PSZ2450S
848-A59-93A0 (909)
U
S
OWNER'S/OPERATOR'S
MANUAL
POLE SAW
PSZ2450S
WARNING
The engine exhaust from this
product contains chemicals
known to the State of California to
cause cancer, birth defects or
other reproductive harm.
WARNING
Before using our products,
please read this manual carefully
to understand the proper use of
your unit.
APPLICABLE SERIAL NUMBERS :
90200101 and up
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PSZ2450S
1. Parts location
U
S
(1) Primer pump
(2) Air cleaner cover
(3) Choke lever
(4) Fuel tank
(5) Starter knob
(6) Spark arrester
(7) Gear case
(8) Chain cover
(9) Saw chain
(10) Guide bar
(11) Grip
(12) Drive shaft housing
(13) Sholder strap hanger
(14) Throttle trigger
(15) Stop switch
(16) Throttle cable
2. Specifications
■ PSZ2450S
Overall size (LxWxH) ····················································································· 83.9(2130) x 9.8(250) x 12.2(310) mm
Dry weight······································································································································ 11.2(5.04) lbs (kg)
Engine
Type··········································································································· Air-cooled 2-stroke gasoline
Model·········································································································································· GZ23N
3)
Displacement ············································································································ 1.5cu-in (23.6 cm
-1
Max. output ················································································· 1.15 Hp (0.858 kW)at 8000min (rpm)
-1
Idle speed················································································································3000 200min (rpm)
Fuel············································································································ Mixture (Gasoline 50 : Oil 1)
(when using RedMax genuine oil)
Carburetor ········································································································ Walbro Diaphragm type
Spark plug ····················································································································Champion RZ7C
Durability period ··························································································································300 hrs
Fuel tank capacity····························································································································21.3 fl.oz (0.63 )
Transmission········································································································ Centrifugal clutch, Rigid driveshaft
Gear ratio····························································································································································· 1.06
Cutting head
Guide bar Type···························································································· OREGON DOUBLE GUARD PS0011
Size······························································································································· 12(300) in.(mm)
Saw chain Type······················································································································· OREGON 90SG44X
Pich x Gauge························································································ 3/8x0.043 (9.53 x 1.09) in.(mm)
Sprocket ································································································································································· 7T
Oil pump ··················································································································································Plunger type
Standard Accessories
Shoulder Strap···················································································································································· 1 pc.
Goggle ································································································································································ 1 pc.
Tool Kit································································································································································ 1 pc.
Specifications are subject to change without notice.
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PSZ2450S
3. Warning labels on the machine
( )
1
( )
2
( )
3
( )
4
( )
5
( )
6
15m (50ft)
(1) Read owner's manual before operating this machine.
(2) Wear head, eye and ear protection.
(3) Warning! Danger of kickback.
(4) Beware of thrown objects.
(5) Warning/Attention
(6) Keep all children, bystanders and helpers 15 meters away from the brushcutter
IMPORTANT
If warning label peel off or become soiled and impossible to read, you should contact the dealer from which you
purchased the product to order new labels and affix them in the required location(s).
WARNING
Never modify your brushcutter.
We won't warrant the machine, if you use the remodeled brushcutter or you don't observe the proper
usage written in the manual.
4. Symbols on the machine
For safe operation and maintenance, symbols are
carved in relief on the machine. According to these
indications, please be careful not to take a mistake.
■ EMISSION CONTROL
An emission control label is located on the engine.
EMISSION CONTROL INFORMATION
THIS ENGINE MEETS U.S. EPA AND CALI-
(a) The port to refuel the "MIX GASOLINE"
Position: FUEL TANK CAP
1
FORNIA EXH / EVP REGS FOR 2009* S.O.R.E.
2
ENGINE FAMILY : 9HQZS.0244XY* DISPL.: 24cc
3
EMISSION CONTROL SYSTEM : EXH;EM/EVP;SP*
COMPLIANCE PERIOD : 300 HOURS
REFER TO OPERATOR'S MANUAL FOR MAINTE-
NANCE, SPECIFICATIONS AND ADJUSTMENTS.
MANUFACTURED:
(b) The direction to close the choke
Position: AIR CLEANER COVER
USE JASO FD OR ISO L-EGD GRADE 50:1 OIL
(c) The direction to open the choke
Position: AIR CLEANER COVER
*1: The year will be changed every year of manufacturing.
*2: The initial number will be changed every year of
manufacturing.
(d) If you turn the rod by screwdriver follow the arrow
to the "MAX" position, the chain oil flow more,
and if you turn to the "MIN" position, less.
Position: Bottom of the power unit
*3: SP : Sealed tank made of HDPE or PE.
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PSZ2450S
5. For safe operation
■ WORKING PLAN
1. Read this manual carefully until you
1. You should never use the product when
under the influence of alcohol, when
suffering from exhaustion or lack of sleep,
when suffering from drowsiness as a result
of having taken cold medicine or at any
other time when a possibility exists that
your judgment might be impaired or that
you might not be able to operate the
product properly and in a safe manner.
2. When planning your work schedule, allow
plenty of time to rest. Limit the amount of
time over which the product is to be used
continuously to somewhere around 30–40
minutes per session, and take 10–20
minutes of rest between work sessions.
Also try to keep the total amount of work
performed in a single day under 2 hours or
less.
completely understand and follow all
safety and operating instructions.
2. Keep this manual handy so that you
may refer to it later whenever any
questions arise. Also note, if you have
any questions which cannot be
answered herein, contact the dealer
from whom you purchased the product.
3. Always be sure to include this manual
when selling, lending, or otherwise
transferring the ownership of this
product.
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S
4. Never allow children or anyone unable
to fully understand the directions given
in the manual to use the machine.
