SHINDAIWA OWNER’S/OPERATOR'S MANUAL
AHS2510 ARTICULATED
HEDGE TRIMMER
WARNING!
Always wear eye and ear pro-
tection when operating this machine!
To minimize the risk of injury to yourself
and others, read this manual and famil-
iarize yourself with its contents.
Part Number 68800-94313 Rev. 3/07
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Safety Equipment and Labels
Shaft Safety Label
Cutter Guard
Cutter Blade
Scabbard
Stop
Switch
IMPORTANT!
Caution, Danger, Warning, and
Operation Information Labels:
Make sure all information labels are
undamaged and readable. Imme-
diately replace damaged or missing
information labels. New labels are
available from your local authorized
Shindaiwa dealer.
Throttle
Interlock
Handle
Figure 1
Operating Precautions
WARNING!
n 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.
n Never transport the articulated
hedge trimmer or leave it unat-
tended with the engine running.
An engine that’s running could be
accidently accelerated causing the
blades to oscillate.
n Make sure there is always good
ventilation when operating the
articulated hedge trimmer. Fumes
from engine exhaust can cause seri-
ous injury or death. Never run the
engine indoors!
n When cutting a branch that is under
tension, be alert for spring-back so
that you will not be struck by the
moving branch.
n Make sure the cover is in place
when transporting the articulated
hedge trimmer.
n Never smoke or light fires near the
hedge trimmer. Keep the trimmer
away from excessive heat. Engine
fuel is very flammable and fire could
lead to serious personal injury or
property damage.
n If a cutter should bind fast in a cut,
shut off the engine immediately.
Push the branch or tree to ease the
bind and free the cutter.
n Always make sure the cutter attach-
ment is properly installed and firmly
tightened before operation.
n Make sure the cutters are correctly
adjusted before operating the articu-
lated hedge trimmer (see page 13
for cutter adjustment procedures).
Never attempt cutter adjustment
with the engine running!
n Inspect for broken, missing or
improperly installed parts or attach-
ments.
n Always stop the engine and allow
it to cool before refueling. Avoid
overfilling and wipe off any fuel that
may have spilled.
n Never use a cracked or warped
cutter or cutter bar: replace it with
a serviceable one and make sure it
fits properly.
n Before starting the engine, make
sure the cutter is not contacting
anything.
n Make sure there are no missing or
loose fasteners, and that the stop
switch and throttle controls are
working properly.
n Stop the machine immediately if it
suddenly begins to vibrate or shake.
3
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Operating the Articulated Hedge Trimmer
CAUTION!
Always wear a hard hat to reduce
the risk of head injuries during
operation of this machine.
n Always maintain the articulated
hedge trimmer according to this
owner’s manual and follow the
recommended scheduled mainte-
nance.
Secure long hair
so it is above
shoulder level.
Always wear eye and hearing protec-
n Never modify or disable any of the
tion. Shindaiwa recommends wearing
a face shield as additional face and
eye protection.
hedge trimmer’s safety devices.
n Always use genuine Shindaiwa
parts and accessories when repair-
ing or maintaining this machine.
Always operate with
both hands firmly grip-
ping the machine.
Wear non-slip heavy-duty
gloves to improve your
grip on the trimmer handle.
Wear snug-fitting clothes
that also permit freedom of
movement. NEVER wear
shorts!
n Do not make unauthorized modi-
fications to the articulated hedge
trimmer.
n Never allow the engine to run at
high RPM without a load. Doing so
could damage the engine.
n When transporting the hedge trim-
mer in a vehicle, tie it down securely
to prevent fuel spillage or damage
to the machine.
n Always stop the engine and allow
it to cool before refueling. Avoid
overfilling and wipe off any fuel that
may have spilled.
n Never place flammable material
close to the engine muffler and
never run the engine without the
spark arrestor screen in place.
Keep a proper footing and do not
overreach—maintain your balance
at all times during operation.
Keep bystanders at least 50 feet
(15 meters) away from the operat-
ing trimmer to reduce the risk of
being struck by falling objects or
thrown debris.
n Always clear your work area of
trash or hidden debris to help en-
sure good footing.
n Keep the cutters sharp and properly
adjusted.
n Keep the articulated hedge trimmer
as clean as possible. Keep it free of
loose vegetation, mud, etc.
Wear sturdy footwear with nonslip
soles to provide good footing.
Steel-toed safety boots are recom-
mended. Never operate machine
bare-footed.
Figure 2
4
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Product Description
Prior To Assembly
Using Figure 3 as a guide, familiarize your-
self with the Shindaiwa AHSꢀ510 articulat-
ed hedge trimmer and its various compo-
nents. Understanding your machine helps
ensure top performance, longer service life,
and safer operation.
Before assembling, make sure you have
all the components required for a complete
unit:
Air Filter
Spark
Assembly
Plug
Hedge Trimmer Cutter
Assembly
Stop Switch
Cutter
Assembly
Adjustment
Lever
Cutter Blade
Scabbard
Fuel Tank
n Engine/outer tube assembly
n Gearcase/cutter assembly
Throttle
Trigger
Fuel Tank Guard
Outer
Tube
n Kit with this manual and tool kit for
Powerhead Assembly
routine maintenance.
n Cutter blade scabbard
Handle
Carefully inspect all components for damage.
