tip of the depth gauge that  
protrudes through the depth gauge tool. The depth  
gauge setting is correct when you no longer feel  
resistance as you draw the file along the depth gauge  
tool. (25)  
It is very difficult to sharpen a chain correctly without the  
right equipment. We recommend that you use our file  
gauge. This will help you obtain the maximum kickback  
reduction and cutting performance from your chain. (22)  
See instructions under the heading Technical data for  
information about sharpening your chain.  
WARNING! Departure from the  
sharpening instructions considerably  
Tensioning the chain  
!
increases the risk of kickback.  
Sharpening cutting teeth  
WARNING! A slack chain may jump off  
and cause serious or even fatal injury.  
!
To sharpen cutting teeth you will need a round file and a  
file gauge. See instructions under the heading Technical  
data for information on the size of file and gauge that are  
recommended for the chain fitted to your chain saw.  
The more you use a chain the longer it becomes. It is  
therefore important to adjust the chain regularly to take up  
the slack.  
Check that the chain is correctly tensioned. A slack  
chain will move sideways, making it more difficult to  
sharpen correctly.  
Check the chain tension every time you refuel. NOTE! A  
new chain has a running-in period during which you  
should check the tension more frequently.  
Always file cutting teeth from the inside face. Reduce  
the pressure on the return stroke. File all the teeth on  
one side first, then turn the chain saw over and file the  
teeth on the other side.  
Tension the chain as tightly as possible, but not so tight  
that you cannot pull it round freely by hand. (26)  
445  
File all the teeth to the same length. When the length  
of the cutting teeth is reduced to 4 mm (5/32") the  
chain is worn out and should be replaced. (23)  
General advice on adjusting depth gauge setting  
When you sharpen the cutting tooth (A) the depth  
gauge setting (C) will decrease. To maintain optimal  
cutting performance the depth gauge (B) has to be  
filed down to achieve the recommended depth gauge  
setting. See instructions under the heading Technical  
data to find the correct depth gauge setting for your  
particular chain. (24)  
Loosen the bar nut that holds the clutch cover and  
chain brake. Use the combination spanner. Then  
retighten the bar nut as tightly as you can by hand.  
(27)  
Raise the tip of the bar and stretch the chain by  
tightening the chain tensioning screw using the  
combination spanner. Tighten the chain until it does  
not sag from the underside of the bar. (28)  
Use the combination spanner to tighten the bar nut  
while holding up the tip of the bar. Check that you can  
pull the saw chain round freely by hand, and that there  
is no slack on the underside of the bar. (29)  
WARNING! The risk of kickback is  
increased if the depth gauge setting is  
!
too large!  
Adjustment of depth gauge setting  
The position of the chain tensioning screw on our chain  
saws varies from model to model. See instructions under  
the heading What is what? to find out where it is on your  
model.  
The cutting teeth should be newly sharpened before  
adjusting the depth gauge setting. We recommend  
that you adjust the depth gauge setting every third  
time you sharpen the cutting teeth. NOTE! This  
14 – English  
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GENERAL SAFETY PRECAUTIONS  
445e, 450e  
Checking chain lubrication  
Check the chain lubrication each time you refuel. See  
instructions under the heading Lubricating the bar tip  
sprocket.  
Aim the tip of the bar at a light coloured surface about  
20 cm (8 inches) away. After 1 minute running at 3/4  
throttle you should see a distinct line of oil on the light  
surface.  
Release the knob by folding it out. (30)  
Turn the knob anti clockwise to loosen the bar cover.  
(31)  
Adjust the tension on the chain by turning the wheel  
down (+) for tighter tension and up (-) to loosen the  
tension. (32)  
Tighten the bar clutch by turning the knob clockwise.  
(33)  
If the chain lubrication is not working:  
Check that the oil channel in the bar is not obstructed.  
Clean if necessary. (35)  
Check that the groove in the edge of the bar is clean.  
Clean if necessary. (36)  
Check that the bar tip sprocket turns freely and that  
the lubricating hole in the tip sprocket is not blocked.  
Clean and lubricate if necessary. (37)  
Fold the knob back in to lock the tensioning. (34)  
Lubricating cutting equipment  
If the chain lubrication system is still not working after  
carrying out the above checks and associated measures  
you should contact your service agent.  
WARNING! Poor lubrication of cutting  
equipment may cause the chain to snap,  
which could lead to serious, even fatal  
injuries.  
!
Chain drive sprocket  
Chain oil  
Chain oil must demonstrate good adhesion to the chain  
and also maintain its flow characteristics regardless of  
whether it is warm summer or cold winter weather.  
The clutch drum is fitted with one of the following drive  
sprockets:  
As a chain saw manufacturer we have developed an  
optimal chain oil which, with its vegetable oil base, is also  
biodegradable. We recommend the use of our own oil for  
both maximum chain life and to minimise environmental  
damage. If our own chain oil is not available, standard  
chain oil is recommended.  
A
drum)  
Spur sprocket (the chain sprocket is welded on the  
B
Rim sprocket (replaceable) (38)  
Regularly check the degree of wear on the drive sprocket.  
Replace if wear is excessive. Replace the drive sprocket  
whenever you replace the chain.  
Never use waste oil! Using waste oil can be dangerous  
to you and damage the machine and environment.  
Needle bearing lubrication  
IMPORTANT! When using vegetable based saw chain  
oil, dismantle and clean the groove in the bar and saw  
chain before long-term storage.Otherwise there is a risk  
of the saw chain oil oxidizing, which will result in the saw  
chain becoming stiff and the bar tip sprocket jamming.  
Both versions of sprockets have a needle bearing on the  
drive shaft, which has to be greased regularly (once a  
week). CAUTION! Use a high-quality bearing grease or  
engine oil.  
Filling with chain oil  
All our chain saws have an automatic chain lubrication  
system. On some models the oil flow is also  
adjustable.  
See instructions under the heading Maintenance, Needle  
bearing lubrication.  
Checking wear on cutting equipment  
The saw chain oil tank and the fuel tank are designed  
so that the fuel runs out before the saw chain oil.  
However, this safety feature requires that you use the  
right sort of chain oil (if the oil is too thin it will run out  
before the fuel), and that you adjust the carburetor as  
recommended (a lean mixture may mean that the fuel  
lasts longer than the oil) and that you also use the  
recommended cutting equipment (a bar that is too  
long will use more chain oil).  
Check the chain daily for:  
Visible cracks in rivets and links.  
Whether the chain is stiff.  
Whether rivets and links are badly worn.  
Replace the saw chain if it exhibits any of the points  
above.  
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English 15  
GENERAL SAFETY PRECAUTIONS  
We recommend you compare the existing chain with a  
new chain to decide how badly the existing chain is worn.  
File all the teeth to the same length. When the length of  
the cutting teeth is reduced to 4 mm (5/32") the chain is  
worn out and should be replaced.  
Bar  
Check regularly:  
Whether there are burrs on the edges of the bar.  
Remove these with a file if necessary.  
Whether the groove in the bar has become badly  
worn. Replace the bar if necessary.  
Whether the tip of the bar is uneven or badly worn. If  
a hollow forms on the underside of the bar tip this is  
due to running with a slack chain.  
