TM 5-4330-263-13&P
OPERATOR AND FIELD MAINTENANCE
FILTER/SEPARATOR, LIQUID FUEL, 50-, 100-, AND 350-GPM
TROUBLESHOOTING
INTRODUCTION
Table 1 lists common malfunctions that you may find with your equipment. Perform the tests, inspections, and corrective
actions in the order they appear in the table. This table cannot list all the malfunctions that can occur, all tests and inspec-
tions needed to find the fault, or all the corrective actions needed to correct the fault. If the equipment malfunction is not
listed or actions listed do not correct the fault, notify your supervisor.
Table 1. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Differential pressure gauge indication is 1.
Check pump operating speed and
1.
Adjust pump speed as necessary
in the RED area of the gauge.
verify that it is within specified
limits
2.
Coalescer element contaminated
2.
Immediately cease operation and
replace all canisters and coalescer
elements
1.
Verify that camlocks are securely
1.
Secure camlocks properly
Fuel leaking from input or output
coupling
fastened
2.
Stop operation and inspect
2.
Properly seat gaskets or replace
couplings to verify that gaskets are
defective gaskets
in place, properly seated, and free
from damage
Fuel leaking from vessel cover
1.
Check retaining band (50- and 100- 1.
Ensure retaining band locks
GPM) nuts for proper tightness.
properly, with nut torqued to 14 ft-
lbs. (50- and 100-GPM).
2.
Check lid nuts (350-GPM) for
2.
Ensure lid bolts are torqued to 150
proper tightness
ft-lbs. (350-GPM).
3.
Inspect head assembly o-ring for
3.
Remove head assembly and replace
wear or damage
o-ring
1.
Check for ruptured coalescer
1.
Replace all coalescer elements
Sudden drop in differential pressure
gauge indication
elements
1.
Check pump flow rate and
1.
Perform maintenance on pump
Filter/Separator output flow is
inadequate
performance
2.
Inspect discharge line for kinks or
2.
Remove obstructions and
obstructions
straighten line as necessary
3.
Check differential pressure gauge
3.
If reading is above limit, cease
and verify that reading is within
operations and replace all coalescer
limits (below red/15)
elements.
END OF WORK PACKAGE
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