Handle
Grip
Latch Lock
Hedge Trimmer
Cutter Assembly
Cutter Guard
WARNING!
Recoil
Starter
Do not make unauthorized modifica-
tions or alterations to your articulated
hedge trimmer or its components.
Latch
Release
Cutter Bar and
Cutter Blades
Fuel Tank
Guard
Gearcase
Figure 3
IMPORTANT!
The terms “left”, “left-hand”, and “LH”;
“right”, “right-hand”, and “RH”; “front” and
“rear” refer to directions as viewed by the
operator during normal operation.
Specifications
Spark Plug.....................................................................NGK CMR5H
Model Name............................................................................AHSꢀ510
Engine Model...........................................................................SFꢀ510E
Engine Type................................4-cycle, vertical cylinder, air cooled
Dry Weight....................................................................6.ꢀ kg/13.6 lbs.
Bore x Stroke.................................................34 x ꢀ7 mm/1.34 X1.06”
Displacement.............................................................ꢀ4.5cc/1.5 cu. in.
Air Filter.................................................Non-reversible, heavy duty,
two-stage, filter element
Starting Method...........................................................Recoil Starter
Stopping Method............................................................Slide Switch
Cooling System..................................................................Forced Air
Transmission Type...........................Automatic, centrifugal clutch
with bevel gear
-1
Engine Speed at Maximum Power Output............7,500 rpm (min )
Maximum Power Output..............................................1.1 hp/0.8 kW
Blade Length...........................................................567 mm/ꢀꢀ.3 in.
Cutter Drive.......................................................................Spur Gear
Gear Lubricant..............................................Lithium Based Grease
-1
Engine Speed at Idling............................................3,000 rpm (min )
-1
Maximum Engine Speed......................................10,500 rpm (min )
Fuel/Oil Ratio...........................................50:1 with Premium ꢀ-cycle
air cooled mixing oil
Standard Equipment: Tool kit containing a spark plug wrench,
4mm hex wrench, and 8 x 10 mm spanner
Fuel Tank Capacity.........................................................590 ml/ꢀ0 oz.
Optional Equipment: Harness and bracket, front handle
Carburetor............................................Walbro WYL diaphragm type
Ignition System, Fully electronic, program controlled
Specifications are subject to change without notice.
5
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Assembly
Connect the Powerhead/Outer
Tube to the Gearcase
1. Place the powerhead/outer Tube As-
sembly on a clean, flat surface, spark
plug facing up.
Gearcase/Cutter
Assembly
ꢀ. Use the 4mm hex wrench to loosen the
tube clamp and index screw. Verify that
the D-shaped shim washer is positioned
as shown in Figure 4.
Tube
Clamp
CAUTION!
Outer Tube
Do not remove the D-shaped shim
washer! The shim washer prevents
damage from overtightening the tube
clamp screw.
Index Screw
Clamp Screw
D-Washer
Mainshaft
3. Slide the outer tube into the tube clamp
until the tube bottoms. If installation is
difficult, rotate the outer tube or main
shaft slightly until you feel the main-
shaft splines engage with the gearcase.
Index
Hole
Figure 4
5. Using finger pressure only, thread the
index screw into the index hole located
on the outer tube until it bottoms out.
NOTE:
It may be necessary to twist the outer tube
slightly for the index screw to be inserted fully.
CAUTION!
6. Tighten the index screw and the clamp
screw firmly.
Do not force the shaft tube into the
gearcase! Excessive force can dam-
age the shaft tube and mainshaft.
4. Position the outer tube so that the index
hole on the outer tube is aligned with
the index screw on the gearcase tube
clamp.
6
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Adjusting the Hedge Trimmer Cutter Assembly
Various blade
positions possible
ꢀ. With the index finger of your left
WARNING!
hand, press the latch lock. With your
left thumb, press the latch release.
See Figure 6.
The cutter blades are very sharp.
Do not grasp the blades with your
hands. Do not allow the blades to
contact your body.
IMPORTANT!
Always use gloves when working near the
cutter assembly.
The cutter assembly
can be adjusted to
10 different posi-
tions ranging from
90° to ꢀꢀ5° from the
outer tube as shown.
Always make sure
the lock latch is
Adjustment Lever
Latch Release
Figure 6
3. While holding the latch release down,
pivot the cutter assembly using the
adjustment lever until it is at the desired
cutting angle.
securely locked after
each adjustment.
Travel Limiter
Latch Lock
Figure 8
Adjusting Cutter Assembly for
Storage or Transportation
Figure 5
4. Release the latch lock and the latch
release. Make sure the latch lock and
the latch release return securely to the
straight ahead position.
Figure 7
1. With your right hand, grasp the outer
tube near the handle. With your left
hand, grip the adjustment lever on the
cutter assembly. See Figure 5.
NOTE:
The AHSꢀ510 Articulated hedge trimmer is
equipped with a travel limiter that prevents
the cutter assembly from rotating outside of
the 90°- ꢀꢀ5° range. See Figures 7 and 8.