■ WORKING CONDITION
1. When using the product, you should wear
proper clothing and protective equipment.
WARNING
1. If you don’t observe the working time,
or working manner (See ■USING THE
PRODUCT), Repetitive Stress
Injury(RSI) could occur.
If you feel discomfort, redness and
swelling of your fingers or any other
part of your body, see a doctor before
getting worse.
2. To avoid noise complaints, in general,
operate product between 8a.m. and
5p.m. on weekdays and 9a.m. to 5p.m.
weekends.
(1) Helmet
(2) Ear protectors
(3) Protection goggles or face protector
(4) Thick work gloves
(5) Non-slip-sole work boots
2. And you should carry with you.
(1) Attached tools and files
(2) Properly reserved fuel
(3) Spare blade
(4) Things to notify your working area
(rope, warning signs)
(5) Whistle (for collaboration or emergency)
(6) Hatchet or saw (for removal of
obstacles)
3. Do not wear loose clothing, jewelry, short
trousers, sandals, or go barefoot. Do not
wear anything which might be caught by a
moving part of the unit. Secure hair so it is
above shoulder length.
NOTE
Check and follow the local regulations as to
sound level and hours of operations for the
product.
■ BEFORE STARTING THE ENGINE
1. Operate the chain saw only in well
ventilated areas. Never start or run the
engine inside a closed room or building.
Exhaust fumes contain dangerous carbon
monoxide.
■ WORKING CIRCUMSTANCE
1. Never start the engine inside a closed
room or building. Exhaust gases contain
dangerous carbon monoxide.
2. The area within a perimeter of 50 feet (15
m) of the person using the product should
be considered a hazardous area into which
no one should enter. If necessary yellow
warning rope, warning signs should be
placed around the perimeter of the area.
When work is to be performed
simultaneously by two or more persons,
care should also be taken to constantly
look around or otherwise check for the
presence and locations of other people
working so as to maintain a distance
2. Never use the product:
a. when the ground is slippery or when you
can’t maintain a steady posture.
b. At night, at times of heavy fog, or at any
other times when your field of vision
might be limited and it would be difficult
to gain a clear view of the working area.
c. During rain storms, during lightning
storms, at times of strong or gale-force
winds, or at any other times when
weather conditions might make it unsafe
to use the product.
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PSZ2450S
5. For safe operation
between each person sufficient to ensure
safety.
3. Check the condition of working area to
avoid any accident by hitting hidden
obstacles such as stumps, stones, cans, or
broken grass.
1. Grip the handles firmly with both hands
using your whole hand. Place your feet
slightly apart (slightly further apart than the
width of your shoulders) so that your
weight is distributed evenly across both
legs, and always be sure to maintain a
steady, even posture while working.
2. Maintain the speed of the engine at the
level required to perform cutting work, and
never raise the speed of the engine above
the level necessary.
IMPORTANT
Remove any obstacle before beginning work.
4. Inspect the entire unit for loose fasteners
and fuel leakage. Make sure that the
cutting attachment is properly installed and
securely fastened.
3. Never operate the pruner at an angle
greater than 60° in order to reduce the risk
of being struck by falling objects during
operation.
5. Always use the shoulder strap. Adjust the
strap for comfort before starting the
engine. The strap should be adjusted so
the left hand can comfortably hold the
handlebar grip approximately waist high.
4. If the unit start to shake or vibrate, turn off
the engine and check the whole unit. Do
not use it until the trouble has been
properly corrected.
5. Keep all parts of your body away from
rotating cutting attachment and hot
surfaces.
■ STARTING THE ENGINE
1. Keep bystanders and animals at least 50
feet (15 m) away from the operating point.
If you are approached, immediately stop
the engine.
6. Never touch the muffler, spark plug, or
other metallic parts of the engine while the
engine is in operation or immediately after
shutting down the engine. Doing so could
result in serious burns or electrical shock.
2. The product is equipped with a centrifugal
clutch mechanism, so the cutting
attachment begins to rotate as soon as the
engine is started by putting the throttle into
the start position. When starting the
engine, place the product onto the ground
in a flat clear area and hold it firmly in
place so as to ensure that neither the
cutting part nor the throttle come into
contact with any obstacle when the engine
starts.
•
IF SOMEONE COMES
1. Guard against hazardous situations at all
times. Warn adults to keep pets and
children away from the area. Be careful if
you are approached. Injury may result from
flying debris.
2. If someone calls out or otherwise interrupts
you while working, always be sure to turn
off the engine before turning around.
■ MAINTENANCE
WARNING
1. In order to maintain your product in proper
working order, perform the maintenance
and checking operations described in the
manual at regular intervals.
Never place the throttle into the high
speed position when starting the engine.
3. After starting the engine, check to make
sure that the cutting attachment stops
rotating when the throttle is moved fully
back to its original position. If it continues
to rotate even after the throttle has been
moved fully back, turn off the engine and
take the unit to your authorized RedMax
servicing dealer for repair.
2. Always be sure to turn off the engine
before performing any maintenance or
checking procedures.
(1) Check ok !
WARNING
The metallic parts reach high
temperatures immediately after stopping
the engine.
■ USING THE PRODUCT
IMPORTANT
3. When replacing the cutting attachment or
any other part, or when replacing the oil or
any lubricant, always be sure to use only
RedMax products or products which
Cut only materials recommended by the
manufacturer. And use only for tasks
explained in the manual.
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PSZ2450S
5. For safe operation
have been certified by RedMax for use
during transport.
with the RedMax product.
4. In the event that any part must be replaced
or any maintenance or repair work not
described in this manual must be
performed, please contact a representative
from the store nearest RedMax authorized
servicing dealer for assistance.
5. Do not use any accessory or attachment
other than those bearing the RedMax mark
and recommended for the unit.
