Lincoln Electric RANGER 225 GXT Service Manual page 71

F-31
ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.7
HIGH IDLE ADJUSTMENT NUT
3 / 8 " H i g h I d l e l i n k a g e C h o k e A d j u s t m e n t N u t C a b l e
T h r o t t l e
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 adjustment 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.8
for location of the adjustment nut. Adjust the
nut until the tach reads between 2300 and
2500 RPM.
Frequency Counter Method
1. Plug the frequency counter into one of the 115
VAC auxiliary receptacles.
TROUBLESHOOTING AND REPAIR
3/8" High Idle
Adjustment Nut
RANGER® 225 GXT
FIGURE F.8
LOW IDLE ADJUSTMENT NUT
R o d
N u t A d j u s t m e n t 3 / 8 " L o w I d l e H o u s i n g S o l e n o i d
3/8" Low Idle
Adjustment
Solenoid
Nut
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), the counter should read
38.3 to 41.6 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.7 for location of the adjustment nut. Turn the
nut clockwise to increase 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.8
for location of the adjustment nut. Adjust the
nut until the frequency reads between 38.3 and
41.6 Hz.
F-31
Rod