PUMP ENGINE GOVERNOR CONTROL DOES NOT OPERATE.

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PUMP ENGINE FAILS TO CRANK WHEN PUMP ENGINE SWITCH IS PLACED IN THE START POSITION.

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

PUMP ENGINE RUNS ROUGH OR SHUTS DOWN WHILE RUNNING

TM 9-2320-279-10-3

Troubleshooting Index (Cont)

3-16. TROUBLESHOOTING MALFUNCTIONS (CONT).

Table 3-5.

Troubleshooting

Malfunction

Test or Inspection

Corrective Action

16. PUMP ENGINE GOVERNOR CONTROL DOES NOT OPERATE.

417

PUMP ENGINE

GOVERNOR CONTROL

Step 1. If operating governor control from the cab: Check if pump

operators panel governor control is active.

If pump operators panel governor control is active, select

MODE switch to deactivate governor control. Then

select cab governor control MODE switch to activate cab

governor control.

Step 2. If operating governor control from pump operators panel:

Check if cab governor control is active.

If cab governor control is active, select MODE switch to

deactivate governor control. Then select pump operators

panel governor control MODE switch to activate pump

operators panel governor control.

Step 3. Check if INTAKE or OPERATOR is displayed on active

governor control.

If INTAKE or OPERATOR is displayed on active

governor control, pump output pressure dropped and the

governor control was not able to maintain pressure

within 4 seconds. Correct problem and select DEC, INC,

or PRESET switch to activate governor control and set

pressure.

Step 4. Check if LO SUPPLY is displayed on active governor control.

If LO SUPPLY is displayed on active governor control,

pump output pressure dropped below 30 psi (207 kPa)

for more than 5 seconds: Correct problem and select

MODE switch to activate governor control.

Step 5. If problem still exists, notify Supervisor.