■ KICKBACK AND PINCHING SAFETY
PRECAUTIONS
Beware of kickback!
Kickback can occur whenever the tip of the
guide bar touches an object while the saw is
operating. Kickback may force the bar up and
back toward the operator with lightning-like
speed!
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6. Under no circumstances should you ever
take apart the product or alter it in any
way. Doing so might result in the product
becoming damaged during operation or the
product becoming unable to operate
properly.
Beware of pinching.
Pinching the saw along the tip of the guide
bar may force the bar back rapidly toward the
operator. Pinching can occur whenever wood
closes in around the moving chain.
WARNING
■ HANDLING FUEL
1. The engine of the RedMax product is
designed to run on a mixed fuel which
contains highly flammable gasoline. Never
store cans of fuel or refill the tank of the
unit in any place where there is a boiler,
stove, wood fire, electrical sparks, welding
sparks, or any other source of heat or fire
which might ignite the fuel.
Both kickback and pinching may cause
you to lose control of the pole pruner
which could result in serious personal
injury. Do not rely exclusively on the
safety device built into the pruner! You
must take several steps to keep your jobs
free from accident or injury:
2. Never smoke while operating the unit or
refilling its fuel tank.
1. Understand kickback and pinching! You
can reduce or eliminate the element of
surprise. Sudden surprises contributes to
accidents.
3. When refilling the tank, always turn off the
engine and allow it to cool down. Take a
careful look around to make sure that there
are no sparks or open flames anywhere
nearby before refueling.
2. Keep a firm grip on the pole pruner with
both hands whenever the engine is
running. A firm grip will help you reduce
the affects of kickback and pinching as well
as maintain control of the machine.
3. Make sure the area in which you are
cutting is free from obstructions. Do not let
the nose of the guide bar contact a log,
branch, or any other obstructions which
could be hit while you operation the pole
pruner.
(1) Refill after cooling the engine.
4. Wipe spilled fuel completely using a dry
rag if any fuel spillage occurs during
refueling.
5. After refueling, screw the fuel cap back
tightly onto the fuel tank and then carry the
unit to a spot 10 feet or more away from
where it was refueled before turning on the
engine.
4. Cut at high engine speeds.
5. Follow the manufacturer's instructions for
sharpening and maintaining the chain.
6. Use only the replacement bar and chain or
equivalent as specified by the
■ TRANSPORTATION
1. Never transport the pruner nor set it down
with the engine running. An engine that's
running could be accidently accelerated
causing the chain to rotate.
manufacturer.
WARNING
2. Make sure the scabbard is in place when
transporting the pruner.
3. When carrying by hand, the chain should
be pointing backward.
4. Never transport the product over rough
roads over long distances by vehicle
without removing all fuel from the fuel tank.
If doing so, fuel might leak from the tank
• Make sure the chain and sprocket are
correctly adjusted before operating the
pruner (see page 9 for adjustment
procedures). Never attempt chain
adjustment with the engine running!
• Always make sure the cutting
attachment is properly installed and
firmly tightened before operation.
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PSZ2450S
5. For safe operation
• Never use a cracked or warped guide
bar: replace it with a serviceable one
and make sure it fits properly.
• If a saw blade should bind fast in a cut,
shut off the engine immediately. Push
the branch or tree to ease the bind and
free the blade.
• Do not operate the pole pruner with the
muffler removed.
• When cutting a limb that is under
tension, be alert for springback so that
you will not be struck by the moving
limb.
• Always stop the engine immediately
and check for damage if you strike a
foreign object or if the machine
becomes tangled. Do not operate with
broken or damaged equipment.
IMPORTANT
• Do not make unauthorized modifications or
substitutions to the guide bar or chain.
• Never allow the engine to run at high RPM
without a load. Doing so could damage the
engine.
• Keep the pruner as clean as possible.
Keep it free of loose vegetation, mud, etc.
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PSZ2450S
6. Set up
■ MOUNTING ENGINE (SE1)
1. Push the driveshaft housing toward the
clutch housing and rotate it by hand to
check that the driveshaft is engaged
with the gears.
2. Insert the driveshaft housing into the
clutch housing until it bottoms, and
align the positioning holes on the both
housings and install the screw.
3. Fasten the clamp securely with 2
screws.
WARNING
SE1
The saw chain has very sharp edges.
Use protective gloves for safety.
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1. Loosen a nut and remove the chain
cover.
2. Mount the guide bar then fit the saw
chain around the bar and
sprocket.(SE5)
SE5
WARNING
SE2
■ CONNECTING THROTTLE WIRE
1. Remove the air cleaner cover.
2. Connect the end of the throttle wire to
the joint on the top of the carburetor.
(SE2)
Pay attention to the correct direction of
the saw chain
3. Fit the chain tensioner nut into the
lower hole of the guide bar, then install
the chain cover, and fasten the
mounting nut to finger tightness.
(SE5)(SE6)
SE6
■ CONNECTING SWITCH WIRES
• Connect the switch wires between the
engine and the main unit. Pair the wires
of the same color.
(1) Hole
(2) Moving direction
(3) Chain tensioner nut
■ ATTACHING THE PRUNING
MECHANISM (SE3)
1. Remove the cap on the end of the main
pipe.
2. Remove the screw screwed into the
end of the gear case.
3. Insert the end of the gear case into the
main pipe.
SE7
4. Adjust the chain tension by turning the
tensioner screw until the tie straps just
touch the bottom side of the bar rail.
(SE7)
SE3
4. Line up the hole on the end of the gear
case into which the screw is to be
inserted with the hole on the main pipe,
and screw the screw firmly in.
5. Using a wrench, screw in the bolt
provided to fix the mechanism into
place.
