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ENGINE THROTTLE ADJUSTMENT TEST (continued)
Oscilloscope Method:
1. Connect the oscilloscope to the 115 VAC
receptacle, according to the manufacturer’s
instructions. At 3700 RPM, the waveform
should exhibit a period of 16.2 milliseconds.
At 2200 RPM, the waveform should exhibit a
period of 27.3 milliseconds. Refer to NOR-
MAL OPEN CIRCUIT VOLTAGE WAVE-
FORM (115 VAC SUPPLY) HIGH IDLE – NO
LOAD in this section of the manual.
2. If either waveform periods 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. Adjust
the speed until the period is 16.2 milliseconds.
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
speed until the period is 27.3 milliseconds.
Vibratach Method:
1. Place the vibratach as close to the engine as
possible. With the machine case top
removed, the top of the air cleaner is the best
location.
2. Start the engine and observe the whip handle
of the vibratach. At HIGH IDLE (3700 RPM),
the whip handle should exhibit maximum
oscillation. At LOW IDLE (2200 RPM), the
whip handle should exhibit minimum oscilla-
tion. Note that these are median measure-
ments; vibratach readings may vary slightly
above or below:
3. If either of the vibratach indications is incor-
rect, 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 vibratach whip han-
dle exhibits maximum oscillation at 3650 to
3750 RPM.
Adjust LOW IDLE: First make sure that 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
speed until the vibratach whip handle exhibits
minimum oscillation at 2150 to 2250 RPM.
TROUBLESHOOTING AND REPAIR
F-30 F-30
EAGLE™ 10,000
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