Shindaiwa 81650 Gearcase Lubrication, Hour or Annual Maintenance, Every 20 Hours, Every 100 Hours

Gearcase Lubrication

Every 20 Hours

Gearcase Grease Fitting

Figure 20 VIEWED FROM THE BOTTOM

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)

VIEWED FROM

THE BOTTOM

Gearcase

Cover

Figure 21

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!

CAUTION!

nOver-lubricating may cause the gearcase to run slower than normal, and may also cause leakage from excess grease.

Blades
Guide Bar		Locknut
		HT2510_20
Cutters		Plate
Spacer Socket Head
Figure 22	Shoulder Bolt

Standard blades require no periodic adjust- ments. Make sure all blade shoulder bolts are tight and in good condition.

nClean blades and apply a light coating of oil to all metal surfaces. Vegetable oils may be used to protect sensitive plants from spotting.

139-Hour or Annual Maintenance

Maintenance after first 139-hours, then every 150-hours thereafter.

nCombustion 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.

nReplace 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.

NOTE:

The NGK CMR5H also meets the require- ments for electro magnetic compliance (EMC).

CAUTION!

nPerforming 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 specifications.

nIf you are unfamiliar with this engine or uncomfortable with this proce- dure, Consult with an authorized Shindaiwa servicing dealer.

Valve Adjustment

1.Remove cylinder cover, rocker arm cover, and set piston at TDC-compression.

Figure 23

2.Loosen adjuster locknut so that the 2.5 mm Allen socket head adjustment screw can turn freely.

Figure 24

3.Insert feeler gauge .004 (0.10 mm) for both intake and exhaust; between valve stem tip and rocker arm.

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 25

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!

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