Craftsman 247.797855 Owner's Manual page 15

NOTE: U secaution whenremoving thebladeto avoid
contacting t heweldboltsonthehousing.
® Whensharpeningthe blade, followthe original
angleof grindas a guide.It is extremely i mportant
thateachcutting edgereceives anequal a mount o f
grinding toprevent a nunbalanced b lade. A nunbal-
ancedbladewill causeexcessive vibration when
rotating at highspeeds andmaycausedamage to
theunit
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 21.
Nail /
......... ......
t ....................... oTo' o
FIGURE 21.
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.
CARBURETORADJUSTMENT
_ 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-
TORn 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 22) clockwise
((-_) finger tight only. Forcing may cause damage
Then open 1-1/2 turns counterclockwise (v'_).
® Start engine and allow to warm for five minutes.
e With throttle in FAST position, 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 mixture should be rich
enough for best performance under Ioado
e Place throttle control in IDLE position.
If engine idles, no further adjustment is necessary..
If engine idles too fast, turn idle speed adjusting
screw counterclockwise (v--_) 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 tDLE position_ If engine
does not idle, repeat third step.
e 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
Stop
FIGURE 22.
Throttle
Needle Valve
15
ENGINESPEED
Your engine speed has been factory seL 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