Maintenance (continued)

135 hour maintenance (cont.)

Valve Adjustment

1.Remove cylinder cover, rocker arm cover, and spark plug. Rotate the crankshaft while observing the piston through the spark plug opening. When the piston is at the top of the compression stroke (TDC), the valves can be adjusted.

CAUTION!

■■Performing a valve adjustment incorrectly may cause hard starting and/or can damage the engine.

■■If you are unfamiliar with this engine or uncomfortable with this procedure, consult with an authorized Shindaiwa servicing dealer.

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

3.Insert 0.10 mm (0.004”) feeler gauge 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 the adjustment screw in place with the Allen driver, tighten the locknut with a 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 the locknut. Readjust as necessary.

7.Replace rocker arm cover gasket to assure proper sealing and install cover.

IMPORTANT!

If a new gasket is not available and/ or the old gasket is not damaged, the old gasket may be reused. Never use cracked or damaged gaskets!

300-hour maintenance

Gearcase Lubrication

The gearcase should be filled with 60 cc (2.0 fl.oz.) of Mobil SHC634 Synthetic

Gear Oil. A maximum of 75-80 cc can be used, but never to exceed 80 cc. Opera- tion with excessive oil level will result

in high operating temperatures. Do not

overfill!

WARNING!

BURN DANGER! The gearcase will be extremely hot after use!

Replacing the gearcase oil

1.Disconnect spark plug wire at engine.

2.Remove the LH Drum and axle assembly (as viewed from the operat- ing position). Wipe the sideplate clean and remove four screws (it

is not necessary to remove the gearcase from the outer tube).

3.Turn gearcase side plate to break the seal and lift the plate from the gearcase.

Turn gearcase side plate to break the seal and lift the plate from the gearcase

NOTE:

It may be necessary to use a heat gun to soften the sealer material.

4.Turn the gearcase to the LH side and and allow all used gearcase oil to drain into a small container.

5.Place the gearcase on the RH side and supported so the outer tube is parallel to the ground. Refill the gearcase with 60 cc (2.0 fl.oz) of

Mobil SHC634 Synthetic Gear Oil to the bottom of the chamfer on the output gear. The correct oil depth is 5/8" (15.5 mm). DO NOT OVERFILL!

Fill the gearcase to the bottom of the

chamfer on the output gear.

DO NOT OVERFILL!

6.Inspect the sideplate for damage and clean off all remaining liquid gasket material with brake cleaner or ace- tone. Coat the outer sealing flange of the sideplate with silicon sealant.

7.Replace the cover and install the four sideplate screws. Tighten securely.

8.Reinstall the drum and axle assem- bly. Refer to the section “Assembly: Sweeper Assembly” for instructions.

15

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Shindaiwa X7502891100 manual Hour maintenance Valve Adjustment, Hour maintenance Gearcase Lubrication, Overfill
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X7502891100 specifications

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