(1)
(2)
(1) Chain tension adjusting screw
(a) Loosen
(b)Tighten
(3)
(4)
(5)
5. Tighten the mounting nut securely with
the bar tip held up (SE8)(TORQUE:
8.9~11.7 N.m./90~120 kg-cm). Then
check the chain for smooth rotation and
correct tension while moving it by hand.
If necessary, readjustment.
SE8
(1) Main pipe
(2) Gear case
(3) Screw hole
(4) Fastening bolt
(5) Bolt
(1) Tighten
WARNING
A standard package contains the items as
shown below. (SE4)
SE4
It is very important to maintain the
proper chain tension. Rapid wear of
the guide bar or the chain coming off
easily can be caused by improper
tension. Especially when using a new
chain, take good care of it since it
should expand when first used.
(1) Guide bar
(2) Saw chain
(3) Gear case
(4) Sprocket
(5) Chain tension adjust screw
(6) Nut
(7) Chain tensioner nut
(8) Chain cover
■ BALANCE UNIT
1. Put on strap and attach unit to strap.
2. Depending on the working posture,
slide clamp up or down until unit
balances and the strap fits your body.
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Install the guide bar and the saw chain on
the gear case as follows.
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PSZ2450S
7. Fuel and Chain Oil
■ FUEL
lines or fuel tank of the engine.
WARNING
NOTE
• Gasoline is very flammable. Avoid smoking or bringing any
flame or sparks near fuel. Make sure to stop the engine and
allow it cool before refueling the unit. Select outdoor bare
ground for fueling and move at least 10 ft (3 m) away from
the fueling point before starting the engine.
• Failures caused by operating engines on gasoline with octane
rating lower than 89 are not covered by the RedMax Two-
Stroke engine warranty.
WARNING
• Alternative Fuels (Not Gasoline)
Alternative fuels, such as E-15 (15% ethanol), E-20 (20%
ethanol), E-85 (85% ethanol) are NOT classified as gasoline
and are NOT approved for use in RedMax 2-stroke gasoline
engines. Use of alternative fuels will cause major engine
performance and durability problems such as: improper
clutch engagements, overheating, vapor lock, power loss,
lubrication deficiency, deterioration of fuel lines, gaskets
and internal carburetor components, etc... Alternative fuels
cause high moisture absorption into the fuel/oil mixture
leading to oil and fuel separation.
■ GASOLINE REQUIREMENTS
• All 2-Stroke RedMax Products are powered by RedMax
Professional-Commercial Duty, Hi-Performance, Hi-RPM, Air
Cooled 2-Stroke engines.
RedMax – Hi-Performance 2-stroke engines produce higher HP
outputs as compared to standard Home Owner Duty or Light
Commercial Duty production engines offered by most
manufacturers.
• Exhaust emission are controlled by the fundamental engine
parameters and components (eq., carburation, ignition timing
and port timing) without addition of any major hardware or the
introduction of an inert material during combustion.
• The RedMax Engines are registered and certified with CARB
(California Air Resources Board) and EPA (Environmental
Protection Agency) to operate on CLEAN Mid-grade 89 octane
or Premium, unleaded (lead-free) gasoline and RedMax Air-
Cooled "Max Life", Synthetic blend Premium two-stroke engine
oil mixed at 50:1 ratio.
■ OIL REQUIREMENTS
• Use only RedMax "Max Life", Synthetic blend Premium Air-
Cooled two-stroke engine oil or oil certified to ISO-L-EGD
(ISO/CD1378) standard AND one that is JASO-FD registered.
RedMax Air-Cooled "Max Life", Synthetic blend Premium two
stroke engine oil and ISO-L-EGD (ISO/CD1378) AND JASO-FD
oils are fully compatible with gasoline's containing 10% Ethanol.
RedMax Air-Cooled "Max Life", Synthetic blend Premium two
stroke engine oil and ISO-L-EGD (ISO/CD1378) AND JASO-FD
oils are Universal and should be mixed at 50:1 ratio for all 2
stroke air cooled engines sold in the past regardless of mixing
ratios specified in those manuals.
• Unleaded gasoline is recommended to reduce the
contamination of the air for the sake of your health and the
environment.
• If the oil is registered with JASO, the JASO Logo with FD and
registration number will be displayed on the container. The
highest JASO rating is "FD", which equals the ISO-L-EGD
rating. Lower ratings are "FC", "FB", and "FA".
• This Hi-Performance Air Cooled 2-stroke Engine requires the
[ R+M ]
use of Minimum 89 Octane
(Mid grade or Premium)
2
clean gasoline. Gasoline may contain maximum of 10% Ethanol
(grain alcohol) or up to 15% MTBE (Methyl tertiary-butyl ether).
Gasoline containing Methanol (Wood Alcohol) is NOT
approved.
NOTE
• Engine problems due to inadequate lubrication caused by
failure to use ISO-L-EGD certified and JASO FD registered oil
such as "MaxLife", RedMax Synthetic blend Premium 2-stroke
oil WILL VOID THE REDMAX TWO-STROKE ENGINE
WARRANTY.
• IF octane rating of the Mid Grade gasoline in your area is lower
than 89 Octane use Premium Unleaded Gasoline. The majority
of all 2-stroke engine manufacturers in the USA and Canada
recommend using gasoline with 89 Octane or higher.
WARNING
WARNING
• Gasoline with an octane rating lower than 89 will greatly
increase the engines operating temperature. Low octane
gasoline will cause detonation (knock) resulting in piston
seizures and major internal engine components damage.
• Poor quality gasolines or oils may damage sealing rings, fuel
• Do not use NMMA (National Marine Manufacturers
Association), BIA (Boating Industry Association), and TCW (two
cycle water cooled) oils designed for MoPeds or Outboard,
water cooled Marine Engines. Do not use API (American
Petroleum Institute), TC (Two Cycle) labeled oils. The API-TC
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PSZ2450S
7. Fuel and Chain Oil
test standard has been discontinued by API in 1995 and it no
longer exists.
