Craftsman 247.775870 - Manual (Page 15)

Shredding Blade
The shredding blade may be removed for sharpening
or replacement as follows.
•
Disconnect spark plug wire and move it away
from spark plug.
• Lower the hopper assembly. Block up the
housing. See figure 20.
Weld Bolt
• Remove the six hex lock nuts and lock washers
from the housing weld bolts using a 1/2" wrench.
Separate the chipper-shredder into two halves.
• Remove the back-up plate.
NOTE: When reassembling, make certain the
embossed tab faces inward towards the impeller, and
opening on the back-up plate is toward the bottom of
the unit.
• Remove the two hand knobs and cupped
washers which secure the discharge chute.
Raise the discharge chute.
• Insert a 112" or 3/4" diameter pipe through the
flail screen into the impeller to keep it from
turning, or remove the flail screen and insert a
piece of wood (2 x 4) into the chute opening.
• Remove the two outside screws on the blade,
using a 3/16" alien wrench and a 1/2" wrench.
• Remove the blade by removing the center bolt,
lock washer and flat washer.
A
WARNING: Use caution when removing
the blade to avoid contacting the weld bolts
on the housing.
When sharpening the blade, follow the original
angle of grind as a guide. It is extremely
important that each cutting edge receives an
equal amount of grinding to prevent an
unbalanced blade.
An unbalanced blade will cause excessive
vibration when rotating at high speeds and may
cause damage to the unit. The blade can be tested
for balance by balancing it on a round shaft
screwdriver or nail. Remove metal from the heavy
side until it is balanced evenly. See figure 21.
When reassembling the blade, tighten center
bolt to between 550 and 650 inch-pounds and
the two outer bolts to between 250 and 350 inch-
pounds, or lacking torque wrench, tighten
securely.
1. Insert screw driver through hole
2. Blade should be parallel to ground
Slîik____
BU«.»
O 0 o
Ground
Figure 21
ADJUSTING CARBURETOR
A
WARNING: If any adjustments are made to
the engine while the engine is running (e.g.
carburetor), keep clear of all moving parts.
Be careful of heated surfaces and muffler.
The carburetor has been pre-set at the factory and
should not require adjustment. However, if your
engine does not operate properly due to suspected
carburetor problems, take your chipper-shredder to
your nearest SEARS service center.
ENGINE SPEED
The engine speed on your chipper-shredder has been
set at the factory. Do not attempt to increase engine
speed or it may result in persona! injury. If you believe
the engine is running too fast or too slow, take your
chipper-shredder to the nearest SEARS service
center for repair and adjustment.
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