Craftsman 247.887760 - Manual (Page 20)

SERVICE AND MAINTENANCE
BLADE CARE
Periodically inspect the blade adapter tor cracks, especially if you
strike a foreign object. Replace when necessary. Follow the steps
below for blade service.
A warning
When removing the cutting blade for sharpening or replacement,
protect your hands with a pair of heavy gloves or use a heavy rag to
hold the blade.
1. Disconnect spark plug boot from spark plug. Turn mower on its
side making sure that the air filter and the carburetor are facing
up.
2. Remove the bolt and the blade bell support which hold the blade
and the blade adapter to the engine crankshaft. See Figure 18.
3. Remove blade and adapter from the crankshaft.
4. Remove blade from the adapter for testing balance. Balance the
blade on a round shaft screwdriver to check. Remove metal from
the heavy side until It balances evenly. When sharpening the
blade, follow the original angle of grind. Grind each cutting edge
equally to keep the blade balanced.
A warning
An unbalanced blade will cause excessive vibration when rotating at
high speeds. It may cause damage to mower and could break causing
personal injury.
1. Loosen star knobs securing upper and lower handles and
carefully fold the upper handle down toward the lower handle as
shown in Figure 19.
2. Remove the two screws securing battery cover to battery housing
and place them to the side. See Figure 19.
5. Lubricate the engine crankshaft and the inner surface of the blade
adapter with light oil. Slide the blade adapter onto the engine
crankshaft. Place the blade on the adapter such that the side of
the blade marked “Bottom” (or with part number) faces the ground
when the mower is in the operating position. Make sure that the
blade Is aligned and seated on the blade adapter flanges.
6. Place blade bell support on the blade. Align notches on the blade
bell support with small holes in blade.
7. Replace hex bolt and tighten hex bolt to torque: 450 in. lbs. min.,
600 in. lbs. max.
To ensure safe operation of your mower, periodically check the blade
bolt tor correct torque.
BELT CARE
NOTE: Several components must be removed in order to change the
mower's self-propulsion drive belt. See an authorized Sears Service
Center to have your belt replaced.
REPLACING BATTERY
A warning
Batteries contain sulfuric acid which may cause burns. Do not short
circuit or mutilate batteries in any way. Do not put batteries in fire as
these may burst or release toxic materials.
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