5. Remove the scabbard from the cutter
blade. The engine now may be started
(refer to page 10 for procedures).
IMPORTANT!
The latch lock provides an interlock to
help prevent inadvertent depression of
the latch release.
7
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Mixing Fuel
CAUTION!
Some gasolines contain alcohol as
an oxygenate! Oxygenated fuels may
cause increased operating tem-
peratures. Under certain conditions,
alcohol-based fuels may also reduce
the lubricating qualities of some mixing
oils. Never use any fuel containing
more than 10% alcohol by volume!
Generic oils and some outboard motor
oils may not be intended for use in
high-performance air cooled engines,
and should never be used in your
Shindaiwa Articulated Hedge Trimmer!
CAUTION!
n Use only fresh, clean unleaded gasoline
with an octane rating of 87 or above.
This engine is certified to operate on
a 50:1 mixture consisting of unleaded
gasoline and ISO-L-EGD or JASO FC
class 2-cycle mixing oil only.
n Mix all fuel with Shindaiwa Premium
ONE ꢀ-cycle Mixing Oil at a gasoline/
oil ratio of 50:1 (1-gallon of gasoline to
ꢀ.6 oz. mixing oil).
IMPORTANT!
Mix only enough fuel for your immediate
needs! If fuel must be stored longer than
30 days, it should first be treated with a
stabilizer such as StaBil™.
Filling the Fuel Tank
1. Place the trimmer on a flat, level sur-
face.
WARNING!
Minimize the risk of fire!
ꢀ. Clear any dirt or other debris from
around the fuel filler cap.
n STOP engine before refueling.
n ALWAYS allow the engine to cool
before refueling!
n Wipe all spilled fuel and move the
engine at least 10 feet (3 meters)
from the fueling point and source
before restarting!
3. Remove the fuel cap, and fill the fuel
tank with a clean, fresh fuel mixture.
DO NOT OVERFILL.
4. Install and firmly tighten the fuel cap.
n NEVER start or operate this
unit if there is a fuel leak.
n NEVER start or operate this
unit if the carburetor, fuel lines, fuel
tank and/or fuel tank cap
are damaged.
n NEVER smoke or light any fires
near the engine or fuel source!
n NEVER place any flammable mate-
rial near the engine muffler!
n NEVER operate the engine without
the muffler and spark arrester in good
working condition.
8
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Starting the Engine
IMPORTANT!
IMPORTANT!
Engine ignition is controled by a two
position switch mounted on the throttle
housing labeled, "I" for ON or START and
"O" for OFF or STOP.
If the engine fails to start after several
attempts with the choke in the closed
position, the engine may be flooded
with fuel. If flooding is suspected,
move the choke lever to the open position
and repeatedly pull the recoil starter to
remove excess fuel and start the engine.
If the engine still fails to start, refer to the
troubleshooting section of this manual.
Make sure the
cutting attach-
ment
is clear of
obstructions!
ON
When the Engine Starts...
n After the engine starts, allow the engine
to warm up at idle ꢀ or 3 minutes before
operating the unit.
Throttle Lock
Button
Figure 12
Figure 9
5. While holding the outer tube firmly
with left hand. Use your other hand
to slowly pull the recoil starter handle
until resistance is felt, then pull quickly
to start the engine.
1. Slide the ignition switch to the “ON”
position. See Figure 9.
ꢀ. Set the throttle lever to the “fast idle”;
n Advancing the throttle makes the cut-
ting attachment oscillate faster; releas-
ing the throttle permits the attachment
to stop oscillating. If the cutting attach-
ment continues to oscillate when the
engine returns to idle, carburetor idle
speed should be adjusted (see "Adjust-
ing Engine Idle" on the next page).
a. Squeeze the throttle lever toward the
handgrip on the shaft tube.
CAUTION!
b. Depress and hold the throttle lock
Do not pull the recoil starter to the end
of the rope travel. Pulling the recoil
starter to the end of the rope travel can
damage the starter.
button.
c. While depressing the throttle lock
button, release the throttle lever.
Then release the throttle lock button.
Starting A Flooded Engine
See Figure 9.
1. Disconnect the spark plug lead and use
the spark plug wrench to remove the
spark plug (turn counter clockwise to
remove).
Return Tube
WARNING!
The cutting blades may move (oscil-
late) when the engine is started. Keep
away from the cutter assembly while
starting the engine!
ꢀ. Slide the ignition switch to the “O”
(STOP) position.
If the spark plug is fouled or soaked with
fuel, clean the plug as necessary.
Primer Bulb
Figure 10
3. Open the choke (Figure 13) and fully
depress the throttle lever with your left
hand, then pull the starter handle rap-
idly with your right hand to clear excess
fuel from the combustion chamber.
6. When the engine starts, slowly move
the choke lever to the "OPEN" position.
See Figure 13. (If the engine stops
after the initial start, close the choke
and restart.)
3. Press the primer bulb until fuel can be
seen flowing in the transparent return
tube.
IMPORTANT!
The primer system only pushes fuel
through the carburetor. Repeatedly
pressing the primer bulb will not flood the
engine with fuel.