To prolong the life of the bar you should turn it over  
regularly.  
WARNING! Most chain saw accidents  
happen when the chain touches the  
!
operator.  
Wear personal protective equipment. See  
instructions under the heading  
”Personal protective equipment”.  
Do not tackle any job that you feel you  
are not adequately trained for. See  
instructions under the headings  
Personal protective equipment, How to  
avoid kickback, Cutting equipment and  
General working instructions.  
Avoid situations where there is a risk of  
kickback. See instructions under the  
heading Machines safety equipment.  
Use the recommended protective  
equipment and check its condition. See  
instructions under the heading General  
working instructions.  
Check that all the chain saw safety  
features are working. See instructions  
under the headings General working  
instructions and General safety  
precautions.  
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ASSEMBLY  
Tension the chain by turning the wheel down (+). The  
Fitting the bar and chain  
chain should be tensioned until it does not sag from the  
underside of the bar. (32)  
The chain is correctly tensioned when it does not sag from  
the underside of the bar, but can still be turned easily by  
hand. Hold up the bar tip and tighten the bar knob by  
turning the knob clockwise. (33)  
When fitting a new chain, the chain tension has to be  
checked frequently until the chain is run-in. Check the  
chain tension regularly. A correctly tensioned chain  
ensures good cutting performance and long life. (44)  
WARNING! Always wear gloves, when  
working with the chain.  
!
445  
Check that the chain brake is in disengaged position by  
moving the front hand guard towards the front handle.  
(39)  
Fitting a spike bumper  
To t a spike bumper – contact your service agent. (47)  
Unscrew the bar nut and remove the clutch cover (chain  
brake). Take off the transportation ring (A). (40)  
Fit the bar over the bar bolt. Place the bar in its rearmost  
position. Place the chain over the drive sprocket and in  
the groove on the bar. Begin on the top side of the bar.  
(41)  
Make sure that the edges of the cutting links are facing  
forward on the top edge of the bar.  
Mount the clutch cover and remember to fit the chain  
adjuster pin in the hole in the bar. Check that the drive  
links of the chain fit correctly over the drive sprocket and  
that the chain is correctly located in the groove in the bar.  
Tighten the bar nut with your fingers.  
Tension the chain by turning the chain tensioning screw  
clockwise using the combination spanner. The chain  
should be tensioned until it does not sag from the  
underside of the bar. (42)  
The chain is correctly tensioned when there is no slack on  
the underside of the bar, and it can still be turned easily  
by hand.Tighten the bar nut with the combination spanner  
while holding up the tip of the bar. (43)  
When fitting a new chain, the chain tension has to be  
checked frequently until the chain is run-in. Check the  
chain tension regularly. A correctly tensioned chain  
ensures good cutting performance and long life. (44)  
445e, 450e  
Check that the chain brake is in disengaged position by  
moving the front hand guard towards the front handle.  
(45)  
Loosen the chain tensioner wheel and remove the clutch  
cover (chain brake). Remove the transport guard. (A) (46)  
Fit the bar over the bar bolts. Place the bar in its rearmost  
position. Place the chain over the drive sprocket locate it  
in the groove on the bar. Begin on the top edge of the bar.  
(41)  
Make sure that the edges of the cutting links are facing  
forward on the top edge of the bar.  
Mount the clutch cover and remember to fit the chain  
adjuster pin in the hole in the bar. Check that the drive  
links of the chain fit correctly over the drive sprocket and  
that the chain is correctly located in the groove in the bar.  
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FUEL HANDLING  
Two-stroke oil  
Fuel  
For best results and performance use HUSQVARNA  
two-stroke engine oil, which is specially formulated for  
our air-cooled two-stroke engines.  
Note! The machine is equipped with a two-stroke engine  
and must always be run using a mixture of petrol and two-  
stroke oil. It is important to accurately measure the  
amount of oil to be mixed to ensure that the correct  
mixture is obtained. When mixing small amounts of fuel,  
even small inaccuracies can drastically affect the ratio of  
the mixture.  
Never use two-stroke oil intended for water-cooled  
engines, sometimes referred to as outboard oil (rated  
TCW).  
Never use oil intended for four-stroke engines.  
A poor oil quality and/or too high oil/fuel ratio may  
jeopardise function and decrease the life time of  
catalytic converters.  
WARNING! Always ensure there is  
adequate ventilation when handling fuel.  
!
Mixing ratio  
1:50 (2%) with HUSQVARNA two-stroke oil.  
Petrol  
1:33 (3%) with oils class JASO FB or ISO EGB formulated  
for air-cooled, two-stroke engines.  
Petrol, litre  
Two-stroke oil, litre  
Use good quality unleaded or leaded petrol.  
2% (1:50)  
0,10  
3% (1:33)  
CAUTION! Engines equipped with catalytic  
converters must be run on unleaded fuel  
5
0,15  
0,30  
0,45  
0,60  
mixtures. Leaded gasoline will destroy the catalytic  
converter and it will no longer serve its purpose. The  
green fuel cap on saws fitted with catalytic converters  
means that only unleaded gasoline can be used.  
10  
15  
20  
0,20  
0,30  
0,40  
The lowest recommended octane grade is 90 (RON).  
If you run the engine on a lower octane grade than 90  
so-called knocking can occur.This gives rise to a high  
engine temperature and increased bearing load,  
which can result in serious engine damage.  
Mixing  
Always mix the petrol and oil in a clean container  
intended for fuel.  
Always start by filling half the amount of the petrol to  
be used. Then add the entire amount of oil. Mix  
(shake) the fuel mixture. Add the remaining amount of  
petrol.  
When working with continuous high revs (e.g.limbing)  
a higher octane is recommended.  
Environment fuel  
Mix (shake) the fuel mixture thoroughly before filling  
the machine’s fuel tank.  
HUSQVARNA recommends the use of alkylate fuel,  
either Aspen two-stroke fuel or environmental fuel for  
four-stroke engines blended with two-stroke oil as set out  
below. Note that carburettor adjustment may be  
necessary when changing the type of fuel (see the  
instructions under the heading Carburettor).  
Do not mix more than one month’s supply of fuel at a  
time.  
If the machine is not used for some time the fuel tank  
should be emptied and cleaned.  
Running-in  
Chain oil  
Avoid running at a too high speed for extended periods  
during the first 10 hours.  
We recommend the use of special oil (chain oil) with  
good adhesion characteristics. (48)  
Never use waste oil. This results in damage to the oil  
pump, the bar and the chain.  
It is important to use oil of the right grade (suitable  
viscosity range) to suit the air temperature.  
In temperatures below 0°C (32°F) some oils become  
too viscous.This can overload the oil pump and result  
in damage to the oil pump components.  
Contact your service agent when choosing chain oil.  
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FUEL HANDLING  
Fuelling  
WARNING! Never use a machine with  
visible damage to the spark plug guard  
and ignition cable. A risk of sparking  
arises, which can cause a fire.  
!
Transport and storage  
WARNING! Taking the following  
precautions, will lessen the risk of fire:  
Always store the chain saw and fuel so that there is no  
risk of leakages or fumes coming into contact with  
sparks or naked flames from electrical equipment,  
electric motors, relays/switches, boilers and the like.  
!
