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TROUBLESHOOTING & REPAIR
F-37 F-37
RANGER 10-LX
ENGINE THROTTLE ADJUSTMENT TEST (continued)
Adjust HIGH IDLE: First make sure there is
NOT a load on the machine. Use the 10mm
wrench to loosen the lock nut. See Figure F.9
for location of adjustment screw and lock nut.
With the 10mm wrench turn the adjustment
screw counterclockwise to increase the high
idle RPM. Note: It is usually NOT necessary to
cut or remove the wire and seal. Adjust the
speed until the tach reads between 3650 and
3700 RPM.
Adjust LOW IDLE: First make sure there is
NOT a load on the machine. Set the IDLE
switch to AUTO and wait for the engine to
change to low idle speed. Use the 7/16”
wrench to loosen the lock nut. See Figure F.10
for location. Use the 1/2” wrench to adjust the
solenoid, which changes the amount of throw
in the throttle lever arm. Adjust the nut until the
tach reads between 2150 and 2220 RPM.
Frequency Counter Method
1. Plug the frequency counter into one of the
115 VAC 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 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: First make sure there is
NOT a load on the machine. Use the 10mm
wrench to loosen the lock nut. See Figure F.9.
for location of adjustment screw and lock nut.
With the10mm wrench, turn the adjustment
screw counterclockwise to increase the high
idle RPM. Note: It is usually NOT necessary to
cut or remove the wire and seal. Adjust the
speed until the frequency is 63 Hz.
Adjust LOW IDLE: First make sure there is NOT
a load on the machine. Set the IDLE switch to
AUTO and wait for the engine to change to low
idle speed. Use the 7/16” wrench to loosen the
lock nut. See Figure F.10. for location. Use
the 1/2” wrench to adjust the solenoid, which
changes the amount of throw in the throttle
lever arm. Adjust the nut until the frequency is
37 Hz.
FIGURE F.9 – HIGH IDLE ADJUSTMENT NUT
Lock Nut
Lock Nut
Adjustment Screw
Adjustment Screw