Table 4-2 UNIT TROUBLESHOOTING - Continued
TEST OR INSPECTION
PUMP WILL NOT ENGAGE - Continued
If solenoid operates, fault is due to.
Failed pump, replace pump, (see para. 4-18).
Failed reducer gearbox, replace gearbox, (see para. 4-17).
Failed PTO, replace PTO, (see para. 4-17).
Leaking oil pressure lines, replace oil lines, (see para. 4-17).
Failed transmission, refer to Direct Support.
PUMP ENGAGES BUT WILL NOT ACHIEVE DESIRED WATER PRESSURES
Check pressure relief valve is not blowing off.
Replace valve as required, (see para. 4-18).
Check air pressure to air regulator.
Secondary air pressure must be greater than 85 psi (590 kPa).
Check air pressure out of regulator.
Pump-and-roll regulator should be at least 75 psi (520 kPa), structural regulator should
have variable air pressure up to 100 psi (690 kPa).
Check pump speed
Binding in pump, replace pump, (see para. 4-18).
Binding in reducer gearbox, replace gearbox, (see para. 4-17).
PTO clutch worn out - replace PTO, (see para. 4-17).
PUMP WILL NOT PRIME.
Check fiber wheel clearance.
Refer to Direct Support if wheel worn.
Check hose connections between suction and priming pump for leaks.
Replace hoses/tighten connections as required.