Do not smoke and do not place any hot  
objects in the vicinity of fuel.  
Always store fuel in an approved container designed  
for that purpose.  
Always stop the engine and let it cool for  
a few minutes before refuelling.  
For longer periods of storage or for transport of the  
chain saw, the fuel and chain oil tanks should be  
emptied.Ask where you can dispose of waste fuel and  
chain oil at your local petrol station.  
When refuelling, open the fuel cap slowly  
so that any excess pressure is released  
gently.  
The bar guard must always be fitted to the cutting  
attachment when the machine is being transported or  
in storage, in order to prevent accident contact with  
the sharp chain. Even a non-moving chain can cause  
serious cuts to yourself or persons you bump into with  
an exposed chain.  
Tighten the fuel cap carefully after  
refuelling.  
Always move the machine away from the  
refuelling area before starting.  
Remove the spark plug cap from the spark plug.  
Activate the chain brake.  
Clean the area around the fuel cap. Clean the fuel and  
chain oil tanks regularly. The fuel filter must be replaced  
at least once a year. Contamination in the tanks causes  
malfunction. Make sure the fuel is well mixed by shaking  
the container before refuelling.The capacities of the chain  
oil tank and fuel tank are carefully matched.You should  
therefore always fill the chain oil tank and fuel tank at the  
same time. (48)  
Secure the machine during transport.  
Long-term storage  
Empty the fuel/oil tanks in a well ventilated area.Store the  
fuel in approved cans in a safe place. Fit the bar guard.  
Clean the machine. See instructions under the heading  
Maintenance schedule.  
WARNING! Fuel and fuel vapour are  
Ensure the machine is cleaned and that a complete  
service is carried out before long-term storage.  
highly flammable.Take care when  
!
handling fuel and chain oil. Be aware of  
the risks of fire, explosion and those  
associated with inhalation.  
Fuel safety  
Never refuel the machine while the engine is running.  
Make sure there is plenty of ventilation when refuelling  
or mixing fuel (petrol and 2-stroke oil).  
Move the machine at least 3 m from the refuelling  
point before starting it.  
Never start the machine:  
1
If you have spilt fuel or chain oil on the machine.Wipe  
off the spillage and allow remaining fuel to evaporate.  
2
3
If you have spilt fuel on yourself or your clothes,  
change your clothes.Wash any part of your body that  
has come in contact with fuel. Use soap and water.  
If the machine is leaking fuel. Check regularly for  
leaks from the fuel cap and fuel lines.  
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English 19  
   
STARTING AND STOPPING  
Warm engine  
Starting and stopping  
Start position, 1: The correct choke/start throttle setting  
for warm starting is obtained by initially moving the choke  
control by pulling the red control outward - upwards. (50)  
Decompression valve (2): Press the valve to reduce the  
pressure in the cylinder and make starting easier. Once  
the machine has started the valve will automatically return  
to its original setting. (50)  
Air purge (3): Press the air purge diaphragm repeatedly  
until fuel fills the diaphragm (at least 6 times). The  
diaphragm need not be completely filled. (50)  
Push down the red choke control, 5: This inactivates  
the choke, which is not needed when starting a warm  
chain saw.However the movement of the start/stop switch  
will have engaged a high idle, making warm starting  
easier.  
WARNING! Note the following before  
starting:  
!
The chain brake must be engaged when  
the chain saw is started to reduce the  
chance of contact with the moving chain  
during starting.  
Never start a chain saw unless the bar,  
chain and all covers are fitted correctly.  
Otherwise the clutch can come loose and  
cause personal injuries.  
Place the machine on firm ground. Make  
sure you have a secure footing and that  
the chain cannot touch anything.  
Pull the starter handle, 6: Grip the front handle with your  
left hand. Hold the chain saw on the ground by placing  
your right foot through the rear handle. (51)  
Pull the starter handle with your right hand and pull out  
the starter cord slowly until you feel a resistance (as the  
starter pawls engage) then pull firmly and rapidly until the  
engine fires.  
Keep people and animals well away from  
the working area.  
Never twist the starter cord around your  
hand.  
As the chain brake is still engaged the speed of the  
engine must be set to idling as soon as possible, this is  
achieved by disengaging the throttle lock.  
Disengagement is done by gently touching on the throttle  
trigger. This prevents unnecessary wear to the clutch,  
clutch drum and brake band. Allow the machine to idle a  
few seconds before giving full throttle.  
Starting  
The chain brake must be engaged when the chain saw is  
started.Activate the brake by moving the front hand guard  
forwards. (49)  
Cold engine  
Start position, 1: Set the start/stop switch in the choke  
There is a simplified start reminder with illustrations to  
position by pulling the red control outward - upward. (50)  
describe each step on the rear edge of the saw (A). (50)  
CAUTION! Do not pull the starter cord all the way out and  
do not let go of the starter handle when the cord is fully  
extended. This can damage the machine.  
Decompression valve (2): Press the valve to reduce the  
pressure in the cylinder and make starting easier. Once  
the machine has started the valve will automatically return  
to its original setting. (50)  
Note! Reactivate the chain brake by pushing the front  
hand guard back towards the front handle. The chain  
saw is now ready for use.  
Air purge (3): Press the air purge diaphragm repeatedly  
until fuel fills the diaphragm (at least 6 times). The  
diaphragm need not be completely filled. (50)  
Grip the front handle with your left hand. Hold the chain  
saw on the ground by placing your right foot through the  
rear handle. (51)  
Pull the starter handle, 4: Pull the starter handle with  
your right hand and pull out the starter cord slowly until  
you feel a resistance (as the starter pawls engage) then  
pull firmly and rapidly until the engine fires.  
WARNING! Long term inhalation of the  
engine’s exhaust fumes, chain oil mist  
!
and dust from sawdust can represent a  
health risk.  
Push down the red choke control, 5: As soon as the  
engine fires which can be heard through a "puff" sound,  
push down on the red choke control.  
Pull the starter handle (6): Keep on pulling the cord  
powerfully until the engine starts.  
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STARTING AND STOPPING  
Never start a chain saw unless the bar, chain and all  
covers are fitted correctly. See instructions under the  
heading Assembly. Without a bar and chain attached  
to the chain saw the clutch can come loose and cause  
serious injury.  
The chain brake should be activated when starting.  
Se instructions under the heading Start and stop. Do  
not drop start. This method is very dangerous  
because you may lose control of the saw. (52)  
Never start the machine indoors. Exhaust fumes can  
be dangerous if inhaled.  
Observe your surroundings and make sure that there  
is no risk of people or animals coming into contact  
with the cutting equipment.  
Always hold the saw with both hands. The right hand  
should be on the rear handle, and the left hand on the  
front handle. All people, whether right or left handed,  
should use this grip. Use a firm grip with thumbs and  
fingers encircling the chain saw handles.  
Stopping  
Stop the engine by pushing the start/stop switch down.  
(53)  
CAUTION! The start/stop switch automatically returns to  
run position. To avoid involuntary start up, the spark plug  
cap must always be removed from the spark plug when  
the machine is unsupervised. (54)  
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WORKING TECHNIQUES  
4
Make sure you can move and stand safely. Check the  
Before use: (55)  
area around you for possible obstacles (roots, rocks,  
branches, ditches, etc.) in case you have to move  
suddenly. Take great care when working on sloping  
ground.  