4. Reinstall the spark plug and tighten it
firmly. If a torque wrench is available,
torque the spark plug to 148–165 in.-lb
(170–190 kg/cm).
Open
5. Repeat the starting procedure for a
warm engine.
6. If the engine still fails to start, refer to
the troubleshooting section near the
end of this manual.
Closed
4. Set the choke
lever to the
CLOSED posi-
tion if engine is
cold.
Figure 11
Figure 13
WARNING!
Never start the engine from the oper-
ating position.
9
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Stopping the Engine
Idle the engine briefly before stopping
(about ꢀ minutes), then slide the ignition
switch to the “O” (Engine OFF) position.
OFF
Figure 14
Adjusting Engine Idle
NOTE:
WARNING!
Carburetor fuel mixture adjustments are
preset at factory and cannot be serviced in
the field.
The cutting blades must NEVER move
(oscillate) at engine idle! If the idle
speed cannot be adjusted by the pro-
cedure described here, return the unit
to your Shindaiwa dealer for inspec-
tion.
Idle Speed Adjustment
1. Place the unit on the ground and start
the engine, then allow it to idle ꢀ-3 min-
utes until warm.
Idle Adjusting
Figure 15
Screw
ꢀ. If the cutting blades oscillate when the
engine is at idle, reduce the idle speed
by turning the idle adjustment screw
counter-clockwise. See Figure 15.
The engine must return to idle speed
whenever the throttle lever is released.
Idle speed is adjustable, and must be set
low enough to permit the engine clutch to
disengage the cutting attachment.
3. If a tachometer is available, the engine idle
speed should be final adjusted to 3,000
( 300) rpm (min-1).
10
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General Maintenance
IMPORTANT!
MAINTENANCE, REPLACEMENT, OR
REPAIR OF EMISSION CONTROL DEVIC-
ES AND SYSTEM MAY BE PERFORMED
BY ANY REPAIR ESTABLISHMENT OR
INDIVIDUAL. HOWEVER, WARRANTY
REPAIRS MUST BE PERFORMED BY A
DEALER OR SERVICE CENTER AUTHO-
RIZED BY SHINDAIWA CORPORATION
AND USE OF PARTS THAT ARE NOT
EQUIVALENT IN PERFORMANCE AND
DURABILITY TO AUTHORIZED PARTS
MAY IMPAIR THE EFFECTIVENESS OF
THE EMISSION CONTROL SYSTEM AND
MAY HAVE A BEARING ON THE OUT-
COME OF THE WARRANTY CLAIM.
WARNING!
WARNING!
Before performing any maintenance,
repair, or cleaning work on the
machine, make sure the engine and
cutting attachment are completely
stopped. Disconnect the spark plug
wire before performing service or
maintenance work.
Non-standard parts may not operate
properly with your unit and may cause
damage and lead to personal injury.
IMPORTANT!
Using non-standard replacement parts
could invalidate your Shindaiwa warranty.
Muffler
This machine must never be operated with
a faulty or missing spark arrestor or muf-
fler. Make sure the muffler is well secured
and in good condition. A worn or damaged
muffler is a fire hazard and may also cause
hearing loss.
Spark Plug
Keep the spark plug and wire connections
tight and clean.
WARNING!
Operating the engine without a muffler
or with a muffler that is damaged or im-
properly installed can increase engine
noise sufficiently to cause hearing loss.
Daily Maintenance
Prior to each work day, perform the follow-
ing:
WARNING!
Always wear gloves when
working around the cutter assembly.
n Remove all dirt and debris from the
engine, check the cooling fins and air
cleaner for clogging, and clean as neces-
sary. See Figure 16.
n Clean any debris or dirt from the hedge
trimmer cutter blades. Lubricate the
blades before use and after refueling.
Check the cutters for damage or incor-
rect adjustment.
Keep cooling
fins clean
n Check for loose or missing screws or
components. Make sure the cutter at-
tachment is securely fastened.
Keep air
passages
clean
n Check the entire machine for leaking
fuel or grease.
n Make sure nuts, bolts, and screws (ex-
cept carburetor adjusting screws) are
tight.
Figure 16
n Carefully remove any accumulations of
dirt or debris from the muffler and fuel
tank. Check cooling air intake area at
base of crankcase. Remove all debris.
Dirt build-up in these areas can lead to
engine overheating, fire, or premature
wear.
11
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Cutter Blade Adjustment
Adjust blades as follows (Figure 17):
Locknut
WARNING!
Guide Bar
1. Loosen all blade locknuts at least one
full turn.
The cutter blades are very sharp!
Always wear gloves when working
around the cutter assembly.
ꢀ. Tighten each blade shoulder bolt firmly,
and then loosen the shoulder bolts 1/4
to 1/ꢀ turn.
Cutter Blades
Washer
(should turn
freely)
3. Working from the gearcase end, lock
each bolt in place by firmly tightening
its locknut while preventing the shoul-
der bolt from turning.
Shoulder
Bolt
CAUTION!
Figure 17
Operating the trimmer with worn or
improperly adjusted cutters will reduce
cutter performance and may also dam-
age your machine.
When shoulder bolt adjustment is correct,
there should be a gap of
0.ꢀ5–0.50 mm between the cutter blades
and the flat washers, and the flat washer
beneath each bolt head should turn freely.
