SHINDAIWA OWNER’S/OPERATOR’S MANUAL
AH2510 ARTICULATED
HEDGE TRIMMER
WARNING!
Always wear eye and ear protection when
operating this machine! To minimize the risk of
injury to yourself and others, read this manual
and familiarize yourself with its contents.
Part Number 62640-94313 Rev. 3/07
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Safety Equipment and Labels
Shaft
Safety Label
Cutter Blade
Scabbard
Hand
Guard
Stop
IMPORTANT!
Switch
Caution, Danger, Warning, and
Operation Information Labels:
Make sure all information labels are
undamaged and readable. Immedi-
ately replace damaged or missing
information labels. New labels are
available from your local authorized
Shindaiwa dealer.
Throttle
Interlock
High Voltage Label
Figure 1
Operating Precautions
WARNING!
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 Never transport the articulated
hedge trimmer nor set it down with
the engine running. An engine that’s
running could be accidently acceler-
ated causing the blades to oscillate.
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 Make sure the cover is in place
when transporting the articulated
hedge trimmer.
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 there are no missing or
loose fasteners, and that the stop
switch and throttle controls are
working properly.
n When carrying the articulated hedge
trimmer by hand, the cutter attach-
ment should be pointing backward
with the cutter blade in the retracted
or transporting position (see page 7
for articulating adjustment proce-
dures).
n Stop the machine immediately if it
suddenly begins to vibrate or shake.
Inspect for broken, missing or
improperly installed parts or attach-
ments.
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 Make sure the cutters are correctly
adjusted before operating the articu-
lated hedge trimmer (see page 12
for cutter adjustment procedures).
Never attempt cutter adjustment
with the engine running!
n Do not operate the articulated
hedge trimmer with the muffler
removed.
n Always make sure the cutter attach-
ment is properly installed and firmly
tightened before operation.
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 Make sure there is always good
ventilation when operating the
articulated hedge trimmer. Fumes
from engine exhaust can cause
serious injury or death. Never run
the engine indoors!
n Before starting the engine, make
sure the cutter is not contacting
anything.
3
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Operating the Articulated Hedge Trimmer
CAUTION!
n Always maintain the articulated
hedge trimmer according to this
Always wear a hard hat to reduce
the risk of head injuries during
operation of this machine.
owner’s manual and follow the
recommended scheduled mainte-
nance.
n Never modify or disable any of
the hedge trimmer’s safety de-
vices.
Always wear eye and hearing
protection. Shindaiwa recommends
wearing a face shield as additional
face and eye protection.
Secure long hair
so it is above
shoulder level.
n Always use genuine Shindaiwa
parts and accessories when
repairing or maintaining this ma-
chine.
Always operate with
both hands firmly
gripping the machine.
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.
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 When transporting the hedge
trimmer 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.
n Always clear your work area of
trash or hidden debris to help
ensure good footing.
n Keep the cutters sharp and prop-
erly adjusted.
Keep bystanders at least 50 feet
(15 meters) away from the
operating trimmer to reduce the
risk of being struck by falling
objects or thrown debris.
n Keep the articulated hedge trim-
mer 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 recommend-
ed. Never operate machine
bare-footed.
Figure 3
Figure 2
4
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Product Description
Prior To Assembly
Using Figure 4 as a guide, familiarize your-
self with the Shindaiwa AH2510 articulated
hedge trimmer and its various compo-
nents. Understanding your machine helps
ensure top performance, longer service
life, and safer operation.
Air Filter
Spark
Assembly
Plug
Hedge Trimmer Cutter
Assembly
Cutter Assembly
Adjustment Lever
Stop Switch
Before assembling, make sure you have all
the components required for a complete
unit:
Outer
Tube
n Engine assembly
Fuel Tank
n Outer tube/cutter assembly
Cutter Blade
Scabbard
Throttle
Trigger
Fuel Tank Guard
n Kit with this manual and tool kit for
Powerhead Assembly
routine maintenance.
Hand
Guard
Handle
Grip
n Cutter blade scabbard
Carefully inspect all components for
damage.
Hedge Trimmer
Cutter Assembly
Latch Lock
AH231_07
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
Gearcase
Figure 4
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
Model Name............................................................................AH2510
Engine Model........................................................................ SF2510E
Engine Type .............................4-cycle, vertical cylinder, air cooled
Dry Weight .................................................................14.0 lbs./6.3 kg
Bore x Stroke.............................................. 34 x 27 mm/1.34 X 1.06”
Displacement.......................................................... 24.5 cc/1.5 cu. in.