1
Check that the chain brake works correctly and is not  
damaged.  
Check that the rear right hand guard is not damaged.  
Check that the throttle lockout works correctly and is  
not damaged.  
Check that the stop switch works correctly and is not  
damaged.  
Check that all handles are free from oil.  
Check that the anti vibration system works and is not  
damaged.  
2
3
5
Take great care when cutting a tree that is in tension.  
A tree that is in tension may spring back to its normal  
position before or after being cut. If you position  
yourself incorrectly or make the cut in the wrong place  
the tree may hit you or the machine and cause you to  
lose control. Both situations can cause serious  
personal injury.  
4
5
6
7
8
9
Check that the muffler is securely attached and not  
damaged.  
Check that all parts of the chain saw are tightened  
correctly and that they are not damaged or missing.  
Check that the chain catcher is in place and not  
damaged.  
6
7
Before moving your chain saw switch off the engine  
and lock the chain using the chain brake. Carry the  
chain saw with the bar and chain pointing backwards.  
Fit a guard to the bar before transporting the chain  
saw or carrying it for any distance.  
10 Check the chain tension.  
General working instructions  
When you put the chain saw on the ground, lock the  
saw chain using the chain brake and ensure you have  
a constant view of the machine. Switch the engine off  
before leaving your chain saw for any length of time.  
IMPORTANT!  
This section describes basic safety rules for using a  
chain saw. This information is never a substitute for  
professional skills and experience. If you get into a  
situation where you feel unsafe, stop and seek expert  
advice. Contact your chain saw dealer, service agent or  
an experienced chain saw user. Do not attempt any task  
that you feel unsure of!  
WARNING! Sometimes chips get stuck in  
the clutch cover causing the chain to  
!
jam. Always stop the engine before  
cleaning.  
Before using a chain saw you must understand the  
effects of kickback and how to avoid them. See  
instructions under the heading How to avoid kickback.  
General rules  
1
If you understand what kickback is and how it happens  
then you can reduce or eliminate the element of  
surprise. By being prepared you reduce the risk.  
Kickback is usually quite mild, but it can sometimes be  
very sudden and violent.  
Before using a chain saw you must understand the  
difference between cutting with the top and bottom  
edges of the bar. See instructions under the headings  
How to avoid kickback and Machine’s safety equipment.  
Wear personal protective equipment. See instructions  
under the heading ”Personal protective equipment”.  
2
Always hold the chain saw firmly with your right hand  
on the rear handle and your left hand on the front  
handle. Wrap your fingers and thumbs around the  
handles.You should use this grip whether you are  
right-handed or left-handed. This grip minimises the  
effect of kickback and lets you keep the chain saw  
under control. Do not let go of the handles! (56)  
Most kickback accidents happen during limbing.Make  
sure you are standing firmly and that there is nothing  
in the way that might make you trip or lose your  
balance.  
Basic safety rules  
1
Look around you:  
To ensure that people, animals or other things cannot  
affect your control of the machine.  
To make sure that none of the above might come  
within reach of your saw or be injured by falling trees.  
3
CAUTION! Follow the instructions above, but do not use a  
chain saw in a situation where you cannot call for help in  
case of an accident.  
Lack of concentration can lead to kickback if the  
kickback zone of the bar accidentally touches a  
branch, nearby tree or some other object.  
2
Do not use the machine in bad weather, such as  
dense fog, heavy rain, strong wind, intense cold, etc.  
Working in bad weather is tiring and often brings  
added risks, such as icy ground, unpredictable felling  
direction, etc.  
Have control over the workpiece. If the pieces you  
intend to cut are small and light, they can jam in the  
saw chain and be thrown towards you. Even if this  
does not need to be a danger, you may be surprised  
and lose control of the saw. Never saw stacked logs or  
branches without first separating them. Only saw one  
log or one piece at a time. Remove the cut pieces to  
keep your working area safe. (57)  
3
Take great care when removing small branches and  
avoid cutting bushes (i.e.cutting many small branches  
at the same time). Small branches can be grabbed by  
the chain and thrown back at you, causing serious  
injury.  
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WORKING TECHNIQUES  
4
5
Never use the chain saw above shoulder height  
There are five important factors you should consider  
before making a cut:  
and try not to cut with the tip of the bar. Never use  
the chain saw one-handed! (58)  
1
Make sure the cutting equipment will not jam in the  
cut. (63)  
You must have a steady stance in order to have full  
control over the chain saw. Never work standing on a  
ladder, in a tree or where you do not have firm ground  
to stand on. (59)  
2
3
Make sure the object you are cutting will not split. (64)  
Make sure the chain will not strike the ground or any  
other object during or after cutting. (65)  
Is there a risk of kickback? (4)  
4
5
6
7
Always use a fast cutting speed, i.e. full throttle.  
Do the conditions and surrounding terrain affect how  
safely you can stand and move about?  
Take great care when you cut with the top edge of the  
bar, i.e. when cutting from the underside of the object.  
This is known as cutting on the push stroke.The chain  
tries to push the chain saw back towards the user. If  
the saw chain is jamming, the saw may be pushed  
back at you. (60)  
Two factors decide whether the chain will jam or the object  
that you are cutting will split: the first is how the object is  
supported before and after cutting, and the second is  
whether it is in tension.  
In most cases you can avoid these problems by cutting in  
two stages; from the top and from the bottom.You need to  
support the object so that it will not trap the chain or split  
during cutting.  
8
Unless the user resists this pushing force there is a  
risk that the chain saw will move so far backwards that  
only the kickback zone of the bar is in contact with the  
tree, which will lead to a kickback. (61)  
Cutting with the bottom edge of the bar, i.e. from the  
top of the object downwards, is known as cutting on  
the pull stroke. In this case the chain saw pulls itself  
towards the tree and the front edge of the chain saw  
body rests naturally on the trunk when cutting. Cutting  
on the pull stroke gives the operator better control  
over the chain saw and the position of the kickback  
zone. (62)  
Follow the instructions on sharpening and maintaining  
your bar and chain. When you replace the bar and  
chain use only combinations that are recommended  
by us. See instructions under the headings Cutting  
equipment and Technical data.  
IMPORTANT! If the chain jams in the cut: stop the  
engine! Don’t try to pull the chain saw free. If you do you  
may be injured by the chain when the chain saw  
suddenly breaks free.Use a lever to open up the cut and  
free the chain saw.  
The following instructions describe how to handle the  
commonest situations you are likely to encounter when  
using a chain saw.  
9
Limbing  
When limbing thick branches you should use the same  
approach as for cutting.  
Cut difficult branches piece by piece. (66)  
Cutting  
Basic cutting technique  
WARNING! Never use a chain saw by  
WARNING! Never attempt to cut logs  
holding it with one hand. A chain saw is  
not safely controlled with one hand.  
Always have a secure, firm grip around  
the handles with both hands.  
!
while they are in a pile or when a couple  
!
of logs are lying together. Such  
procedures drastically increase the risk  
of kickback which can result in a serious  
or fatal injury.  
General  
Always use full throttle when cutting!  