Cutting performance of your machine de-
pends a great deal on proper cutter blade
adjustment. Properly adjusted blades will
oscillate freely yet help prevent binding of
cut material between blades.
10-Hour Maintenance
(more frequently in dusty
conditions)
Unscrew
Fasteners
1. Remove the air cleaner cover by loosen-
ing the thumb screws and lifting up. See
Figure 18A.
Pre-Filter
ꢀ. Remove and inspect the pre-filter. If the
pre-filter is torn or otherwise damaged,
replace it with a new one. See Figure 18B.
3. Clean the pre-filter with soap and water.
Let dry before reinstalling.
Filter
Element
4. Inspect the air cleaner element. If the
element is damaged or distorted, re-
place it with a new one.
Figure 18A
5. Tap filter gently on a hard surface to
dislodge debris from element or use
compressed air from the inside to blow
debris out and away from the air filter
element.
Figure 18B
IMPORTANT!
CAUTION!
Never operate the unit if the air cleaner
assembly is damaged or missing!
Direct the air stream at the inside face of
the filter only!
6. Install the filter element, pre-filter and
cover in the reverse order of removal.
10/15-Hour Maintenance
CAUTION!
CAUTION!
Overlubricating can cause the gearbox
to operate sluggishly and can cause
grease to leak out.
Clean the spark
plug and check
the gap at the
electrode.
Before removing the spark plug, clean
the area around the plug to prevent dirt
and dust from getting into the engine’s
internal parts.
Every 10 to 15 hours
of operation:
Gearbox Grease
Fitting
n Remove and clean the spark plug.
See Figure 19. Adjust the spark plug
electrode gap to 0.0ꢀ4-inch (0.6 mm).
If the plug must be replaced, use only:
NGK CMR5H or equivalent.
0.024 inch
(0.6 mm)
Figure 19
n Lubricate the cutter assembly gear-
box by pumping one or two strokes
of lithium-base grease into the grease
fitting using a lever-type grease gun.
See Figure ꢀ0.
Figure 20
1ꢀ
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50-Hour Maintenance
Every 50 hours of operation
(more frequently in dusty or
dirty conditions):
n Remove and clean the cylinder cover
and clean dirt and debris from the cylin-
der cooling fins.
c. Slide the gearcase out of the tube.
n Use a wire hook to extract the fuel filter
from inside the fuel tank (Figure ꢀ3). In-
spect the fuel filter element. If it shows
signs of contamination from debris,
replace it with a genuine Shindaiwa
replacement fuel filter element. Before
reinstalling the filter, inspect the fuel
line. If you discover damage or deterio-
ration, the unit should be removed from
service until it can be inspected by a
Shindaiwa-trained service technician.
Using a grease gun, pump lithium-base
grease (about 10 grams) into the grease
fitting on the gearcase until you see old
grease being purged from the gearcase
(Figure ꢀꢀ). Purged grease will be
visible in the outer tube cavity. Clean
up excess grease, then reassemble the
gearcase onto the outer tube. Make sure
the index bolt fits into the hole on the
outer tube. Securely tighten both bolts.
n Lubricate the gearcase. To perform
this operation, first remove the gearcase
from the outer tube as follows:
Gearcase
Clamp Bolt
Outer Tube
Gearcase
Index Bolt
Figure 21
Gearcase
Grease Fitting
Hooked
Wire
Figure 22
CAUTION!
Servicing the fuel filter
Do not remove the D-shaped shim
washer from the gearcase clamp! The
shim washer prevents damage from
overtightening the tube clamp screw.
Figure 23
CAUTION!
Filter Element
Make sure you do not pierce the fuel
line with the end of the hooked wire.
The line is delicate and can be dam-
aged easily.
a. Loosen the gearcase clamp bolt.
b. Remove the index bolt from the
gearcase.
139/150-Hour Maintenance
Maintenance after first 139-hours,
then every 150-hours thereafter.
off just enough to allow gauge to slip
out with limited resistance.
5. While holding adjustment screw in
place with Allen driver, tighten locknut
with wrench.
n Combustion chamber should be decar-
bonized, and the valve clearance should
be adjusted. It is highly recommended
that this is done by a Shindaiwa-trained
service technician.
n Replace the spark plug annually: Use
only NGK CMR5H or equivalent resis-
tor type spark plug of the correct heat
range. Set spark plug electrode gap to
0.0ꢀ4-0.0ꢀ8 inch (0.6 -0.7 mm).
ꢀ. Loosen adjuster locknut so that the ꢀ.5
mm Allen socket head adjustment screw
can turn freely.
NOTE:
The NGK CMR5H also meets the require-
ments for electro magnetic compliance (EMC).
6. Turn engine over several times, and
return to TDC-compression. Recheck
with proper feeler gauge to make sure
clearance adjustment did not change as
a result of tightening locknut. Readjust
as necessary.
Valve Adjustment
1. Remove cylinder cover, rocker arm
cover, and set piston at TDC-compresion.
CAUTION!
7. Replace rocker arm cover gasket to as-
sure proper sealing and install cover.
n Performing a valve adjustment
incorrectly may cause hard starting
and/or can damage the engine.