WARNING
1. Select flat and bare ground for fueling.
2. Move at least 10 feet (3 meters) away from the fueling point
before starting the engine.
3. Stop the engine before refueling the unit. At that time, be
sure to sufficiently agitate the mixed gasoline in the
container.
IMPORTANT
U
S
• Gasoline/Oil mixture Storage Recommendations
Store your gasoline or gasoline/oil mixture in a cool dry area in
a tightly sealed approved container to limit the entry of moisture
and additional air (oxygen). Moisture and air cause the
development of varnish and gum, making the fuel stale. Stored
gasoline and gasoline/oil mixture ages and loses its octane
rating and volatility. Do not mix more gasoline/oil than you
intend to use in 30 days, and 60 days when fuel stabilizer is
added. RedMax Air-Cooled "Max Life" Synthetic blend
Premium two-stroke engine oil "Contains fuel stabilizer" and
will automatically extend your gasoline/oil mixture life up to 60
days.
■ FOR YOUR ENGINE LIFE, AVOID
1. FUEL WITH NO OIL (RAW GASOLINE) – It will cause severe
damage to the internal engine parts very quickly.
2. GASOHOL – It can cause deterioration of rubber and/or plastic
parts and disruption of engine lubrication.
3. OIL FOR 4-CYCLE ENGINE USE – It can cause spark plug
fouling, exhaust port blocking, or piston ring seizure.
4. Mixed fuels which have been left unused for a period of
one month or more may clog the carburetor and result in the
engine failing to operate properly.
5. In the case of storing the product for a long period of time,
clean the fuel tank after rendering it empty. Next, Start the
engine and run the carburetor dry residual fuel.
6. In the case of scrapping the used mixed oil container, scrap it
only at an authorized depository site.
■ HOW TO MIX FUEL
RECOMMENDED MIXING RATIO
GASOLINE 50 : OIL 1
(when using RedMax Air-Cooled "Max
Life")
50:1 MIXING CHART
NOTE
GASOLINE
gal.
1
2
3
4
5
• As for details of quality assurance, read the description in the
section Limited Warranty carefully. Moreover, normal wear and
change in product with no functional influence are not covered
by the warranty. Also, be careful that, if the usage in the
instruction manual is not observed as to the mixed gasoline,
type of oil or fuel to be used. described therein, it may not be
covered by the warranty.
2-CYCLE OIL fl.oz
2.6
5.2
7.8 10.4 13
GASOLINE
liter
ml
1
2
3
4
5
2-CYCLE OIL
20
40
60
80
100
WARNING
■ CHAIN OIL
Use motor oil SAE #10W-30 all year round or SAE #30 ~ #40 in
summer and SAE #20 in winter.
• Pay attention to agitation.
1. Measure out the quantities of gasoline and oil to be mixed.
2. Put some of the gasoline into a clean, approved fuel container.
3. Pour in all of the oil and agitate well for 10seconds.
4. Pour in the rest of gasoline and agitate again for at least one
minute. As some oils may be difficult to agitate depending on oil
ingredients, sufficient agitation is necessary. Be careful that, if
the agitation is insufficient, there is an increased danger of early
piston seizure due to abnormally lean mixture.
5. Place a clear indication on the outside of the container to avoid
mixing up with gasoline or other containers that dont contain oil.
6. Indicate the contents on outside of container for easy
identification.
NOTE
Do not use wasted or regenerated oil that can cause damage to
the oil pump.
■ FUELING THE UNIT
1. Untwist and remove the fuel cap. Rest the cap on a clean
surface.
2. Put fuel into the fuel tank to 80% of the full capacity.
3. Fasten the fuel cap securely and wipe up any fuel spillage
around the unit.
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PSZ2450S
8. Operation
■ STARTING ENGINE
7. Move the choke lever downward to
open the choke. And restart the engine.
(OP3)
8. Allow the engine to warm up for a
several minutes before starting
operation.
WARNING
The cutting head will start rotating
upon the engine starts.
1. Feed fuel and chain oil into their
respective tanks and tighten the caps
securely. (OP1)
OP1
NOTE
1. When restarting the engine
immediately after stopping it, leave the
choke open.
(1) Fuel
(2) Chain oil
2. Overchoking can make the engine hard
to start due to excess fuel. When the
engine failed to start after several
attempts, open the choke and repeat
pulling the rope, or remove the spark
plug and dry it.
2. Rest the unit on a flat, firm place. Keep
the cutting head off the ground and
clear of surrounding objects as it will
start rotating upon starting of the
engine.
■ STOPPING ENGINE (OP4)
1. Release the throttle lever and run the
engine for a half minute.
OP2
3. Push the primer pump several times
until overflown fuel flows out in the
clear tube. (OP2)
2. Shift the ignition switch to the “Stop”
position. (OP4)
IMPORTANT
• Except for an emergency, avoid
stopping the engine while pulling the
throttle lever.
4. Move the choke lever to the closed
position. (OP3)
OP3
(1)
■ CHECKING OIL SUPPLY
• After starting the engine, run the chain
at medium speed and see if chain oil is
scattered off as shown in the figure.
(OP6)
OP6
(1) choke lever
(2) close
(3) open
(2)
(3)
5. Set the stop switch to the "RUN"
position. Place the unit on a flat, firm
place. Keep the cutting head clear of
everything around it. (OP4)
(1) Chain oil
OP4
(3)
(2)
NOTE
The oil reservoir has a capacity sufficient
to provide about 40 minutes of cutting
time (when set to deliver the minimum
flow rate, or about as long as you'll get
from a tank of fuel). Be sure to refill the oil
tank every time when refueling the saw.
