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TROUBLESHOOTING & REPAIR
F-35 F-35
RANGER 9 RANGER 9
ENGINE THROTTLE ADJUSTMENT TEST (continued)
Throttle Linkage
Choke Cable
3/8" High Idle
Adjustment Nut
Housing
Solenoid
3/8" Low Idle
Adjustment Nut
Muffler
Rod
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 3700
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.
Frequency 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 63 Hz. At LOW IDLE
(2200 RPM), the counter should read 37
Hz. Note that these are median measure-
ments; 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 63 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 37 Hz.
FIGURE F.8
HIGH IDLE ADJUSTMENT NUT
FIGURE F.9
LOW IDLE ADJUSTMENT NUT