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TM 55-2915-335-30&P
Table 2-2. Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
MOTOR RUNS, LOW FLOW AND/OR PRESSURE.
Running motor over one minute without a
flow of liquid may cause permanent
damage to the motor.
Step 1. Check for motor running backwards.
Connect pump to 28 vdc power supply. Start
pump and check that startup torque of motor
is counterclockwise, as shown. If startup torque
is clockwise, field tube is reversed on cartridge.
If motor rotation is correct, go to Step 2 if
checking assembled pump cartridge and hous-
ing assembly. If checking pump cartridge only
go to Step 4.
Remove field tube and install
correctly per instructions and il-
lustrations in paragraph 2-18.
Step 2. Determine if low flow and/or pressure is
due to malfunction in cartridge or housing as-
sembly. Remove cartridge from housing per
paragraph 2-10. Install cartridge in test tank
per paragraph 2-25 and repeat flow test, Table
2-1, block 8 and pressure test Table 2-1, block
11.
Step 3.
valve.
If cartridge passes test, bypass
valve in housing is defective. In-
spect housing valve seat and
ball per Step 3.
If cartridge fails test, isolate
problem in cartridge; go to
Step 4.
Check for faulty or jammed bypass
Inspect ball and valve seat per
the instructions and illustra-
tions in paragraph 2-13.
2-13
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