Service & Adjustments, Servicing Blade

SERVICE & ADJUSTMENTS

Servicing Blade

To Remove Blade

•Remove the bolt and blade bell support which hold the blade and adapter to the engine crankshaft. See Figure 16.

•Remove the blade and adapter from the crankshaft.

To Replace Blade:

•Before reinstalling the blade and the blade adapter to the unit, lubricate the engine crankshaft and the inner surface of the blade adapter with light oil.

•Install the blade adapter on the crankshaft with the “star” away from the engine. See Figure 16.

Blade Adapter

Crankshaft

To Sharpen Blade:

The blade can be sharpened with a file or on a grinding wheel. Do not attempt to sharpen while on the mower.

•Follow the original angle of grind as a guide. Make sure that each cutting edge receives an equal amount of grinding to prevent an

unbalanced blade.

NOTE: An unbalanced blade will cause excessive vibration when rotating at high speeds, may cause damage to the mower and could break, causing personal injury.

•Test the blade by balancing it on a round shaft screwdriver or a blade balancer. See Figure 17.

•If the blade is not balanced, remove metal from the heavy side until it balances evenly.

1.Insert screw driver through hole

2.Blade should be parallel to ground

Hex Bolt

Blade

Blade Bell Support

Screw						Blade
Screw
Driver
Driver


						Ground

Figure 17

Engine Adjustments

AD JU ST ME N

Figure 16

•Place the new blade with the side marked bottom (or with part number) facing away from the adapter.

•Place the bell support next. Make sure to align the tabs in the holes of the blade with the hole in the bell support.

•Insert the hex bolt through the blade assembly. Figure 16 shows the correct order of assembly.

•Use block of wood to hold blade again while you tighten the bolt clockwise. Follow the recommended torque for the bolt which is 450- 600 in.-lbs.

IMPORTANT: The bolt, used to secure the blade to the engine, is specially heat-treated. Do not substitute. To order replacement bolt, refer to the Repair Parts section of this manual.

WARNING: To ensure safe operation of

your unit, all nuts and bolts must be

checked periodically for correct tightness.

WARNING: Do not make unnecessary adjustments on the engine. Factory settings are satisfactory for most conditions.

If any adjustments are made to the engine while the engine is running, keep clear of all moving parts. Be careful of heated surfaces and muffler. Keep your hands away from these parts.

Carburetor

The carburetor has been pre-set at the factory and should not require adjustment.

•If the engine on your mower does not operate properly due to suspected carburetor problems, take your lawn mower to your nearest SEARS service center.

•Engine performance may be affected in altitudes above 4000 feet. To improve engine

performance, install a high altitude adjustment kit, available at the SEARS service center.

NOTE: A dirty air cleaner will cause an engine to run rough. Be certain air cleaner is clean and attached to the carburetor.