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TM 55-1905-223-24-4
DISASSEMBLY
a. Remove fou r machine screws (14), slowly pulling the diesel engine governor (13) from housing.
b. Tag and disconnect internal wiring. Remove diesel engine governor (13).
c.
Remove magnetic speed sensor (11) by unscrewing counterclockwise.
d. Inspect governor and speed sensor for cracks, rust or corrosion.
TEST
a. Speed Sensor Test. (FIGURE 3-6)
(1)
To determine if the signal from the speed sensor is being received at the controller, follow the procedure
outlined below:
(a) Connect DC voltmeter between P5 connector, pin 5 on circuit board, and ground-voltmeter should read
battery voltage on 12 volt systems, or 16 volts on 24 volt system.
(b) With generator set running, connect DC voltmeter between P5 connector, pin 8 on the circuit board,
and ground-voltage reading should equal voltage read in step (a) minues approximately 2 volts.
(2)
If the speed sensor signal is not being received at the generator set controller, test speed sensor:
(a) Connect speed sensor, voltmeter and DC voltage sour e as shown.
c
1.
DC Voltmeter
2.
12 Volt DC Power Supply
3.
Sensing Surface
FIGURE 3-6. Speed Sensor Test Hookup.
3-19

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