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NGTE: U secaution whenremoving
the blade to avoid
contacting the weld bolts on the housing_
e 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
e 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_
Nail_\
_
/
\
FIGURE 22.
e 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 A DJUSTMENT
WARNING:
IF ANY ADJUSTMENTS
ARE
MADE
TO THE ENGINE
WHILE
THE
ENGINE
IS RUNNING
(E.G. CARBURE-
TOR)p 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
e 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
e 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
O
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.
O
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 Adjust _g Screw
Throttle
Idle Mixture
FIGURE 23.
Needle Valve
(High Speed)
15
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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