(1) stop switch
(2) RUN
(3) STOP
(a)
(1)
(a) lockout lever
(b) throttle trigger
(b)
6. Firmly grasp (a) and (b) with left hand,
pull the starter knob quickly until engine
fires. (OP5)
OP5
IMPORTANT
• Avoid pulling the rope to its end or
returning it by releasing the knob. Such
actions can cause starter failures.
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PSZ2450S
8. Operation
■ ADJUSTING OIL FLOW RATE
■ ADJUSTING THROTTLE CABLE
OP8
• The normal play is 1 or 2mm when
measured at the carburetor side end.
Readjust with the cable adjuster as
required. (OP8)
WARNING
Never fill the oil reservoir nor adjust
the oiler with the engine running.
U
S
.04 in
(1~2mm)
(1)
(1) Cable adjuster
IMPORTANT
■ ADJUSTING IDLING SPEED (OP9)
1. When the engine tends stop frequently
at idling mode, turn the adjusting screw
clockwise.
2. When the cutting head keeps rotating
after releasing the trigger, turn the
adjusting screw counter-clockwise.
An increase in bar oil flow rate will speed
oil consumption, requiring more frequent
checks on the oil reservoir. To ensure
sufficient lubrication, It may be necessary
to check the oil level more frequently than
at fuel tank refills.
OP9
(1)
The guide bar and chain are lubricated
automatically by a pump that operates
whenever the chain rotates. The pump is
set at the factory to deliver a minimum
flow rate, but it can be adjusted in the
field. A temporary increase in oil flow is
often desirable when cutting things like
hardwood or wood with a lot of pitch.
(1) Idle adjusting screw
NOTE
• Warm up the engine before adjusting
the idling speed.
WARNING
Adjust the pump as follows:
1. Stop the engine and make sure the
stop switch is in the OFF position.
2. Place the unit on its side with the oil res
ervoir up. (OP7)
• Always wear work gloves made of
leather or some other sturdy
material when using the polesaw.
• Falling branches may fall onto the
face or into the eyes, resulting in
injuries, scratches, and cuts, and for
this reason you should always be
sure to wear a helmet and face
(1) Oil tank
(2) Chain cover
OP7
protector when using your polesaw.
IMPORTANT
The oil flow adjusting screw must be
pressed in slightly in order to turn. Failure
to do so could damage the pump and
screw.
3. With a screwdriver, push in on the oil
flow rate adjusting screw and turn in
the desired direction (there are three
incremental settings):
(a) Clockwise-decrease lubrication.
(b)Counter clockwise-increase
lubrication.
(c) Middle
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PSZ2450S
9. Maintenance
Maintenance, replacement, or repair of the emission control device and systems may be performed by any
non-road engine repair establishment or individual.
■ MAINTENANCE CHART
Every
25
Before hours
Every
50
hours
after
Every
100
hours note
after
System/compornent
Procedure
use
after
fuel leaks, fuel spillage
wipe out
✔
fuel tank, air filter, fuel filter
inspect/clean
✔
✔
replace, if necessary
see ■ADJUSTING
IDLING SPEED (p.13)
replace carburetor
if necessary
idle adjusting screw
✔
clean and readjust
electrode gap
GAP: .025in(0.6~0.7 mm)
replace, if necessary
spark plug
✔
cylinder fins, intake air cooling vent
clean
✔
✔
muffler, spark arrester,
cylinder exhaust port
clean,
remove piled up carbon
✔
✔
throttle lever, ignition switch
gear case
check operation
grease
✔
screws/nuts/bolts
oiling port
tighten/replace
clean
✔
✔
✔
not adjusting screws
guide bar
clean
sprocket
inspect/replace
inspect/replace
✔
saw chain
✔
■ OILING PORT
Dismount the guide bar and check the
oiling port for clogging. (MA1)
■ OTHERS
MA1
Check for fuel leakage and loose
fastenings or damage to major parts,
especially housing joints and guide bar
mounting. If any defects are found, make
sure to have them repaired before
operating again.
(1)
(1) Oiling port
■ SPROCKET
MA4
■ GUIDE BAR
Remove sawdust in the bar groove and
the oiling port. (MA2)
Check for extensive wear, and replace it
when the teeth are worn over 0.3mm.
(MA4)
MA2
(1) Groove
(1) Sprocket
(2) Oiling port
■ GUIDE BAR
The bar rail should always be a square.
Check for wear of the bar rail. Apply a
ruler to the bar and the outside of a cutter.
If a gap is observed between them, the
rail is normal. Otherwise, the bar rail is
worn. Such a bar needs to be corrected or
replaced.(MA5)
MA5
(Type: Sprocket nose)
Grease the nose sprocket from the
feeding port on the tip of the bar. (MA3)
MA3
(1) Grease port
(2) Sprocket
(1) Ruler
(2) Gap
(3) No gap
(4) Chain tilts
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PSZ2450S
9. Maintenance
■ SAW CHAIN
Make sure every cutter has the same
length and edge angles as illustrated.
(MA8)
MA8
WARNING
It is very important for smooth and
safe operation to keep the cutters
always sharp.
(4) Cutter length
(5) Filing angle
(6) Side plate angle
(7) Top plate cutting angle
U
S
Your cutters need to be sharpened when:
• Sawdust becomes powder-like.
• You need extra force to saw in.
• The cut way does not go straight.
• Vibration increases.
• Fuel consumption increases.
Cutter setting standards:
■ AIR FILTER
MA9
• The air filter, if clogged, will reduce the
engine performance. Check and clean
the filter element. If the element is
broken or clogged, replace with a new
one. (MA9)
WARNING
Be sure to wear safety gloves.