3. Insert feeler gauge (.004” for both intake
and exhaust) between valve stem tip and
rocker arm.
IMPORTANT!
n If you are unfamiliar with this engine
or uncomfortable with this proce-
dure, consult with an authorized
Shindaiwa servicing dealer.
If new gasket is not available and/or old
gasket is not damaged, old gasket may
be reused. Never use cracked or dam-
aged gaskets!
4. Turn adjustment screw (clockwise =
tighter, counter-clockwise = looser)
until feeler gauge is almost snug. Back
13
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Spark Arrester Screen Maintenance
If the engine becomes sluggish and low on
power, check and clean the spark arrester
screen.
Engine Cover
Screws
Engine
Cover
WARNING!
Never operate the unit with a damaged
or missing muffler or spark arrester!
Operating with missing or damaged
spark arrester is a fire hazard and
could also damage your hearing.
Muffler
Muffler
Gasket
1. With a 3 mm hex wrench remove the
4 engine cover screws and the engine
cover. See Figure ꢀ4.
ꢀ. With a 4 mm hex wrench remove the
3 muffler bolts and the muffler. See
Figure ꢀ4.
Muffler Bolts
3. With a small flat bladed screwdriver
remove the ꢀ screws holding the
spark arrester screen and cover to
the muffler. See Figure ꢀ4.
Spark Arrester
Screen
Spark Arrester
Cover
Cover
Screws
4. Remove the screen and clean it with a
stiff bristle brush.
Figure 24
5. Inspect the cylinder exhaust port for
any carbon buildup.
6. Reassemble the spark arrester, muffler
and engine cover in the reverse order of
disassembly.
IMPORTANT!
If you note excessive carbon buildup,
consult your servicing dealer.
Long Term Storage
Whenever the machine will not be used
for 30 days or longer, use the following
procedures to prepare it for storage:
NOTE
n Remove the spark plug and pour about
1/4 ounce of oil into the cylinder
through the spark plug hole. Slowly pull
the recoil starter ꢀ or 3 times so oil will
evenly coat the interior of the engine.
Reinstall the spark plug.
Damage resulting from stale or contaminated
fuel is not covered by the Shindaiwa warranty
policy.
n Clean external parts thoroughly and
apply a light coating of oil to all metal
surfaces.
n Drain all the fuel from the carburetor
and the fuel tank.
n Before storing the machine, repair or
IMPORTANT!
All stored fuels should be stabilized with a
fuel stabilizer such as STA-BIL®.
CAUTION!
replace any worn or damaged parts.
n Remove the air cleaner element from
the carburetor and clean it thoroughly
with soap and water. Rinse and dry
thoroughly, then add a few drops of oil
and work it in. Reassemble.
Gasoline stored in the carbure-
tor for extended periods can cause
hard starting, and could also lead to
increased service and maintenance
costs.
n Store the machine in a clean, dust-free
area.
14
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Troubleshooting Guide
ENGINE DOES NOT START OR HARD TO START
What To Check
Possible Cause
Remedy
Faulty recoil starter.
Fluid in the crankcase.
Internal damage.
Does the engine crank?
NO
NO
NO
Consult with an authorized servicing dealer.
YES
Loose spark plug.
Tighten and re-test.
Good compression?
Excess wear on cylinder, piston, rings.
Valves not seating.
Consult with an authorized servicing dealer.
YES
Fuel incorrect, stale or contaminated;
mixture incorrect.
Refill with fresh, clean unleaded gasoline with
a pump octane of 87 or higher mixed with
a ꢀ-cycle air cooled mixing oil that meets or
exceeds ISO-L-EGD and/or JASO FC classified
oils at 50:1 gasoline/oil ratio.
Does the tank contain
fresh fuel of the proper
grade?
YES
Check for clogged fuel filter and/or vent. Replace fuel filter or vent as required; restart.
Is fuel visible and moving
in the return line when
priming?
NO
NO
Priming pump not functioning properly.
Consult with an authorized servicing dealer.
YES
The ignition switch is in “O” (OFF)
position.
Move switch to “I” (ON) position and restart.
Consult with an authorized servicing dealer.
Is there spark at the spark
plug wire terminal?
Shorted ignition ground.
Faulty ignition unit.
YES
If the plug is wet, excess fuel may be in
the cylinder.
Crank the engine with the plug removed,
reinstall the plug, and restart.
Check the spark plug.
The plug is fouled or improperly gapped. Clean and regap the plug to 0.0ꢀ4 - 0.0ꢀ8
inch (0.6 - 0.7 mm). Restart.
The plug is damaged internally or of the
wrong size.
Replace the plug with an NGK CMR5H or
equivalent resistor type spark plug of the
correct heat range. Set spark plug electrode
gap to 0.0ꢀ4-0.0ꢀ8 inch (0.6-0.7 mm).
15
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Troubleshooting Guide (continued)
LOW POWER OUTPUT
What To Check
Possible Cause
Remedy
Operator is overworking the unit.
Carburetor mixture is too lean.
Improper fuel ratio.
Cut at a slower rate.
Is the engine overheating?
