Sears 358.356090-3.7/20" - Manual (Page 22)

3. Remove the fan housing.
4. Use a 9/16” socket wrench on the flywheel
nut to keep the crankshaft from moving.
Figure 54.
NOTE: Place the socket handle forward as
shown in Figure 54.
5. Remove the clutch with a 3/4” socket or end
wrench in a
clockwise
direction. Figure 55.
KEIP
CRANKSHAFT
FROM MOVING
ICAUTIOi^Do not remove the clutch with a
punch or a power tool to avoid clutch damage
or breakage.
6. Remove worn sprocket and replace.
7. install clutch in a counferc/oc/cw/se direction.
Figure 55.
8. Hold flywheel by hand and torque clutch to
22 ft. pounds.
NOTE: Do not hold a wrench on the flywheel
nut when replacing the clutch. This could
loosen the flywheel nut.
9. Reinstall fan housing, bar chain and bar
clamp.
REMOVE CLUTCH
CLOCKWISE
INSTALL CLUTCH
COUNTERCLOCKWISE
Figure 54 Figure 55
E. CARBURETOR AD4USTMENTS
• The carburetor has been adjusted at the fac­
tory for sea level conditions. Adjustment may
become necessary if the unit is used at
significantly higher altitudes or if you notice
any of the following conditions:
—Chain moves with the engine at idle speed.
— Loss of cutting power which is not cor­
rected by air filter or muffler screen clean­
.......... ing.
—Engine dies or hesitates when it should
accelerate.
* Permanent damage will occur to the engine if
incorrect carburetor adjustments are made. To
make the adjustment, follow the procedure below
very carefully.
f. Turn the Low Speed Mixture Screw and the
High speed Mixture Screw one full turn
counterciockwise
LOW
SPEED
ADJ.
SCREW
IDLE Vii
SPEED ADJ. SCREW
WARNING!
The chain may be moving during this procedure.
Wear your protective gear and observe ail of the
safety precautions.
1. PREPARATION
a. Stop engine.
b. Use a fresh fuel mixture with proper
gasoiine/oii ratio.
c. Place the saw on a solid, flat surface and
make sure the chain will not contact any
object.
d. Locate the three (3) Carburetor adjusting
screws located on the fan housing side of
the saw. Figure 56.
e. Turn the Low Speed Mixture Screw and the
High Speed Mixture Screw clockwise*^
just until they stop.
Do not turn the screws
until they are tight as you may damage
22 the needle seats.
Figure 56
2. IDLE SPEED ADJUSTMENT—I
a. Start the engine and allow to idle.
b. Adjust if the engine dies or stops by turning
the Idle Speed Screw 1/2 turn clockwise
NOTE; To increase idle speed, turn the Idle
Speed Screw clockwise . To
decrease idle speed, turn the Idle Speed
Screw counterclockwise .
c. Run the engine for a few minutes to bring it
up to operating temperature.
NOTE: The engine must be at operating
temperature for proper adjustments to be
made.
3. LOW SPEED MIXTURE ADJUSTMENT
a. Turn the Low Speed Mixture Screw slowly
clockwise until the RPM starts to
drop. Note the position.
b. Turn the Low Speed Mixture Screw coun­
terclockwise until the RPM speeds
up and starts to drop again. Note the posi­
tion.
c. Set the Low Speed Mixture Screw at the
mid-point between the two positions.