Before filing:
• Make sure the saw chain is held
securely.
MA6
(1)
(1) Air filter
• Make sure the engine is stopped.
• Use a round file of proper size for your
chain.
■ FUEL FILTER
MA10
• When the engine runs short of fuel
supply, check the fuel cap and the fuel
filter for blockage. (MA10)
Chain type : 90SG
File size : 5/32 in (4.0mm)
(1) Fuel filter
Place your file on the cutter and push
straight forward. Keep the file position as
illustrated. (MA6)
(1)
■ SPARK PLUG
• Starting failure and mis-firing are often
caused by a fouled spark plug. Clean
the spark plug and check that the plug
gap is in the correct range. For a
replacement plug, use the correct type
specified by RedMax. (MA11)
• REPLACEMENT PLUG IS A
CHAMPION RZ7C.
MA11
.025 in
0.655mm
MA7
After every cutter has been set, check the
depth gauge and file it to the proper level
as illustrated. (MA7)
IMPORTANT
• Note that using any spark plug other
than those designated may result in the
engine failing to operate properly or in
the engine becoming overheated and
damaged.
WARNING
Be sure to round off the front edge to
reduce the chance of kickback or tie-
strap breakage.
• To install the spark plug, first turn the
plug until it is finger tight, then tighten it
a quarter turn more with a socket
wrench.
(1) Appropriate gauge checker
(2) Make the shoulder round
(3) Depth gauge standard
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PSZ2450S
9. Maintenance
TIGHTENING TORQUE:
87–121 (in-lbs)
check the area around the muffler
and remove any wood chips or
leaves which have attached
(9.8–13.7 N.m.)
themselves to the brushcutter.
Failing to do so could cause the
muffler to become overheated, and
that this in turn could cause the
engine to catch on fire. Always
make sure that the muffler is clean
and free of wood chips, leaves, and
other waste before use.
• Check the intake air cooling vent and
the area around the cylinder cooling
fins after every 25 hours of use for
blockage, and remove any waste which
has attached itself to the brushcutter.
Note that it is necessary to remove the
engine cover shown in (MA14) in order
to be able to view the upper part of the
cylinder.
■ MUFFLER
WARNING
• Inspect periodically, the muffler for
loose fasteners, any damage or
corrosion. If any sign of exhaust
leakage is found, stop using the
machine and have it repaired
immediately.
• Note that failing to do so may result
in the engine catching on fire.
■ SPARK ARRESTER (MA12)
• The muffler is equipped with a spark
arrester to prevent red hot carbon from
flying out of the exhaust outlet.
Periodically inspect and clean as
necessary with a wire brush.
MA12
IMPORTANT
In the State of California it is required
by law (Section 4442 of the California
Public Resources Code) to equip a
spark arrester when a gas powered tool
is used in any forest covered, brush
covered, or grass covered unimproved
land.
• If waste gets stuck and causes
MA14
(1)
blockage around the intake air cooling
vent or between the cylinder fins, it may
cause the engine to overheat, and that
in turn may cause mechanical failure
on the part of the brushcutter. (MA14)
(1)
(2)
(1) cylinder
(1) Spark arrester
(2) intake air cooling vent (back)
■ GEAR CASE (MA13)
■ PROCEDURES TO BE PERFORMED
AFTER EVERY 100 HOURS OF USE
1. Remove the muffler, insert a
screwdriver into the vent, and wipe
away any carbon buildup. Wipe away
any carbon buildup on the muffler
exhaust vent and cylinder exhaust port
at the same time.
2. Tighten all screws, bolts, and fittings.
3. Check to see if any oil or grease has
worked its way in between the clutch
lining and drum, and if it has wipe it
away using oil-free, lead-free gasoline.
The reduction gears are lubricated by
multipurpose, lithium-based grease in the
gearcase.
Supply new grease every 25 hours of use
or more often depending on the job
condition.
When adding lubricant, use a grease gun
to insert lubricant into the three grease
nipples located on the gear case.
MA15
MA13
(1) Grease fitting
■ INTAKE AIR COOLING VENT
WARNING
• Never touch the cylinder, muffler, or
spark plugs with your bare hands
immediately after stopping the
engine. The engine can become
very hot when in operation, and
doing so could result in severe
burns.
• When checking the machine to make
sure that it is okay before using it,
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PSZ2450S
10. Storage
• Aged fuel is one of major causes of
engine starting failure. Before storing
the unit, empty the fuel tank and run
the engine until it uses all the fuel left in
the fuel line and the carburetor. Store
the unit indoor taking necessary
U
S
measures for rust prevention.
11. Disposal
• When disposing your machine, fuel or
oil for the machine, be sure to allow
your local regulations.
12. Troubleshooting guide
Case 1. Starting failure
CHECK
PROBABLE CAUSES
incorrect fuel
ACTION
fuel tank
fuel filter
➞
➞
➞
➞
➞
➞
➞
➞
➞
➞
➞
➞
drain it and with correct fuel
clean
fuel filter is clogged
out of normal range
spark plug is fouled/wet
plug gap is incorrect
disconnected
carburetor adjustment screw
sparking (no spark)
adjust to normal range
clean/dry
correct (GAP: 0.6 – 0.7 mm)
retighten
spark plug
Case 2. Engine starts but does not keep running/Hard re-starting.
CHECK
PROBABLE CAUSES
incorrect fuel or staled fuel
out of normal range
carbon is built-up
ACTION
drain it and with correct fuel
adjust to normal range
wipe away
fuel tank
➞
➞
➞
➞
➞
➞
➞
➞
➞
➞
carburetor adjustment screw
muffler,cylinder (exhaust port)
air cleaner
clogged with dust
replace
cylinder fin, fan cover
clogged with dust
clean
When your unit seems to need further service, please consult with our service shop in your area.