Carburetor .......................................... Walbro WYL diaphragm type
Ignition System ...................... Fully electronic, program controlled
Spark Plug..................................................................... NGK CMR5H
Air Filter.......Non-reversible, heavy-duty, two -stage filter element
Starting Method............................................................ Recoil starter
Stopping Method..............................................................Slide switch
Cooling System ...................................................................Forced air
-1
Engine Speed at Maximum Power Output..........7,500 rpm (min )
Maximum Power Output.............................................1.1 hp/0.8 kW
Transmission Type .............................Automatic, centrifugal clutch
with bevel gear
-1
Engine Speed at Idling ..........................................3,000 rpm (min )
Blade Length ............................................................. 22.3 in/567 mm
Cutter Drive..........................................................................Spur gear
Gear Lubricant................................................. Lithium based grease
-1
Maximum Engine Speed.....................................10,500 rpm (min )
Fuel/Oil Ratio..........................................50:1 with Premium 2-cycle
air cooled mixing oil
Fuel Tank Capacity .......................................................590 ml/20 oz.
Standard Equipment: Tool kit containing a spark plug wrench,
4 mm hex wrench, and 8 x 10 mm spanner
Optional Equipment: Harness and bracket
Specifications are subject to change without notice.
5
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Assembly: AH2510
Spark Plug
Tube Clamp
Clamp Screw
Mainshaft
Outer Tube
Grip
Hex
Wrench
Trigger
Housing
Figure 6
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
mainshaft splines engage with the
powerhead.
Tube
Clamp
4. Position the outer tube so that the
gearcase output shaft is facing left on
muffler cover.
Figure 5
Connect the Outer Tube
to the Powerhead.
CAUTION!
Do not force the shaft tube into the
powerhead! Excessive force can dam-
age the shaft tube and mainshaft.
5. Slide the outer tube into the powerhead
until the throttle grip just contacts the
tube clamp.
1. Place the powerhead on a clean, flat
surface, spark plug facing up.
6. Tighten the clamp screw firmly.
2. Use the 4 mm hex wrench to loosen the
tube clamp screw.
Throttle Cable
Connect the Throttle Cable
Connect the throttle
cable
1. Loosen the air cleaner cover knob
and remove the air cleaner cover.
See Figure 7.
Throttle
Cable
Filter
Cover
Cable
Adjuster
2. Slip the throttle cable into the cable
adjuster and hook the bullet end of the
cable onto the swivel. See Figure 8.
Connect the Ignition Leads
3. Connect the two ignition wires by
pushing the bullet connectors together.
See Figure 9.
Cable Swivel
4. Reinstall the air cleaner cover.
Figure 7
Figure 8
CAUTION!
Routing of wiring must not interfere
with throttle or choke operation.
Ignition
Lead
Figure 9
6
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Assembly: Adjust Throttle Lever Free Play
The throttle lever free play should be ap-
proximately 3/16-1/4 inch (4-6 mm). See
Figure 10. Make sure that the throttle
lever operates smoothly without binding.
If it becomes necessary to adjust the lever
free play, follow the procedures and illus-
trations that follow.
3. Turn the cable adjuster in or out as
required to obtain proper free play
3/16-1/4 inch (4-6 mm). See Figure 12.
4. Tighten the locknut.
Cable
Adjuster
Lock
Nut
Figure 11
1. Loosen the air cleaner cover knob
3/16-1/4 inch (4-6
mm) Throttle Free
play
and remove the air cleaner cover.
See Figure 11.
Figure 12
2. Loosen the lock nut on the cable ad-
juster. See Figure 12.
Figure 10
5. Reinstall the air cleaner cover.
Adjusting the Hedge Trimmer Cutter Assembly
4. Release the latch lock and the latch
release. Make sure the latch lock and
the latch release return securely to a
locking position.
2. With the index finger of your left hand,
WARNING!
press the latch release. With your left
thumb, press the latch lock.
n The cutter blades are very sharp.
See Figure 14.
Do not grasp the blades with your
hands. Do not brush the blades
against your body.
5. Remove the scabbard from the cutter
blade. The engine now may be started.
Latch Release
n Never run the engine nor operate
the articulated hedge trimmer when
the cutter assembly is in the stor-
age/transport position.
Adjusting the Hedge Trimmer Cut-
ter Assembly for Desired Cutting
Angles
Various blade
positions possible
270°
IMPORTANT!
