Craftsman 247.795950 - Manual (Page 15)

• 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 unbal­
anced 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 22.
• When reassembling the blade, tighten to between
550 and 650 inch pounds, or lacking torque
wrench, tighten securely.
FLAILS
The flails, located inside the housing, may be
reversed when they become dull. It is suggested that
this procedure be performed by your nearest Sears
Service Department.
THROHLE ADJUSTMENT
To adjust throttle control lever, loosen or tighten wing
nut until throttle control lever moves with some resis­
tance and still remains in desired position when
engine is running. See figure 23.
FIGURE 23.
CARBURETOR ADJUSTMENT
A
WARNING: IF ANY ADJUSTMENTS ARE
MADE TO THE ENGINE WHILE THE
ENGINE IS RUNNING (E.G. CARBURE­
TOR), KEEP CLEAR OF ALL MOVING
PARTS. BE CAREFUL OF HEATED SUR­
FACES AND MUFFLER.
Minor carburetor adjustment may be required to com­
pensate for differences in fuel, temperature, altitude
or load.
NOTE: A DIRTY AIR CLEANER WILL CAUSE
ENGINE TO RUN ROUGH. BE CERTAIN AIR
CLEANER IS CLEAN AND ATTACHED TO THE
CARBURETOR BEFORE ADJUSTING CARBURE­
TOR. DO NOT MAKE UNNECESSARY ADJUST­
MENTS. FACTORY SETTINGS ARE SATISFACTO­
RY FOR MOST APPLICATIONS AND CONDITIONS.
Never attempt to change maximum engine speed. It is
pre-set at the factory and shouid be changed only by
a qualified service technician who has the necessary
equipment.
The carburetor may need re-adjusting if engine lacks
power or does not idle properly. If adjustments are
needed, proceed as follows.
• Close idle mixture valve (see figure 24) clockwise
() finger tight only. Forcing may cause damage.
Then open 1-1/2 turns counterclockwise ( ) .
• Start engine and allow to warm for five minutes.
• Move throttle control lever to IDLE position.
• Rotate throttle counterclockwise
{ t r ^ ) and hold
against idle speed adjusting screw. Turn idle speed
adjusting screw until engine is running at 1750
RPM.
• Turn idle mixture valve clockwise (r>) (lean mix­
ture) until engine JUST starts to slow. Then turn it
counterclockwise () (rich mixture) until engine
starts to run unevenly. Set at midpoint between rich
and lean mixture.
• Recheck idle RPM and readjust if necessary.
•
Move throttle control lever to FAST position.
Engine should accelerate without hesitation or
sputtering. If It does not, carburetor should be read­
justed, usually to a slightly richer mixture.
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 adjust­
ment.
TIRES
Recommended operating tire pressure is 24 p.s.i.
(sidewall of tire may give tire manufacturer’s recom­
mended pressure). Equal tires pressure should be
maintained on both rires. When installing a tire to the
rim, be certain rim is clean and free of rust. Lubricate
both the tire and rim generously.
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