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PSZ2450S
FEDERAL AND CALIFORNIA EMISSIONS CONTROL WARRANTY
STATEMENT YOUR WARRANTY RIGHTS AND OBLIGATIONS
The EPA (U.S. Environmental Protection Agency), CARB (California Air Resources Board), Environment
Canada and RedMax are pleased to explain the emissions control system's warranty on your 2009 and later
small off-road engine. In U.S. and Canada, new equipment that use small off-road engines must be designed,
built, and equipped to meet the applicable Federal or Californian stringent anti-smog standards. RedMax must
warrant the emissions control system on your small off-road engine for the period listed below provided there
has been no abuse, neglect or improper maintenance of your equipment. Your emissions control system may
include parts such as carburetor, ignition system, catalytic converter, fuel tank, filters and other associated
components. Also, included may be hoses, belts, connectors, sensors, and other emission-related assemblies.
Where a warrantable condition exists, RedMax will repair your small off-road engine at no cost to you including
diagnosis, parts and labor.
MANUFACTURER'S WARRANTY COVERAGE
This emissions control system is warranted for two years or if the product qualifies for a longer warranty period
resulting from the type of use, that period shall prevail. If any emissions-related part on your equipment is
defective, the part will be repaired or replaced by RedMax.
OWNER'S WARRANTY RESPONSIBILITIES
As the small off-road engine owner, you are responsible for performance of the required maintenance listed in
your Owner's Manual. RedMax recommends that you retain all receipts covering maintenance on your small off-
road engine, but RedMax cannot deny warranty solely for the lack of receipts or your failure to ensure the
performance of all scheduled maintenance. As the small off-road engine owner, you should however be aware
that the RedMax may deny you warranty coverage if your small off-road engine or a part has failed due to
abuse, neglect, or improper maintenance or unapproved modifications.
You are responsible for presenting your small off-road engine to a RedMax distribution center or service center
as soon as the problem exists. The warranty repairs should be completed in a reasonable amount of time, not to
exceed 30 days. If you have any questions regarding your warranty coverage, you should contact RedMax at 1-
800-291-8251 or via e-mail at [email protected].
WARRANTY COMMENCEMENT DATE
The warranty period begins on the date the engine or equipment is delivered to an ultimate purchaser.
LENGTH OF COVERAGE
RedMax warrants to the ultimate purchaser and each subsequent owner that the engine or equipment is
designed, built, and equipped so as to conform with all applicable regulations adopted by EPA and CARB, and
is free from defects in materials and workmanship that causes the failure of a warranted part for a period of two
years.
WHAT IS COVERED
REPAIR OR REPLACEMENT OF PARTS Repair or replacement of any warranted part under the warranty
must be performed at no charge to the owner at a warranty station. Warranty services or repairs will be provided
at all RedMax distribution centers that are franchised to service the subject engines. Throughout the emissions
warranty period of two years, RedMax must maintain a supply of warranted parts sufficient to meet the expected
demand for such parts.
WARRANTY PERIOD Any warranted part that is scheduled for replacement as required in the maintenance
schedule, is warranted for the period of time prior to the first scheduled replacement point for that part. If the
part fails prior to the first scheduled replacement, the part will be repaired or replaced by RedMax at no cost.
Any such part repaired or replaced under warranty is warranted for the remainder of the period prior to the first
scheduled replacement point for the part. Any warranted part that is not scheduled for replacement as required
in the maintenance schedule, is warranted for two years or if the product qualifies for a longer warranty period
resulting from the type of use, that period shall prevail. If any such part fails during the period of warranty
coverage, it will be repaired and replaced by RedMax at no cost. Any such part repaired or replaced under the
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PSZ2450S
warranty is warranted for the remaining warranty period. Any warranted part that is scheduled only for regular
inspection in the maintenance schedule will be warranted for a period of two years. A statement in such written
instructions to the effect of "repair or replace as necessary" will not reduce the period of warranty coverage. Any
such part repaired or replaced under warranty will be warranted for the remaining warranty period.
U
S
DIAGNOSIS The owner must not be charged for diagnostic labor that leads to the determination that a
warranted part is in fact defective, provided that such diagnostic work is performed at a warranty station.
CONSEQUENTIAL DAMAGES RedMax is liable for damages to other engine components proximately caused
by a failure under warranty of any warranted part.
EMISSION WARRANTY PARTS LIST
1. Air-induction system*
2. Fuel system*
3. Ignition system*
4. Fuel tank, cap and lines as applicable*
*some components only covered up to point specified by maintenance schedule
WHAT IS NOT COVERED
All failures caused by abuse, neglect or improper maintenance are not covered.
ADD-ON OR MODIFIED PARTS
Add-on or modified parts that are not exempted by CARB or EPA may not be used. The use of any non-
exempted add-on or modified parts will be grounds for disallowing a warranty claim. RedMax will not be liable to
warrant failures of warranted parts caused by the use of a non-exempted add-on or modified part.
HOW TO FILE A CLAIM
If you have any questions regarding your warranty rights and responsibilities, you should contact your nearest
authorized servicing dealer or contact RedMax at 1-800-291-8251 or via e-mail at [email protected].
WHERE TO GET WARRANTY SERVICE
Warranty services or repairs are provided through all RedMax authorized servicing dealers.
MAINTENANCE, REPLACEMENT AND REPAIR OF EMISSION-RELATED PARTS
Any replacement part may be used in the performance of any warranty maintenance or repairs and must be
provided without charge to the owner. Such use will not reduce the warranty obligations of the manufacturer.
MAINTENANCE STATEMENT
The owner is responsible for the performance of all required maintenance, as defined in the operator's manual.
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