If you have a pile of logs, each log you attempt to cut  
should be removed from the pile, placed on a saw horse  
or runners and cut individually.  
Reduce the speed to idle after every cut (running the  
engine for too long at full throttle without any load, i.e.  
without any resistance from the chain during cutting,  
can lead to serious engine damage).  
Remove the cut pieces from the cutting area. By leaving  
them in the cutting area, you increase the risk for  
inadvertently getting a kickback, as well as increasing the  
risk of losing your balance while working. (67)  
The log is lying on the ground. There is little risk of the  
chain jamming or the object splitting. However there is a  
risk that the chain will touch the ground when you finish  
the cut. (68)  
Cut all the way through the log from above. Avoid letting  
the chain touch the ground as you finish the cut. Maintain  
full throttle but be prepared for what might happen. (69)  
If it is possible (can you turn the log?) stop cutting about  
2/3 of the way through the log.  
Cutting from above = Cutting on the pull stroke.  
Cutting from below = Cutting on the push stroke.  
Cutting on the push stroke increases the risk of kickback.  
See instructions under the heading How to avoid  
kickback.  
Terms  
Cutting = General term for cutting through wood.  
Limbing = Cutting branches off a felled tree.  
Splitting = When the object you are cutting breaks off  
before the cut is complete.  
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WORKING TECHNIQUES  
Turn the log and finish the cut from the opposite side. (70)  
Clearing the trunk and preparing your retreat  
Delimb the stem up to shoulder height. It is safer to work  
from the top down and to have the tree between you and  
the saw. (77)  
The log is supported at one end. There is a high risk  
that it will split. (71)  
Start by cutting from below (about 1/3 of the way through).  
Finish by cutting from above so that the two cuts meet.  
Remove any undergrowth from the base of the tree and  
check the area for obstacles (stones, branches, holes,  
etc.) so that you have a clear path of retreat when the tree  
starts to fall.Your path of retreat should be roughly 135  
degrees away from the intended felling direction. (78)  
(72)  
The log is supported at both ends. There is a high risk  
that the chain will jam. (73)  
Start by cutting from above (about 1/3 of the way through).  
1
2
3
Danger zone  
Retreat path  
Felling direction  
Finish by cutting from below so that the two cuts meet. (74)  
Tree felling technique  
Felling  
IMPORTANT! It takes a lot of experience to fell a tree.  
Inexperienced users of chain saws should not fell trees.  
Do not attempt any task that you feel unsure of!  
WARNING! Unless you have special  
training we advise you not to fell trees  
with a diameter larger than the bar length  
of your saw!  
!
Safe distance  
The safe distance between a tree that is to be felled and  
anyone else working nearby is at least 2 1/2 tree lengths.  
Make sure that no-one else is in this ”risk zone” before or  
during felling. (75)  
Felling is done using three cuts. First you make the  
directional cuts, which consist of the top cut and the  
bottom cut, then you finish with the felling cut. By placing  
these cuts correctly you can control the felling direction  
very accurately.  
Felling direction  
The aim is to fell the tree in a position where you can limb  
and cross-cut the log as easily as possible.You want it to  
fall in a location where you can stand and move about  
safely.  
Directional cuts  
To make the directional cut you begin with the top cut.Aim  
using to the saw’s felling direction mark (1) toward a goal  
further forward in the terrain, where you would like the tree  
to fall (2). Stand on the right-hand side of the tree, behind  
the saw, and cut with a pull stroke.  
Once you have decided which way you want the tree to fall  
you must judge which way the tree would fall naturally.  
Several factors affect this:  
Next make the bottom cut so that it finishes exactly at the  
end of the top cut. (79)  
The directional cuts should run 1/4 of the diameter  
through the trunk and the angle between the top cut and  
bottom cut should be 45°.  
Lean of the tree  
Bend  
Wind direction  
Arrangement of branches  
Weight of snow  
The line where the two cuts meet is called the directional  
cut line. This line should be perfectly horizontal and at  
right angles (90°) to the chosen felling direction. (80)  
Felling cut  
The felling cut is made from the opposite side of the tree  
and it must be perfectly horizontal. Stand on the left side  
of the tree and cut on the pull stroke.  
Obstacles within the reach of the tree: for example,  
other trees, power lines, roads and buildings.  
Look for signs of damage and rot in the stem, this  
makes it more probably that the tree will break and  
start to fall before you expect it to.  
You may find you are forced to let the tree fall in its natural  
direction because it is impossible or dangerous to try to  
make it fall in the direction you first intended.  
Make the felling cut about 3-5 cm (1.5-2 inches) above the  
Another very important factor, which does not affect the  
felling direction but does affect your safety, is to make sure  
the tree has no damaged or dead branches that might  
break off and hit you during felling.  
The main point to avoid is letting the tree fall onto another  
tree. It is very dangerous to remove a trapped tree and  
there is high accident risk. See instructions under the  
heading Freeing a tree that has fallen badly. (76)  
bottom directional cut. (81)  
Set the spike bumper (if one is fitted) just behind the  
felling hinge. Use full throttle and advance the chain/bar  
slowly into the tree. Make sure the tree does not start to  
move in the opposite direction to your intended felling  
direction. Drive a wedge or breaking bar into the cut as  
soon as it is deep enough.  
Finish the felling cut parallel with the directional cut line so  
that the distance between them is at least 1/10 of the  
trunk diameter.The uncut section of the trunk is called the  
felling hinge.  
IMPORTANT! During critical felling operations, hearing  
protectors should be lifted immediately when sawing is  
completed so that sounds and warning signals can be  
heard.  
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WORKING TECHNIQUES  
The felling hinge controls the direction that the tree falls in.  
(82)  
How to avoid kickback  
All control over the felling direction is lost if the felling  
hinge is too narrow or non-existent, or if the directional  
cuts and felling cut are badly placed. (83)  
When the felling cut and directional cut are complete the  
tree should start to fall by itself or with the aid of a felling  
wedge or breaking bar. (84)  
We recommend that you use a bar that is longer than the  
diameter of the tree, so that you can make the felling cut  
and directional cuts with single cutting strokes. See  
instructions under the heading Technical data section to  
find out which lengths of bar are recommended for your  
saw.  
WARNING! Kickback can happen very  
suddenly and violently; kicking the chain  
saw, bar and chain back at the user. If  
this happens when the chain is moving it  
can cause very serious, even fatal  
injuries. It is vital you understand what  
causes kickback and that you can avoid  
it by taking care and using the right  
working technique.  
!
What is kickback?  
The word kickback is used to describe the sudden  
reaction that causes the chain saw and bar to jump off an  
object when the upper quadrant of the tip of the bar,  
known as the kickback zone, touches an object. (61)  
There are methods for felling trees with a diameter larger  
than the bar length. However these methods involve a  
much greater risk that the kickback zone of the bar will  
come into contact with the tree. (4)  
Kickback always occurs in the cutting plane of the bar.  
Normally the chain saw and bar are thrown backwards  
and upwards towards the user. However, the chain saw  
may move in a different direction depending on the way it  
was being used when the kickback zone of the bar  
touched the object. (7)  
Kickback only occurs if the kickback zone of the bar  
touches an object. (4)  
Limbing  
Freeing a tree that has fallen badly  
Freeing a ”trapped tree”  
It is very dangerous to remove a trapped tree and there is  
high accident risk.  
