Sears 770-7387F 247.78089 - Manual (Page 14)

Weld Bolt
• Hold the blade retainer on the impeller assembly
with an adjustable wrench to keep the blade from
turning as shown in figure 20.
• Remove the blade by removing the center bolt, lock
washer and flat washer.
NOTE: 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 un­
balanced 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.
FIGURE 21.
• When reassembling the blade, tighten to between
550 and 650 inch pounds, or if lacking torque
wrench, tighten securely.
FLAILS
The flails, located inside the housing, may be reversed
when they become dull. It is suggested that this pro­
cedure be performed by your nearest Sears Service
Department.
CARBURETOR ADJUSTMENT
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.
A
WARNING: IF ANY ADJUSTMENTS ARE
MADE TO THE ENGINE WHILE THE
ENGINE IS RUNNING (E.G. CAR­
BURETOR), KEEP CLEAR OF ALL
MOVING PARTS. BE CAREFUL OF
HEATED SURFACES AND MUFFLER.
ENGINE SPEED
Your engine speed has been factory set. Do not attempt
to increase engine speed or it may result in personal
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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