Always use gloves when working near
the cutter assembly.
120°
Position the hedge trimmer on a flat, level
surface with the engine resting on the fuel
tank guard. Make sure the scabbard is in
place on the blade.
The cutter assembly
can be adjusted to 10
different positions rang-
ing from 120° to 270°
from the outer tube as
shown in Figure 14.
Refer to the steps on the
previous page for adjust-
ment procedures. Al-
ways make sure the lock
latch is securely locked
after each adjustment.
Latch Lock
1. With your right hand, grasp the handle,
located immediately behind the hand
Figure 14
guard. With your left hand, grip the ad-
justment lever on the cutter assembly.
See Figure 13.
3. While holding the latch lock down, pivot
the cutter assembly using the adjust-
ment lever until it is straight with the
outer tube (pivot 180°).
IMPORTANT!
The latch lock provides an interlock to
help prevent inadvertent depression of
the latch release.
See Figure 15.
Adjustment Lever
Figure 16
Adjustment Lever
WARNING!
Do not touch the cutter blades when
the engine is running. The blades can
oscillate even if the engine is idling.
Figure 15
Figure 13
7
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Adjusting the Hedge Trimmer Cutter Assembly (continued)
Gearcase rotated to the
Adjusting the Cutter Assembly for
Storage or Transportation
1. With the engine off, install the scabbard
onto the blade.
storage/transportation position
2. Using the procedures described on the
previous page, rotate the cutter assem-
bly so it is parallel to the tube. Make
sure the latch lock and the latch release
return securely to a locking position.
See Figure 17.
WARNING!
Never run the engine when adjusting
the cutter assembly to the storage
position.
3. Make sure the scabbard is in place on
the cutters before storing or transporting.
Figure 17
Mixing Fuel
CAUTION!
CAUTION!
Examples of 50:1 mixing quantities
n 1 gallon of gasoline to 2.6 oz. mixing oil.
n 5 liters of gasoline to 100 ml. mixing oil.
n Some types of gasoline contain al-
cohol as an oxygenate. Oxygenated
gasoline may cause increased op-
erating temperatures. Under certain
conditions, alcohol-based gasoline
may also reduce the lubricating
This engine is designed to operate on
a 50:1 mixture consisting of unleaded
gasoline and ISO-L-EGD or JASO FC
class 2-cycle mixing oil only. Use of
non-approved mixing oils can lead to
excessive carbon deposits.
IMPORTANT!
Mix only enough fuel for your immediate
needs! If fuel must be stored longer than
qualities of some 2-cycle mixing oils.
30 days and
oil with fuel stabilizer
n Use only fresh, clean unleaded gasoline
n Never use any type of gasoline
containing more than 10% alcohol
by volume! Generic oils and some
outboard oils may not be intended
for use in high-performance 2-cycle
type engines, and should never be
used in your Shindaiwa engine.
is not used, it should first be treated with
a fuel stabilizer such as STA-BIL™.
with a pump octane of 87 or higher.
n Mixed with 50:1 Shindaiwa ISO-L-EGD
or JASO FC class 2-cycle mixing oil at a
gasoline/ratio of 50:1 (1 gallon of gaso-
line to 2.6 ozs mixing oil). Shindaiwa
One meets or exceeds these require-
ments.
Oil is a registered JASO FC
classified oil and also meets or exceeds
ISO-L-EGD performance requirements.
Shindaiwa One is recommended for use
in all Shindaiwa low emissions engines.
Shindaiwa One also includes a fuel
stabilizer.
Filling the Fuel Tank
1. Place the unit on a flat, level surface.
WARNING!
2. Clear any dirt or other debris from
around the fuel filler cap.
Minimize the Risk of Fire!
n ALWAYS stop the engine and al-
low it to cool before refueling. Avoid
overfilling and wipe off any fuel that
may have spilled.
3. Remove the fuel cap, and fill the tank
with clean, fresh fuel.
4. Reinstall the fuel filler cap and tighten
firmly.
n Wipe all spilled fuel and move the
engine at least 10 feet (3 meters)
from the fueling point and source
before restarting!
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 ma-
terial 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!
When the Engine Starts...
Engine ignition is controlled by a two
position switch mounted on the throttle
housing labeled, "I" for ON or START and
"O" for OFF or STOP.
n After the engine starts, allow the engine
to warm up at idle 2 or 3 minutes before
operating the unit.
Make sure
the cutting
attachment
is clear of
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).
obstructions!
