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Adjustments: Carburetor; Engine Speed; Throttle - Craftsman 247.795950 Owner's Manual

5 horsepower 3 cutting stage mulching and bagging
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• 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.
Nail
/ °
Blade
!
\
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.
THROTTLEADJUSTMENT
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.
Throttle
Control.
Lever
Wing
Nut
FIGURE 23.
CARBURETORADJUSTMENT
WARNING:
IF ANY ADJUSTMENTS
ARE
_IL
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 idle mixture valve (see figure 24) clockwise
( f'_ ) 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
(,,_)
and hold
against idle speed adjusting screw. Turn idle speed
adjusting
screw until engine
is running
at 1750
RPM.
• Turn idle mixture valve clockwise
(¢-_) (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.
Speed
Screw
Throttle
Idle
Mixture
Valve
FIGURE 24.
ENGINESPEED
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.
15

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