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TM 5-4210-220-12
Table 4-2 UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5a
PUMP WILL NOT ENGAGE - Continued
Step 4
If solenoid operates, fault is due to.
a
Failed pump, replace pump, (see para. 4-18).
b
Failed reducer gearbox, replace gearbox, (see para. 4-17).
c
Failed PTO, replace PTO, (see para. 4-17).
d
Leaking oil pressure lines, replace oil lines, (see para. 4-17).
e
Failed transmission, refer to Direct Support.
5b
PUMP ENGAGES BUT WILL NOT ACHIEVE DESIRED WATER PRESSURES
Step 1
Check pressure relief valve is not blowing off.
Replace valve as required, (see para. 4-18).
Step 2
Check air pressure to air regulator.
Secondary air pressure must be greater than 85 psi (590 kPa).
Step 3
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).
Step 4
Check pump speed
a
Binding in pump, replace pump, (see para. 4-18).
b
Binding in reducer gearbox, replace gearbox, (see para. 4-17).
c
PTO clutch worn out - replace PTO, (see para. 4-17).
5c
PUMP WILL NOT PRIME.
Step 1
Check fiber wheel clearance.
Refer to Direct Support if wheel worn.
Step 2
Check hose connections between suction and priming pump for leaks.
Replace hoses/tighten connections as required.
4-29
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