Never try to fell the tree that is trapped.  
Never work in the risk zone of the hanging trapped tree.  
(85)  
The safest method is to use a winch.  
WARNING! A majority of kickback  
accidents occur during limbing. Do not  
Tractor-mounted  
Portable  
!
use the kickback zone of the guide bar.  
Be extremely cautious and avoid  
contacting the log, other limbs or objects  
with the nose of the guide bar. Be  
extremely cautious of limbs under  
tension.They can spring back toward  
you and cause loss of control resulting  
in injury.  
Cutting trees and branches that are in tension  
Preparations:Work out which side is in tension and where  
the point of maximum tension is (i.e. where it would break  
if it was bent even more). (86)  
Decide which is the safest way to release the tension and  
whether you are able to do it safely. In complicated  
situations the only safe method is to put aside your chain  
saw and use a winch.  
Make sure that you can stand and move about safely.  
Work on the left side of the trunk. Work as close as  
possible to the chain saw for maximum control.If possible,  
let the weight of the chain saw rest on the trunk.  
General advice:  
Position yourself so that you will be clear of the tree or  
branch when the tension is released. (87)  
Make one or more cuts at or near the point of maximum  
tension. Make as many cuts of sufficient depth as  
necessary to reduce the tension and make the tree or  
branch break at the point of maximum tension. (88)  
Keep the trunk between you and the chain saw as you  
move along the trunk.  
Cutting the trunk into logs  
See instructions under the heading Basic cutting  
technique.  
Never cut straight through a tree or branch that is in  
tension!  
If you must cut across tree/limb, make two to three cuts,  
one inch apart, one to two inches deep. (89)  
Continue to cut deeper until tree/limb bends and tension  
is released. (90)  
Cut tree/limb from outside the bend, after tension has  
been released.  
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MAINTENANCE  
General  
Checking, maintaining and  
servicing chain saw safety  
The user must only carry out the maintenance and  
service work described in this Operator’s Manual. More  
extensive work must be carried out by an authorized  
service workshop.  
equipment  
Note! All service and repair work on the machine  
demands special training. This is especially true of the  
machine’s safety equipment. If your machine fails any of  
the checks described below we recommend that you  
take it to your service workshop.  
Carburettor adjustment  
Your Husqvarna product has been designed and  
manufactured to specifications that reduce harmful  
emissions.  
Function  
Chain brake and front hand guard  
Checking brake band wear  
The carburettor governs the engine’s speed via the  
throttle control. Air and fuel are mixed in the  
carburettor.The air/fuel mixture is adjustable. Correct  
adjustment is essential to get the best performance  
from the machine.  
Brush off any wood dust, resin and dirt from the chain  
brake and clutch drum. Dirt and wear can impair  
operation of the brake. (91)  
Regularly check that the brake band is at least 0.6 mm  
thick at its thinnest point.  
The T-screw regulates the throttle setting at idle  
speed. If the T-screw is turned clockwise this gives a  
higher idle speed; turning it anti-clockwise gives a  
lower idle speed.  
Basic settings and running in  
Checking the front hand guard  
The basic carburettor settings are adjusted during testing  
at the factory. Fine adjustment should be carried out by a  
skilled technician.  
Rec. idle speed: See the Technical data section.  
Make sure the front hand guard is not damaged and that  
there are no visible defects such as cracks.  
Fine adjustment of the idle speed T  
Move the front hand guard forwards and back to make  
sure it moves freely and that it is securely anchored to the  
clutch cover.  
Adjust the idle speed with the T-screw. If it is necessary to  
re-adjust, turn the T-screw clockwise while the engine is  
running, until the chain starts to rotate. Then turn anti-  
clockwise until the chain stops. When the idle speed is  
correctly adjusted the engine should run smoothly in  
every position and the engine speed should be safely  
below the speed at which the chain starts to rotate.  
Checking the inertia brake release  
WARNING! Contact your servicing  
Place the chain saw, with the engine switched off, on a  
stump or other stable surface. Release the front handle  
and let the saw fall by its own weight, rotating around the  
rear handle towards the stump. (92)  
dealer, if the idle speed setting cannot be  
!
adjusted so that the chain stops. Do not  
use the chain saw until it has been  
properly adjusted or repaired.  
When the bar hits the stump the brake should be  
applied. (93)  
Correctly adjusted carburettor  
Checking the brake trigger  
When the carburettor is correctly adjusted the machine  
accelerates without hesitation and 4-cycles a little at full  
throttle. It is also important that the chain does not rotate  
at idle. If the L-jet is set too lean it may cause starting  
difficulties and poor acceleration. If the H-jet is set too  
lean the machine will have less power, poor acceleration  
and could suffer damage to the engine.  
Place the chain saw on firm ground and start it.Make sure  
the chain does not touch the ground or any other object.  
See the instructions under the heading Start and stop.  
(94)  
Grasp the chain saw firmly, wrapping your fingers and  
thumbs around the handles. (56)  
Apply full throttle and activate the chain brake by tilting  
your left wrist forward onto the front hand guard. Do not  
let go of the front handle. The chain should stop  
immediately. (52)  
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MAINTENANCE  
Throttle lockout  
Muffler  
Never use a machine that has a faulty muffler.  
Make sure the throttle control is locked at the idle  
setting when the throttle lockout is released. (95)  
Press the throttle lockout and make sure it returns to  
Regularly check that the muffler is securely attached to  
the machine. (100)  
Some mufflers are equipped with a special spark arrestor  
mesh. If your machine has this type of muffler, you should  
clean the mesh at least once a week. This is best done  
with a wire brush. A blocked mesh will cause the engine  
to overheat and may lead to serious damage.  
its original position when you release it. (96)  
Check that the throttle control and throttle lockout  
move freely and that the return springs work properly.  
(97)  
Start the chain saw and apply full throttle. Release the  
throttle control and check that the chain stops and  
remains stationary. If the chain rotates when the  
throttle control is in the idle position you should check  
the carburettor idle adjustment.  
Note! The mesh must be replaced if it is damaged. If the  
mesh is blocked the machine will overheat and this will  
cause damage to the cylinder and piston. Never use a  
machine with a muffler that is in poor condition. Never  
use a muffler if the spark arrestor mesh is missing or  
defective. (13)  
The muffler is designed to reduce the noise level and to  
direct the exhaust gases away from the operator. The  
exhaust gases are hot and can contain sparks, which may  
cause fire if directed against dry and combustible  
material.  
Chain catcher  
Check that the chain catcher is not damaged and is firmly  
attached to the body of the chain saw. (98)  
Starter  
Right hand guard  
WARNING! When the recoil spring is  
wound up in the starter housing it is  
!
under tension and can, if handled  
carelessly, pop out and cause personal  
injury.  
Check that the right hand guard is not damaged and that  
there are no visible defects, such as cracks. (11)  
Care must be exercised when replacing  
the return spring or the starter cord.  
Wear protective glasses and protective  
gloves.  
