Sears 247.795860 - Manual (Page 15)

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 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.
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 should 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 needle valve (see figure 23) clockwise
() finger tight only. Forcing may cause damage.
Then open 1-1/2 turns counterclockwise ( ) .
• Start engine and allow to warm for five minutes.
• Close needle valve clockwise (^ ) until engine
starts to lose speed (lean mixture). Then slowly
open needle valve counterclockwise ( ^) until
engine JUST BEGINS to run unevenly. This mix­
ture should be rich enough for best performance
under load.
• Rotate throttle counterclockwise (»^ ) and hold
against throttle stop.
If engine idles, no further adjustment is necessary.
If engine idles too fast, turn idle speed adjusting
screw counterclockwise (*^ ) until slower speed is
obtained.
If engine dies, turn idle speed adjusting screw 1/4
turn clockwise (<^ ). Place throttle control in FAST
position and restart engine.
Move throttle control to IDLE position. If engine
does not idle, repeat third step.
• Test the engine by using the chipper-shredder. If
engine tends to stall or die out, it usually indicates
that the mixture is slightly lean and it may be nec­
essary to open ("^ ) the needle valve slightly to
provide a richer mixture. This richer mixture may
cause a slight unevenness in idling.
Idle Speed Adjusting Screw
Throttle
Idle Mixture
Needle Valve
(High Speed)
FIGURE 23.
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.
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