Consult with an authorized servicing dealer.
Refill with fresh, clean unleaded gasoline with
a pump octane of 87 or higher mixed with
a ꢀ-cycle air cooled mixing oil that meets or
exceeds ISO-L-EGD and/or JASO FC classified
oils at 50:1 gasoline/oil ratio.
Fan, fan cover, cylinder fins dirty
or damaged.
Clean, repair or replace as necessary.
Carbon deposits on the piston or in
the muffler.
Consult with an authorized servicing dealer.
Clogged air cleaner element.
Loose or damaged spark plug.
Air leakage or clogged fuel line.
Water in the fuel.
Service the air cleaner element.
Tighten or replace.
Engine is rough at all
speeds. May also have
black smoke and/or
unburned fuel at the
exhaust.
Repair or replace filter and/or fuel line.
Replace the fuel. See page 8.
Piston seizure.
Faulty carburetor and/or diaphragm.
Consult with an authorized servicing dealer.
See above.
Valve clearance set incorrectly.
Overheating condition.
Engine is knocking.
Improper fuel.
Check fuel octane rating; check for presence of
alcohol in the fuel (pg. 8). Refuel as necessary.
Carbon deposits in the combustion
chamber.
Consult with an authorized servicing dealer.
Valve clearance set incorrectly.
16
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Troubleshooting Guide (continued)
ADDITIONAL PROBLEMS
Symptom
Possible Cause
Remedy
Clogged air filter.
Clean the air filter.
Poor acceleration.
Clogged fuel filter.
Lean fuel/air mixture.
Replace the fuel filter.
Consult with an authorized servicing dealer.
Adjust: 3,000 (5300) rpm (min-1)
Reset the switch and restart.
Idle speed set too low.
Switch turned off.
Engine stops abruptly.
Fuel tank empty.
Refuel. See page 8.
Clogged fuel filter.
Replace fuel filter.
Water in the fuel.
Drain; replace with clean fuel. See page 8.
Shorted spark plug or loose terminal.
Clean and replace spark plug, tighten
the terminal.
Ignition failure.
Piston seizure.
Replace the ignition unit.
Consult with an authorized servicing dealer.
Test and replace as required.
Ground (stop) wire is disconnected or
switch is defective.
Engine difficult to shut off.
Overheating due to incorrect spark plug. Idle engine until cool.
Clean and regap the plug to 0.024 - 0.028
inch (0.6 - 0.7 mm). Correct plug: NGK CMR5H
or equivalent resistor type spark plug of the
correct range.
Overheated engine.
Idle engine until cool.
Valve cover is leaking.
Consult with an authorized servicing dealer.
Top of engine is getting
dirty and oily.
Engine idle too high.
Set idle: 3,000 ( 300) rpm (min-1)
Cutting attachment
rotates at engine idle.
Broken clutch spring or worn clutch
spring boss.
Replace spring/shoes as required, check
idle speed.
Loose attachment holder.
Engine idle set too high.
Inspect and re-tighten holders securely.
Set idle: 3,000 ( 300) rpm (min-1)
Engine will not idle down.
Excessive vibration.
Engine has an air leak.
Consult with an authorized servicing dealer.
Inspect and replace attachment as required.
Tighten gearcase securely.
Warped or damaged cutting attachment.
Loose gearcase.
Bent main shaft/worn or damaged
bushings.
Inspect and replace as necessary.
Trimmer line not wound properly on spool. Rewind trimmer line.
Inspect and reinstall as required.
Shaft not installed in powerhead or
gearcase.
Cutting attachment will
not move.
Broken shaft.
Consult with an authorized servicing dealer.
Damaged gearcase.
17
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The following statement only applies to United States and its territories
Shindaiwa Corporation
Federal Emission Design And Defect Limited Warranty
Utility And Lawn And Garden Engines
Shindaiwa Corporation warrants to the initial purchaser and each
MAINTENANCE AND REPAIR REQUIREMENTS
subsequent owner, that this utility equipment engine (herein
engine) is designed, built and equipped to conform at the time of
initial sale, to all applicable regulations of the U.S. Environmental
Protection Agency (EPA), and that the engine is free of defects in
materials and workmanship that would cause this engine to fail
to conform with EPA regulations during its warranty period. This
emission warranty is applicable in all States, except the State of
California.
For parts listed under PARTS COVERED, the dealer authorized
by Shindaiwa Corporation will, at no cost to you, make the neces-
sary diagnosis, repair, or replacement of any defective emis-
sion-related component to ensure that the engine complies with
applicable U.S. EPA regulations.
You are responsible for the proper use and maintenance of the engine.
You should keep all receipts and maintenance records covering the
performance of regular maintenance in the event questions arise. These
receipts and maintenance records should be transferred to each subse-
quent owner of the engine. Shindaiwa Corporation reserves the right to
deny warranty coverage if the owner has not properly maintained the
engine. Shindaiwa Corporation will not deny warranty repairs, however,
solely because of the lack of repair, maintenance or failure to keep main-
tenance records.