Vibration damping system  
Replacing the starter cord  
Regularly check the vibration damping units for cracks or  
deformation. Make sure the vibration damping units are  
securely attached to the engine unit and handle unit. (99)  
Stop switch  
Loosen the screws that hold the starter against the  
crankcase and remove the starter. (101)  
Pull out the cord approx. 30 cm and hook it into the  
notch in the rim of the pulley. Release the recoil spring  
by letting the pulley rotate slowly backwards. (102)  
Undo the bolt in the centre of the pulley and remove  
the drive disc (A), drive disc spring (B) and the pulley  
(C). Insert and secure a new starter cord in the starter  
pulley. Wind approx. 3 turns of the starter cord on the  
starter pulley. Fit the starter pulley so that the end of  
the recoil spring (D) hooks into the starter pulley. Now  
assemble the drive disc spring, drive disc and the bolt  
in the centre of the pulley. Carry the starter cord  
through the hole in the starter housing and the starter  
handle. Tie a good knot on the starter cord. (103)  
Start the engine and make sure the engine stops when  
you move the stop switch to the stop setting. (53)  
CAUTION! The start/stop switch automatically returns to  
run position. In order to prevent unintentional starting, the  
spark plug cap must be removed from the spark plug  
when assembling, checking and/or performing  
maintenance.  
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MAINTENANCE  
The filter can be cleaned more thoroughly by washing it in  
Tensioning the recoil spring  
water and detergent.  
Hook the starter cord in the notch in the pulley and  
turn the starter pulley about 2 turns clockwise.  
An air filter that has been in use for a long time cannot be  
cleaned completely.The filter must therefore be replaced  
with a new one at regular intervals. A damaged air filter  
must always be replaced.  
Note! Check that the pulley can be turned at least a  
further 1/2 turn when the starter cord is pulled all the  
way out. (104)  
A HUSQVARNA chain saw can be equipped with different  
types of air filter according to working conditions, weather,  
season, etc. Contact your dealer for advice.  
Stretch the line with the handle. Move your thumb and  
release the line. See the figure below. (105)  
Replacing the return and drive springs  
Spark plug  
Recoil spring (A)  
The spark plug condition is influenced by:  
Lift up the starter pulley. See instructions under the  
heading Changing a broken or worn starter cord.  
Remember that the recoil spring is coiled under  
tension in the starter housing.  
Incorrect carburettor adjustment.  
An incorrect fuel mixture (too much or incorrect type  
of oil).  
Remove the cassette with the recoil spring from the  
starter.  
A dirty air filter.  
These factors cause deposits on the spark plug  
electrodes, which may result in operating problems and  
starting difficulties.  
Lubricate the recoil spring with light oil. Fit the  
cassette with recoil spring in the starter. Fit the starter  
pulley and tension the recoil spring.  
If the machine is low on power, difficult to start or runs  
poorly at idle speed: always check the spark plug first  
before taking any further action. If the spark plug is dirty,  
clean it and check that the electrode gap is 0.5 mm. The  
spark plug should be replaced after about a month in  
operation or earlier if necessary. (108)  
Note! Always use the recommended spark plug type! Use  
of the wrong spark plug can damage the piston/cylinder.  
Check that the spark plug is fitted with a suppressor.  
Drive disc spring (B)  
Undo the bolt in the centre of the pulley and remove  
the drive disc and the drive disc spring.  
Replace the drive disc spring and fit the drive disc  
above the spring. (106)  
Fitting the starter  
To t the starter, first pull out the starter cord and place  
the starter in position against the crankcase. Then  
slowly release the starter cord so that the pulley  
engages with the pawls.  
Lubricating the bar tip sprocket  
Fit and tighten the screws that hold the starter.  
Air filter  
Lubricate the bar tip sprocket each time you refuel. Use  
the special grease gun and a good quality bearing grease.  
(109)  
Needle bearing lubrication  
The air filter must be regularly cleaned to remove dust  
and dirt in order to avoid:  
Carburettor malfunctions  
Starting problems  
The clutch drum has a needle bearing on the output shaft.  
This needle bearing must be lubricated regularly.  
Loss of engine power  
When lubricating, remove the clutch cover by loosening  
the two bar nuts. Lay the saw on its side with the clutch  
drum upwards.  
Unnecessary wear to engine parts.  
Excessive fuel consumption.  
Remove the air filter after taking off the air filter cover.  
When refitting make sure that the air filter seals tightly  
against the filter holder. Clean the filter by brushing or  
shaking it. (107)  
Lubrication involves engine oil dripping into the centre of  
the clutch drum as it rotates. (110)  
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MAINTENANCE  
Cooling system  
Winter use  
Running problems can occur when using the machine in  
the cold and snowy conditions caused by:  
Too low engine temperature.  
To keep the working temperature as low as possible the  
machine is equipped with a cooling system.  
Icing of the air filter and carburettor.  
Special measures are therefore often required:  
The cooling system consists of:  
Partly mask the air inlet on the starter to increase the  
working temperature of the engine.  
1
2
3
4
5
Air intake on the starter.  
Air guide plate.  
Temperature -5°C or colder:  
Fins on the flywheel.  
Cooling fins on the cylinder.  
Cylinder cover (directs cold air over the cylinder).  
(111)  
For running the machine in cold weather or powder snow,  
a special cover is available, which is mounted on the  
starter housing. This reduces the intake of cold air and  
prevents large amounts of snow from being sucked in.  
(113)  
Clean the cooling system with a brush once a week, more  
often in demanding conditions. A dirty or blocked cooling  
system results in the machine overheating which causes  
damage to the piston and cylinder.  
Air Injection” centrifugal  
CAUTION! If the special winterising kit has been fitted or  
any measures have been taken to increase the  
temperature these changes must be reversed before the  
machine is used in normal temperature conditions.  
Otherwise there is a risk of overheating, resulting in  
severe damage to the engine.  
cleaning  
Centrifugal cleaning means the following: All air to the  
carburettor passes through the starter. Dirt and dust is  
centrifuged out by the cooling fan. (112)  
IMPORTANT! In order to maintain operation of the  
centrifugal cleaning system it must be regularly  
maintained. Clean the air intake to the starter, the fins on  
the flywheel, the space around the flywheel, inlet pipe and  
carburettor compartment.  
IMPORTANT! Any maintenance other than that described  
in this manual must be carried out by your servicing  
dealer (retailer).  
1153136-26 Rev.1 2009-12-29  
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MAINTENANCE  
Maintenance schedule  
The following is a list of the maintenance that must be performed on the machine. Most of the items are described in the  
Maintenance section.  
Daily maintenance  
Weekly maintenance  
Monthly maintenance  
Check the brake band on the chain  
brake for wear. Replace when less  
than 0.6 mm (0,024 inch) remains at  
the most worn point.  
On chain saws without a catalytic  
converter, check the cooling system  
weekly.  
Clean the outside of the machine.  
Check that the components of the  
throttle control work safely. (Throttle  
lockout and throttle control.)  
Check the starter, starter cord and  
return spring.  
Check the clutch centre, clutch drum  
and clutch spring for wear.  
Clean the chain brake and check that  
it operates safely. Make sure that the Check that the vibration damping  
Clean the spark plug. Check that the  
electrode gap is 0.5 mm.  
chain catcher is undamaged, and  
replace it if necessary.  
elements are not damaged.  
