TM 5-3895-354-14&P
89. CIRCULATING PUMP CAPACITY IS LOW
Probable Cause
Possible Remedy
Circulating pump motor does not run at rated R.P.M.
Generator not producing correct voltage & cycles.
Check power supply. Replace a defective motor (Para
34)
Air leaks or cavitation
Tighten all loose or leaking pipe or hose connections in
the hot fluid transfer oil system (Para. 10 & 37).
Tighten all valve packing
Pump packing causing friction
Adjust packing nuts (Para. 33)
Circulating pump defective
Replace a defective pump (Para. 33)
90. CIRCULATING PUMP MOTOR NOISY
Probable Cause
Possible Remedy-
Circulating pump motor running single phase
Inspect for open circuit and make necessary
repairs (Para. 34 & 41).
Circulating pump motor out of alignment with the
Inspect alignment of the drive coupling. Align the motor
circulating pump
and pump (Para 33 & 34).
Defective circulating pump
Operate the motor without a load
Replace a defective pump or motor if necessary (Para
33 & 34)
Mounting bolts loose
Tighten mounting bolts
Bearings worn out
Replace bearings
91. CIRCULATING PUMP MOTOR RUNS HOT
Probable Cause
Possible Remedy
Circulating pump motor running single phase
Inspect for open circuit and make necessary
repairs (Para 34 & 41).
Improperly adjusted packing, defective pump
Adjust the packing nuts or replace defective
pump
Incorrect voltage and cycles
Inspect and check incoming external power
source (Para 10 & 41)
Restricted ventilation
Clean air passages (Para. 34)
Coupling out of alignment
Align the circulating pump motor and the circulating
pump (Para 33 & 34)
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