Lincoln Electric RANGER 3PHASE SVM207-A Service Manual page 64

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ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.6 – BLOWER PADDLE MARKED FOR STROBE-TACH METHOD
Blower Paddle
TEST PROCEDURE
This test can be conducted by any one of four meth-
ods.
Strobe-tach Method:
1. With the 5/16" nut driver, remove the 6 sheet metal
screws from the case top.
2. Remove the rubber gasket (cover seal) from the lift
bail.
3. Remove the fuel cap. The rubber gasket for the fill
tube will come off with the case top.
4. Remove the case top, then replace the fuel cap.
5. Conduct this marking procedure with the gasoline
engine OFF.
6. Remove the spark plug wires to prevent accidental
engine kickback or starting.
7. With the black or red marking pencil, place a mark
on one of the blower paddles. See Figure F.6 for
location.
8. Connect the strobe-tach according the manufactur-
er's instructions.
TROUBLESHOOTING AND REPAIR
RANGER® 3 PHASE
9. Reconnect the spark plug wires and start the
engine. Direct the strobe-tach light on the blower
paddle and synchronize it to the rotating mark.
10. With the machine at HIGH IDLE the tach should
read between 3700 and 3750 RPM.
With the machine at LOW IDLE the tach should
read between 2150 and 2400 RPM.
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 clock-
wise to increase HIGH IDLE speed.
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.8 for location of the adjust-
ment nut. Adjust the nut until the tach reads
between 2150 and 2400 RPM.
F-26
Adjust the