The bar should be turned regularly for  
more even wear. Check the  
lubrication hole in the bar, to be sure it  
is not clogged. Clean the bar groove.  
If the bar has a sprocket tip, this  
should be lubricated.  
Lubricate the clutch drum bearing.  
Clean the outside of the carburettor.  
Check that the bar and chain are  
getting sufficient oil.  
File off any burrs from the edges of  
the bar.  
Check the fuel filter and the fuel hose.  
Replace if necessary.  
Check the saw chain with regard to  
visible cracks in the rivets and links,  
whether the saw chain is stiff or  
whether the rivets and links are  
abnormally worn. Replace if  
necessary.  
Clean or replace the spark arrestor  
mesh on the muffler.  
Empty the fuel tank and clean the  
inside.  
Sharpen the chain and check its  
tension and condition. Check the  
drive sprocket for excessive wear and  
replace if necessary.  
Empty the oil tank and clean the  
inside.  
Clean the carburettor compartment.  
Clean the air filter. Replace if  
necessary.  
Clean the starter units air intake.  
Check all cables and connections.  
Check that nuts and screws are tight.  
Check that the stop switch works  
correctly.  
Check that there are no fuel leaks  
from the engine, tank or fuel lines.  
On chain saws with a catalytic  
converter, check the cooling system  
daily.  
30 – English  
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TECHNICAL DATA  
Technical data  
445  
445e  
450e  
Engine  
Cylinder displacement, cm3  
Cylinder bore, mm  
Stroke, mm  
45,7  
42  
45,7  
42  
50,2  
44  
33  
33  
33  
Idle speed, rpm  
Power, kW/ rpm  
Ignition system  
Spark plug  
2700  
2,1/9000  
2700  
2,1/9000  
2700  
2,4/9000  
NGK BPMR 7A/  
NGK BPMR 7A/  
NGK BPMR 7A/  
Champion RCJ 7Y/  
Husqvarna PR 17Y  
Champion RCJ 7Y/  
Husqvarna PR 17Y  
Champion RCJ 7Y/  
Husqvarna PR 17Y  
Electrode gap, mm  
0,5  
0,5  
0,5  
Fuel and lubrication system  
Fuel tank capacity, litre  
Oil pump capacity at 9,000 rpm, ml/min  
Oil tank capacity, litre  
Type of oil pump  
0,45  
0,45  
0,45  
13  
13  
13  
0,26  
0,26  
0,26  
Not adjustable  
Not adjustable  
Not adjustable  
Weight  
Chain saw without bar or chain, empty tanks, kg 4,9  
5,1  
5,1  
Noise emissions  
(see note 1)  
Sound power level, measured dB(A)  
Sound power level, guaranteed LWA dB(A)  
Sound levels  
112  
114  
112  
114  
113  
115  
(see note 2)  
Equivalent sound pressure level at the operator’s  
ear, dB(A)  
103  
103  
104  
Vibration levels  
(see note 3)  
Front handle, m/s2  
Rear handle, m/s2  
1,9  
2,6  
1,9  
2,6  
2,3  
2,7  
Chain/bar  
Standard bar length, inch/cm  
Recommended bar lengths, inch/cm  
Usable cutting length, inch/cm  
Pitch, inch/mm  
13"/33  
13"/33  
13"/33  
13-20/33-50  
12-19/31-49  
0,325/8,25  
13-20/33-50  
12-19/31-49  
0,325/8,25  
13-20/33-50  
12-19/31-49  
0,325/8,25  
Thickness of drive links, inch/mm  
Type of drive sprocket/number of teeth  
Chain speed at max. power, m/sec  
0,058/1,5, 0,050/1,3 0,058/1,5, 0,050/1,3 0,058/1,5, 0,050/1,3  
Spur/7  
17,3  
Spur/7  
17,3  
Spur/7  
17,3  
Note 1: Noise emissions in the environment measured as sound power (LWA) in conformity with EC directive 2000/14/  
EC.  
Note 2: Equivalent sound pressure level, according to ISO 22868, is calculated as the time-weighted energy total for  
different sound pressure levels under various working conditions. Typical statistical dispersion for equivalent sound  
pressure level is a standard deviation of 1 dB (A).  
Note 3: Equivalent vibration level, according to ISO 22867, is calculated as the time-weighted energy total for vibration  
levels under various working conditions. Reported data for equivalent vibration level has a typical statistical dispersion  
(standard deviation) of 1 m/s2.  
31 – English  
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TECHNICAL DATA  
Bar and chain combinations  
The following cutting attachments are approved for the models Husqvarna 445, 445e and 450e.  
Bar  
Chain  
Length, inch Pitch, inch  
Gauge, mm  
Max. nose radius Type  
Length, drive links (no.)  
13  
15  
16  
18  
20  
13  
15  
16  
18  
20  
0,325  
0,325  
0,325  
0,325  
0,325  
0,325  
0,325  
0,325  
0,325  
0,325  
10T  
56  
64  
66  
72  
78  
56  
64  
66  
72  
78  
10T  
1,3  
1,5  
10T  
10T  
10T  
10T  
10T  
10T  
10T  
12T  
Husqvarna H30  
Husqvarna H25  
Saw chain filing and file gauges  
32 – English  
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TECHNICAL DATA  
EC-declaration of conformity (Applies to Europe only)  
Husqvarna AB, SE-561 82 Huskvarna, Sweden, tel: +46-36-146500, declares under sole responsibility that the chain  
saws for forest service Husqvarna 445, 445e and 450e from 2009’s serial numbers and onwards (the year is clearly  
stated in plain text on the type plate with subsequent serial number), are in conformity with the requirements of the  
COUNCILS DIRECTIVES:  
- of May 17, 2006 "relating to machinery" 2006/42/EC  
- of December 15, 2004 ”relating to electromagnetic compatibility” 2004/108/EC.  
- of May 8, 2000 ”relating to the noise emissions in the environment” 2000/14/EC.  
For information relating to noise emissions, see the chapter Technical data.The following standards have been applied:  
EN ISO 12100-2:2003, CISPR 12:2005, EN ISO 11681-1:2004  
Notified body: 0404, SMP Svensk Maskinprovning AB, Fyrisborgsgatan 3, SE-754 50 Uppsala, Sweden, has carried out  
EC type examination in accordance with the machinery directive’s (2006/42/EC) article 12, point 3b.The certificates for EC  
type examination in accordance with annex VI, have the numbers: 0404/09/2161 - 445, 445e, 0404/09/2162 - 450e.  
In addition, SMP, Svensk Maskinprovning AB, Fyrisborgsgatan 3, SE-754 50 Uppsala, Sweden, has certified conformity  
with annex V of the Council’s Directive of May 8, 2000 ”relating to the noise emissions in the environment” 2000/14/EC.  
The certificates have the numbers: 01/161/068 - 445, 445e, 01/161/067 - 450e.  
The supplied chain saw conforms to the example that underwent EC type examination.  
Huskvarna December 29, 2009  
Bengt Frögelius, Development director chainsaw R&D (Authorized representative for Husqvarna AB and responsible for  
technical documentation.)  
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English – 33  
 
34 – English  
1153136-26 Rev.1 2009-12-29  
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English – 35  
Original instructions  
1153136-26  
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2009-12-29  
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