ON
Throttle Lock
Button
Figure 21
IMPORTANT!
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.
Figure 18
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 18.
2. Set the throttle lever to the “fast idle”;
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
Starting A Flooded Engine
button, release the throttle lever.
See Figure 18.
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!
2. Slide the ignition switch to the “O”
(STOP) position.
When the engine starts or is running–
even at idle–the hedge trimmer cutter
blade may move (oscillate). Keep
your hands and your body away from
the cutter assembly while starting the
engine!
Primer Bulb
n If the spark plug is fouled or soaked
with fuel, clean the plug as necessary.
Figure 19
3. Open the choke (Figure 22) 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.
3. Press the primer bulb until fuel can be seen
flowing in the transparent return tube.
IMPORTANT!
5. When the engine starts, slowly move
the choke lever to the "OPEN" position.
See Figure 22. (If the engine stops after
the initial start, close the choke and
restart.)
The primer system only pushes fuel
through the carburetor. Repeatedly
pressing the primer bulb will not flood the
engine with fuel.
Open
4. Set the choke
lever to the
Closed
CLOSED posi-
tion if engine
is cold.
Figure 20
Figure 22
WARNING!
Never start the engine from the
operating position.
9
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Stopping the Engine
Idle the engine briefly before stopping
(about 2 minutes), then slide the ignition
switch to the “O” (Engine OFF) position.
OFF
Figure 23
Adjusting Engine Idle
Idle Speed Adjustment
3. If a tachometer is available, the engine idle
speed should be final adjusted to 3,000
( 300) rpm (min-1).
WARNING!
NOTE:
The cutting attachment must NEVER
oscillate at engine idle! If the idle speed
cannot be adjusted by the procedure
described here, return the unit to your
Shindaiwa dealer for inspection.
Carburetor fuel mixture adjustments are
preset at factory and cannot be serviced in
the field.
1. Place the unit on the ground and start
the engine, then allow it to idle 2-3 min-
utes until warm.
Idle Adjusting
Figure 24
Screw
2. If the cutting attachment oscillates
when the engine is at idle, reduce
the idle speed by turning the idle
adjustment screw counter-clockwise.
See Figure 24.
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.
10
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General Maintenance
NOTE:
IMPORTANT!
Using non-standard replacement parts
could invalidate your Shindaiwa warranty.
MAINTENANCE, REPLACEMENT, OR
REPAIR OF EMISSION CONTROL
DEVICES AND SYSTEM MAY BE PER-
FORMED BY ANY REPAIR ESTABLISH-
MENT OR INDIVIDUAL. HOWEVER,
WARRANTY REPAIRS MUST BE PER-
FORMED BY A DEALER OR SERVICE
CENTER AUTHORIZED BY SHINDAIWA
CORPORATION AND USE OF PARTS
THAT ARE NOT EQUIVALENT IN PER-
FORMANCE AND DURABILITY TO AU-
THORIZED PARTS MAY IMPAIR THE
EFFECTIVENESS OF THE EMISSION
CONTROL SYSTEM AND MAY HAVE A
BEARING ON THE OUTCOME OF THE
WARRANTY CLAIM.
WARNING!
Before performing any maintenance,
repair, or cleaning work on the ma-
chine, make sure the engine and
cutting attachment are completely
stopped. Disconnect the spark plug
wire before performing service or main-
tenance work.
Spark Plug
Keep the spark plug and wire connections
tight and clean.
Fasteners
Make sure nuts, bolts, and screws (except
carburetor adjusting screw) are tight.
WARNING!
Non-standard parts may not operate
properly with your unit and may cause
damage and lead to personal injury.
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.
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
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.
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.
n Check for loose or missing screws or
components. Make sure the cutter at-
tachment is securely fastened.
following:
n Remove all dirt and debris from the
engine, check the cooling fins and air
cleaner for clogging, and clean as nec-
essary. See Figure 25.
Keep cooling
WARNING!
fins clean
n Check the entire machine for leaking
fuel or grease.
Always wear gloves when working
around the cutter assembly.
n Make sure nuts, bolts, and screws (ex-
cept carburetor adjusting screws) are
tight.
Keep air
passages
clean
Figure 25
11
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Cutter Blade Adjustment
Cutter performance of your machine
depends in great measure on cutter blade
clearance. Properly adjusted blades will
oscillate freely yet help prevent binding of
cut material between blades. Adjust blades
as follows (Figure 26):
When shoulder bolt adjustment is cor-
rect, there should be a gap of 0.25–0.50
mm between the cutter blades and the flat
washers, and the flat washer beneath each
bolt head should turn freely.
