Lincoln Electric RANGER 8 SVM107-B Service Manual page 71

F-31
ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.8
HIGH IDLE ADJUSTMENT NUT
Throttle
linkage
Choke
Cable
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.
speed until the tach reads between 3650
and 3750 RPM.
Adjust LOW IDLE: First make sure there is
no load on the machine.
switch to AUTO and wait for the engine to
change to low idle speed.
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.
TROUBLESHOOTING & REPAIR
3/8" High Idle
Adjustment Nut
Adjust the
Set the IDLE
Use the 3/8"
RANGER 8
FIGURE F.9
LOW IDLE ADJUSTMENT NUT
Solenoid 3/8" Low Idle
Adjustment
Housing
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),
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.
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.
F-31
Muffler
Nut
Rod
the counter
Adjust the