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Gearcase Lubrication
VIEWED FROM THE BOTTOM
Gearcase Grease Fitting
CAUTION!
n Over-lubricating may cause the
gearcase to run slower than normal,
and may also cause leakage from
excess grease.
Every 20 Hours
Figure 21
VIEWED FROM
THE BOTTOM
Gearcase
Cover
Figure 20
Top off gearcase grease level by using a le-
ver-type grease gun to force 1–2 strokes of
high quality lithium-based grease through
the gearcase grease fitting.
Every 100 Hours
(or before long-term storage)
139-Hour or Annual Maintenance
NOTE:
The NGK CMR5H also meets the require-
ments for electro magnetic compliance (EMC).
Valve Adjustment
1.
Remove cylinder cover, rocker arm cover,
and set piston at TDC-compression.
2. Loosen adjuster locknut so that the
2.5 mm Allen socket head adjustment
screw can turn freely.
3. Insert feeler gauge .004 (0.10 mm) for
both intake and exhaust; between valve
stem tip and rocker arm.
7. Replace rocker arm cover gasket to as-
sure proper sealing and install cover.
IMPORTANT!
If new gasket is not available and/or old
gasket is not damaged, old gasket may be
reused. Never use cracked or damaged
gaskets!
CAUTION!
n Performing a valve adjustment
incorrectly may cause hard starting
and/or can damage the unit. Refer to
the C4 Service Manual for complete
valve adjustment procedure and
torque specications.
n If you are unfamiliar with this engine
or uncomfortable with this proce-
dure, Consult with an authorized
Shindaiwa servicing dealer.
4. Turn adjustment screw (clockwise =
tighter, counter-clockwise = looser) until
feeler gauge is almost snug. Back 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.
6. Turn engine over several times, and return
to TDC-compression. Recheck with proper
feeler gauge to make sure clearance adjust-
ment did not change as a result of tighten-
ing locknut. Readjust as necessary.
Figure 23
Figure 24
Figure 25
Maintenance after rst 139-hours,
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.
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
0.6 -0.7 mm.
HT2510_20
Blades
Standard blades require no periodic adjust-
ments. Make sure all blade shoulder bolts
are tight and in good condition.
n Clean blades and apply a light coating of
oil to all metal surfaces. Vegetable oils
may be used to protect sensitive plants
from spotting.
Locknut
Cutters
Socket Head
Shoulder Bolt
Plate
Guide Bar
Figure 22
Spacer
Remove the gearcase cover, and use
solvent and a soft brush to remove all
old grease from the gearcase. To refill,
hand-pack the gearcase with approximately
40–50 grams of high quality lithium-based
grease (50–70% of capacity). DO NOT
OVERFILL!
Figure 23
Figure 25