WARNING!
The cutter blades are very sharp!
Always wear gloves when working
around the cutter assembly.
Locknut
1. Loosen all blade locknuts at least one
full turn.
Guide Bar
CAUTION!
2. Tighten each blade shoulder bolt firmly,
and then loosen the shoulder bolts 1/4
to 1/2 turn.
Operating the trimmer with worn or
improperly adjusted cutters will reduce
cutter performance and may also dam-
age your machine.
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
Figure 26
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 27A.
Pre-Filter
2. Remove and inspect the pre-filter. If the
pre-filter is torn or otherwise damaged,
replace it with a new one. See Figure 27B.
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 27A
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 27B
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!
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.
Over lubricating can cause the gear-
box to operate sluggishly and can
cause grease to leak out.
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 0.024 inch (0.6 mm).
If the plug must be replaced, use only:
NGK CMR5H or equivalent.
0.024 inch
(0.6 mm)
251030
Figure 28
n Lubricate the cutter assembly gear-
box by pumping one or two strokes of
lithium-base grease into the grease fit-
ting using a lever-type grease gun. See
Figure 29.
Figure 29
12
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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. Using n Use a wire hook to extract the fuel
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
31). 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.
filter from inside the fuel tank (Figure
32). Inspect the fuel filter element. If it
shows signs of contamination from de-
bris, 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.
n Lubricate the gearcase. To perform
this operation, first remove the gearcase
from the outer tube as follows:
Gearcase
Outer Tube
Clamp Bolt
Gearcase
Figure 30
Index Bolt
Hooked
Wire
Gearcase
Grease Fitting
CAUTION!
Figure 31
Do not remove the D-shaped shim
washer from the gearcase clamp! The
shim washer prevents damage from
overtightening the tube clamp screw.
Servicing the fuel filter
Figure 32
Filter Element
CAUTION!
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,
feeler gauge is almost snug. Back off
just enough to allow gauge to slip out
with limited resistance.
then every 150-hours thereafter.
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.
5. While holding adjustment screw in
place with Allen driver, tighten locknut
with wrench.
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.
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
0.024-0.028 inch (0.6 -0.7 mm).
Valve Adjustment
1. Remove cylinder cover, rocker arm cover,
and set piston at TDC-compression.
7. Replace rocker arm cover gasket to as-
sure proper sealing and install cover.
NOTE:
2. Loosen adjuster locknut so that the 2.5
mm Allen socket head adjustment screw
can turn freely.
The NGK CMR5H also meets the require-
ments for electro magnetic compliance (EMC).
CAUTION!
n Performing a valve adjustment
incorrectly may cause hard starting
and/or can damage the unit. Refer
to the C-4 Service Manual for com-
plete valve adjustment procedure
and torque specifications.
n If you are unfamiliar with this engine
or uncomfortable with this proce-
dure, Consult with an authorized
Shindaiwa servicing dealer.
IMPORTANT!
3. Insert feeler gauge .004” (0.10 mm) for
both inkake and exhaust; between valve
stem tip and rocker arm.
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
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 33.
2. With a 4 mm hex wrench remove the
3 muffler bolts and the muffler. See
Figure 33.
Muffler Bolts
3. With a small flat bladed screwdriver
remove the 2 screws holding the
spark arrester screen and cover to
the muffler. See Figure 33.
Spark Arrester
Screen
Spark Arrester
Cover
Cover
Screws
4. Remove the screen and clean it with a
stiff bristle brush.
Figure 33
5. Inspect the cylinder exhaust port for
any carbon buildup.
IMPORTANT!
If you note excessive carbon buildup,
consult with an authorized Shindaiwa
servicing dealer.
6. Reassemble the spark arrester, muffler
and engine cover in the reverse order of
disassembly.
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 2 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
CAUTION!
replace any worn or damaged parts.
IMPORTANT!
All stored fuels should be stabilized with a
fuel stabilizer such as STA-BIL™.
Gasoline stored in the carbure-
tor for extended periods can cause
hard starting, and could also lead to
increased service and maintenance
costs.
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.
n Store the machine in a clean, dust-free
area.
14
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Troubleshooting Guide
ENGINE DOES NOT START
What To Check
Possible Cause
Remedy
Faulty recoil starter.
NO
Does the engine crank?
