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TROUBLESHOOTING & REPAIR
F-31 F-31
RANGER 8
ENGINE THROTTLE ADJUSTMENT TEST (continued)
Throttle
linkage
Choke
Cable
3/8" High Idle
Adjustment Nut
Solenoid
Housing
3/8" Low Idle
Adjustment
Nut
Rod
Muffler
11. If either of the readings is incorrect, adjust
the throttle as follows:
Adjust HIGH IDLE: Use the 3/8” wrench to
turn the spring-loaded adjustment nut.
See Figure F.8 for location of the adjust-
ment nut. Turn the nut clockwise to
increase HIGH IDLE speed. Adjust the
speed until the tach reads between 3650
and 3750 RPM.
Adjust LOW IDLE: First make sure there is
no load on the machine. Set the IDLE
switch to AUTO and wait for the engine to
change to low idle speed. Use the 3/8”
wrench to adjust the solenoid nut, which
changes the amount of throw in the throttle
lever arm. See Figure F.9 for location of the
adjustment nut. Adjust the nut until the
tach reads between 2150 and 2250 RPM.
Fr
equency Counter Method
1. Plug the frequency counter into one of the
115 VAC auxiliary receptacles.
2. Start the engine and check the frequency
counter. At HIGH IDLE (3700 RPM), the
counter should read 60.8 to 62.5 Hz. At
LOW IDLE (2200 RPM), the counter
should read 35.8 to 37.5 Hz. Note that
these are median measurements; hertz
readings may vary slightly above or below.
3. If either of the readings is incorrect, adjust
the throttle as follows:
Adjust HIGH IDLE: Use the 3/8” wrench to
turn the spring-loaded adjustment nut.
See Figure F.8 for location of the adjust-
ment nut. Turn the nut clockwise to in-
crease HIGH IDLE speed. Adjust the
speed until the frequency reads between
60.8 and 62.5 Hz.
Adjust LOW IDLE: First make sure there is
no load on the machine. Set the IDLER
switch to AUTO and wait for the engine to
change to low idle speed. Use the 3/8”
wrench to adjust the solenoid nut, which
changes the amount of throw in the throttle
lever arm. See Figure F.9 for location of the
adjustment nut. Adjust the nut until the fre-
quency reads between 35.8 and 375.Hz.
FIGURE F.8
HIGH IDLE ADJUSTMENT NUT
FIGURE F.9
LOW IDLE ADJUSTMENT NUT