Blade Sharpening; Blade Installation - Craftsman 247.370480 Manual Del Operador

bLADE CARE
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. Be certain to stop motor and remove key.
Periodically inspect the blade adapter for cracks, especially if you
strike a foreign object. Replace when necessary. Follow the steps
below for blade service.
blade Removal
1. Stop the motor and remove ignition key. Turn the mower on its side.
2. Place a 2x4 block of wood approximately 8.5" long between the
deck housing and the cutting blade to act as a stabilizer. See Figure
11.
3. Loosen and remove the blade bolt, locking plate, and blade. See
Figure 11.

blade Sharpening

IMPORTANT: If any metal separation is present, replace the blades
with new ones.
1. To properly sharpen the cutting blades, remove equal amounts
of metal from both ends of the blades along the cutting edges,
parallel to the trailing edge, at a 25° to 30° angle. See Figure 12.
a. It is important that each cutting blade edge be ground
equally to maintain proper blade balance. A poorly balanced
blade will cause excessive vibration and may cause damage
to the mower and result in personal injury. The blade can be
tested by balancing it on a round shaft screwdriver. Grind
metal from the heavy side until it balances evenly.
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.

blade Installation

1. Place the cutting blade, locking plate, and blade bolt on the motor
shaft and thread the blade bolt in finger tight.
NOTE: Make certain to replace the parts in the exact order in which
they were removed. When installing the cutting blade, be sure it is
installed with the curved ends pointing towards the mower deck and
not towards the ground.
2. Torque the blade bolt down using a torque wrench to assure the
bolt is tightened properly. The recommended torque for the blade
bolt is 170-220 in. lbs.
SERVICE AND MAINTENANCE
Block of Locking
Wood Plate
To ensure safe operation of your mower, periodically check the blade
bolt for correct torque.
WARNING
The blade hardware is not only used to attach the blade assembly,
but is also an insulated safety device and should never be altered in
any way. If replacement is necessary, use original equipment parts as
shown in the parts list.
13
Blade
Blade
Bolt
Figure 11
Figure 12