Fluid in the crankcase.
Internal damage.
Consult with an authorized servicing dealer.
YES
Loose spark plug.
Tighten and re-test.
NO
NO
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 2-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.
Priming pump not functioning properly.
Replace fuel filter or vent as required; restart.
Consult with an authorized servicing dealer.
Is fuel visible and moving in the
return line when priming?
NO
NO
YES
The ignition switch is in “O” (OFF) position.
Shorted ignition ground.
Move switch to “I” (ON) position and re-start.
Consult with an authorized servicing dealer.
Is there spark at the spark plug
wire terminal?
YES
Faulty ignition unit.
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 0.024 - 0.028 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 range. Set
spark plug electrode gap to 0.024 - 0.028 inch
(0.6-0.7 mm).
LOW POWER OUTPUT
What To Check
Possible Cause
Remedy
Cut at a slower rate.
Operator is overworking the unit.
Carburetor mixture is too lean.
Improper fuel ratio.
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 2-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.
Carbon deposits on the piston or in the muffler.
Clogged air cleaner element.
Loose or damaged spark plug.
Air leakage or clogged fuel line.
Water in the fuel.
Clean, repair or replace as necessary.
Consult with an authorized servicing dealer.
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 fuel filter and/or fuel line.
Replace the fuel. See page 8.
Piston seizure.
Faulty carburetor and/or diaphragm.
Valve clearance set incorrectly.
Overheating condition.
Consult with an authorized servicing dealer.
See above.
Engine is knocking.
Improper fuel.
Check fuel octane rating; check for presence of
alcohol in the fuel (page 8). Refuel as necessary.
Carbon deposits in the combustion chamber.
Valve clearance set incorrectly.
Consult with an authorized servicing dealer.
15
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Troubleshooting Guide (continued)
ADDITIONAL PROBLEMS
Possible Cause
Symptom
Remedy
Clogged air filter.
Clean the air filter.
Poor acceleration.
Clogged fuel filter.
Lean fuel/air mixture.
Idle speed set too low.
Switch turned off.
Replace the fuel filter.
Consult with an authorized servicing dealer.
Adjust: 3,000 ( 300) RPM (min-1).
Reset the switch and restart.
Engine stops abruptly.
Fuel tank empty.
Refuel. See page 8.
Clogged fuel filter.
Water in the fuel.
Replace fuel filter.
Drain; replace with clean fuel. See page 8.
Clean or replace spark plug, tighten the terminal.
Replace the ignition unit.
Shorted spark plug or loose terminal.
Ignition failure.
Piston seizure.
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).
Replace spring/shoes as required, check idle speed.
Inspect and re-tighten holders securely.
Set idle: 3,000 ( 300) RPM (min-1).
Consult with an authorized servicing dealer.
Inspect and replace attachment as required.
Tighten gearcase securely.
Cutting attachment rotates at
engine idle.
Broken clutch spring or worn clutch spring boss.
Loose attachment holder.
Engine idle set too high.
Engine will not idle down.
Excessive vibration.
Engine has an air leak.
Warped or damaged cutting attachment.
Loose gearcase.
Bent main shaft/worn or damaged bushings.
Trimmer line not wound properly on spool.
Shaft not installed in powerhead or gearcase.
Broken shaft.
Inspect and replace as necessary.
Rewind trimmer line.
Inspect and reinstall as required.
Cutting attachment will
not rotate.
Consult with an authorized servicing dealer.
Damaged gearcase.
16
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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 (2) 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) 692-3070 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)
692-3070 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:
THIS WARRANTY IS ADMINISTERED BY
Shindaiwa Inc.
11975 S.W. Herman Rd.
Tualatin OR. 97062
(503) 692-3070
1. Carburetor Internal Components
• Jet, Diaphragm Assembly-Metering
2. Ignition System Components
• 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.
17
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NOTES
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NOTES
19
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Shindaiwa Inc.
11975 S.W. Herman Rd.
Tualatin, Oregon 97062 USA
Telephone: 503 692-3070
Fax:
503 692-6696
Shindaiwa Corporation
Head Office:
6-2-11, Ozuka-Nishi
Asaminami-Ku, Hiroshima
731-3167, Japan
Telephone: 81-82-849-2220
Fax:
81-82-849-2481
©2007 Shindaiwa, Inc.
Part Number 62640-94313
Revision 3/07
Shindaiwa is a registered trademark
of Shindaiwa, Inc.
Specifications subject to change without notice.
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