HYDRAULIC GENERATOR OUTPUT FREQUENCY IS NOT CORRECT

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TM-9-2320-279-10-3 M977 Series 8x8 Heavy Expanded Mobility Tactical Trucks (HEMTT) Manual

CHECK PUMP ENGINE INDICATOR LIGHT COMES ON.

TM 9-2320-279-10-3

Troubleshooting Index (Cont)

3-16. TROUBLESHOOTING MALFUNCTIONS (CONT).

Table 3-5.

Troubleshooting

Malfunction

Test or Inspection

Corrective Action

11. HYDRAULIC GENERATOR OUTPUT FREQUENCY IS NOT

CORRECT.

406

HIGH IDLE

SWITCH

NOTE

Hydraulic Generator display should display a frequency reading

of 58 to 62 HR during normal operations.

Step 1. Check if HIGH IDLE switch in cab is in the ON position.

If HIGH IDLE switch is in the OFF position, place

HIGH IDLE switch to ON position.

Step 2. If problem still exists, notify Supervisor.

12. HYDRAULIC GENERATOR, NO OUTPUT VOLTAGE.

Step 1. Check if generator is operating.

If generator is not operating, start generator.

CIRCUIT BREAKER

1 AND 3

tfft00407

NOTE

Circuit breaker may be in ON position when tripped. To make

sure circuit breaker is not tripped, reset circuit breaker by

switching it to the OFF position then back to ON position.

Step 2. Check if circuit breakers 1 and 3 are tripped.

If circuit breakers 1 and 3 are tripped, reset circuit

breakers. If circuit breakers trip again, notify

Supervisor.

Step 3. If problem still exists, notify Supervisor.