Craftsman 247.370320 Owner's Manual download pdf (Page 15)

BLADE CARE

Periodically inspect the blade adapter for cracks,

especially if you strike a foreign object. Replace when

necessary.

WARNING: When removing the cutting

blade for sharpening or replacement,

protect hands by using heavy gloves or a

rag to grasp the cutting blade.

Disconnect spark plug wire from spark plug.

Turn mower on its side making sure that the air

filter and the carburetor are up.

To Remove Blade

Remove the bolt and blade bell support which

hold the blade and adapter to the engine

crankshaft. See Figure 13.

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 13.

Blade Adapter

Crankshaft

Single-Bolt

Blade

recommended torque for the bolt which is 450-

600 in.-Ibs.

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.

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, thus causing

possible damage to the mower and/or personal injury.

• Test the blade by balancing it on a round shaft

screwdriver or a blade balancer, See Figure 14.

• 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

Screw

_ Drlve_ Blade__

Ground

Figure 14

Blade Bell

Hex Bolt

Support

Figure 13

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 13 shows the correct order of assembly.

Use block of wood to hold blade again while you

tighten the bolt clockwise. Follow the

ENGINE ADJUSTMENTS

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,

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Craftsman 247.370320 Owner's Manual Page 15

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