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F-17
TROUBLESHOOTING & REPAIR
F-17
POWER-ARC 4000
TEST PROCEDURE
This test can be conducted by any of
three methods.
Strobe-tach Method:
1. Stop the engine and remove the
spark plug wire to prevent acciden-
tal kickback or starting.
2. With the black or red marking pencil,
place a mark on one of the blower
paddles, which can be reached
through the vent slots in the end
bracket. See Figure F.4.
3. Connect the strobe-tach according
the manufacturer’s instructions.
4. Reconnect the spark plug wire and
start the engine. Direct the strobe-
tach light on the blower paddle and
synchronize it to the rotating mark.
The tach should read 3700 RPM.
5. Loosen Wing Nut (Refer to Figure
F.5)
6. Refering to Figure F.5, adjust high
speed stop screw until tach reads
3700 RPM.
7. Re-tighten wing nut until wave
washer is completely compressed.
Frequency Counter Method:
1. Plug the frequency counter into one
of the 115 VAC auxiliary recepta-
cles.
2. Start the engine and check the
frequency counter. At the proper
RPM (3700), the counter should
read 63 Hz.
3. Loosen Wing Nut (Refer to Figure
F.5)
4. Refering to Figure F.5, adjust high
speed stop screw until the frequency
counter reads 63Hz.
5. Re-tighten wing nut until wave
washer is completely compressed.
Oscilloscope Method:
1. Connect the oscilloscope according
to the manufacturer’s instructions.
At 3700 RPM, the waveform should
exhibit a period of 15.8 milliseconds.
Refer to the NORMAL OPEN
CIRCUIT VOLTAGE WAVEFORM
(115 VAC SUPPLY) HIGH IDLE - NO
LOAD in this section of the manual.
ENGINE THROTTLE ADJUSTMENT TEST (continued)
FIGURE F.4 - BLOWER PADDLE MARKED FOR STROBE-TACH METHOD
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