Table 2-2. Troubleshooting - CONT - TM-55-1905-223-24-40050

TM 55-1905-223-24-4

Table 2-2. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

(10)

Start the generator set.

(11)

Carefully rotate the voltage adjustment to obtain the desired line voltage output (clockwise to increase).

(12)

Observe the regulator board LED.

(13)

If the LED flickers, adjust the dampening and stability potentiometers to approximately mid-positions.

(14)

Alternately adjust each potentiometer until the LED glows steadily.

(15)

Turn off the generator set.

(16)

Disconnect the voltmeter and reseal the voltage, dampening, and stability potentiometers with RTV

sealant.

15. Generator set output frequency high or low.

Check for fuel control lever not going to full speed position.

Correct lever travel. Refer to Malfunction 9, Item 2.

16. Generator set output fluctuating (frequency or voltage).

STEP 1.

Check for unstable load on set.

Open the generator set circuit breaker to see if engine speed is stable.

STEP 2.

Check for unstable engine speed.

Refer to "Generator set will not pull the load (low engine power),

Malfunction 9.

17. Engine will not shut down.

Check to see if engine is running on fumes drawn into the air intake.

Check the air intake ducts for the source of the fumes.

18. Fault lights illuminated; overtemperature shut down.

STEP 1.

Check coolant level.

Replenish coolant.

STEP 2.

Check to see if not enough air flows across radiator.

Check fan and belt. Look for obstructions that would prevent air flow across radiator.

STEP 3.

Check for a malfunctioning temperature sensor.

Check for continuity across the temperature sensor. Should have continuity only when coolant

temperature is above 107 .

2-33