MAINTENANCE,REPLACEMENTORREPAIROFEMISSIONCONTROL
DEVICESANDSYSTEMSMAYBEPERFORMEDBYANYREPAIRESTAB-
LISHMENT OR INDIVIDUAL; HOWEVER, WARRANTY REPAIRS MUST
BE PERFORMED BY A DEALER OR SERVICE CENTER AUTHORIZED
BY SHINDAIWA CORPORATION THE USE OF PARTS THAT ARE NOT
EQUIVALENTINPERFORMANCEANDDURABILITYTOAUTHORIZED
PARTS MAY IMPAIR THE EFFECTIVENESS OF THE EMISSION CON-
TROL SYSTEM AND MAY HAVE A BEARING ON THE OUTCOME OF
A WARRANTY CLAIM.
MANUFACTURERS WARRANTY COVERAGE
When sold within the U.S., this engine’s emission control system is
warranted for a period of two (ꢀ) years from the date this product is first
delivered to the original retail purchaser.
If other than the parts authorized by Shindaiwa Corporation are used
for maintenance replacements or for the repair of components affecting
emission control, you should assure yourself that such parts are war-
ranted by their manufacturer to be equivalent to the parts authorized by
Shindaiwa Corporation in their performance and durability.
OWNER’S WARRANTY RESPONSIBILITIES
As the engine owner, you are responsible for the performance of the
required maintenance listed in your owner’s manual. Shindaiwa Corpora-
tion recommends that you retain all receipts covering maintenance on
your engine, but Shindaiwa Corporation cannot deny a warranty claim
solely for the lack of receipts or for your failure to ensure the perfor-
mance of all scheduled maintenance.
As the engine owner, you should however be aware that Shindaiwa
Corporation may deny your warranty coverage if your engine or a part
has failed due to abuse, neglect, improper maintenance or unapproved
modifications.
You are responsible for presenting your engine to the nearest dealer
authorized by Shindaiwa Corporation when a problem exists.
If your Shindaiwa Dealer is unable to answer questions regarding your
warranty rights and responsibilities, you should then contact your
Shindaiwa Distributor.
For the name and telephone number of the Shindaiwa Distributor in your
area, please call Shindaiwa Inc. at (503) 69ꢀ-3070 between the hours of
8:00 AM and 5:00 PM Pacific Standard Time.
OBTAINING WARRANTY SERVICE
All repairs qualifying under this limited warranty must be performed by a
dealer authorized by Shindaiwa Corporation
If any emission-related part is found defective during the warranty
period, it is your responsibility to present the product to an authorized
Shindaiwa dealer. Bring your sales receipts showing the date of pur-
chase for this engine. The dealer authorized by Shindaiwa Corporation
will perform the necessary repairs or adjustments within a reasonable
amount of time and furnish you with a copy of the repair order. All parts
and accessories replaced under this warranty become the property of
Shindaiwa Corporation
To locate an authorized Shindaiwa dealer near you, contact your
Shindaiwa Distributor. For the name and telephone number of the
Shindaiwa Distributor in your area, please call Shindaiwa Inc. at (503)
69ꢀ-3070 between the hours of 8:00 AM and 5:00 PM Pacific Standard
Time.
PARTS COVERED
Listed below are the parts covered by the Federal Emission Design and
Defect Warranty. Some parts listed below may require scheduled main-
tenance and are warranted up to the first scheduled replacement of that
part. The warranted parts include:
1. Carburetor Internal Components
• Valve Assembly-throttle, Jet, Metering Diaphragm
ꢀ. Ignition System Components
THIS WARRANTY IS ADMINISTERED BY
Shindaiwa Inc.
11975 S.W. Herman Rd.
Tualatin OR. 9706ꢀ
(503) 69ꢀ-3070
• Ignition Coil
• Flywheel Rotor
The emission control system for your particular Shindaiwa engine may
also include certain related hoses and connectors.
LIMITATIONS
The Federal Emission Design and Defect Warranty shall not cover any of
the following:
(a) conditions resulting from tampering, misuse, improper adjust-
ment (unless they were made by the dealer or service center
authorized by Shindaiwa Corporation during a warranty repair),
alteration, accident, failure to use the recommended fuel and oil,
or not performing required maintenance services,
(b) the replacement parts used for required maintenance services,
(c) consequential parts used for required maintenance services,
(d) diagnosis and inspection fees that do not result in eligible war-
ranty service being performed, and
(e) any non-authorized replacement part, or malfunction of autho-
rized parts due to use of non-authorized parts.
18
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NOTES
19
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Shindaiwa Inc.
11975 S.W. Herman Rd.
Tualatin, Oregon 9706ꢀ USA
Telephone: 503 69ꢀ-3070
Fax:
503 69ꢀ-6696
Shindaiwa Corporation
Head Office:
6-ꢀ-11, Ozuka-Nishi
Asaminami-Ku, Hiroshima
731-3167, Japan
Telephone: 81-8ꢀ-849-ꢀꢀꢀ0
Fax:
81-8ꢀ-849-ꢀ481
© ꢀ007 Shindaiwa, Inc.
Part Number 68800-94313
Revision 3/07
Printed in Japan
Shindaiwa Tornado is a trademark,
and Shindaiwa is a registered trademark
of Shindaiwa, Inc.
Specifications subject to change without notice.
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