Section V. TROUBLESHOOTING
4-10. General
2. Each malfunction stated is followed by a list of
tests or inspections to locate or verify the
This section provides information useful in
m a l f u n c t i o n , followed by the corrective action
diagnosing and correcting unsatisfactory operation
recommended to remedy the malfunction.
or failure of the filter-separator and its components.
Malfunctions which may occur are listed in table 4-
Table 4-2. TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
YELLOW BUTTON ON DIFFERENTIAL PRESSURE INDICATOR POPS UP.
Inspect elements as they may be contaminated.
Replace elements:
2. RED BUTTON ON DIFFERENTIAL PRESSURE INDICATOR POPS UP.
Step 1. Check inlet and outlet for clogged condition.
Clean inlet and outlet pipes.
Step 2. Inspect differential pressure lines for leaking or frozen condition.
Repair or replace lines (para 4-15).
Step 3. Inspect differential pressure indicator for defective condition.
Test differential pressure indicator and replace (para 4-16).
Step 4.
Inspect filter elements for dirty, ruptured, or clogged condition.
Replace filter elements.
Section VI. MAINTENANCE OF VALVES, LINES, AND FITTINGS
4-11. General
(3) Unscrew water drain valve from tank.
b. Cleaning.
The valves, lines, and fittings include the two
(1) Remove all dust, dirt, and film from all
differential pressure indicator lines, the water drain
parts with a brush.
valve and drain line, the inlet coupler and outlet
(2) Clean all metal parts in cleaning solvent
adapter, and the air vent valve.
and dry thoroughly. Refer to TM 38-230.
c. Inspection of Water Drain Valve.
a. Removal. Remove the water drain valve (36,
(1) Examine all threaded areas for thread
damage.
(1) Stop pumping unit. Shut off up-stream
(2) Inspect water drain valve for mechanical
and down-stream system valves.
damage.
CAUTION
d. Installation of Water Drain Valve.
Depressurize the tank before at-
(1) Install water drain valve into tank. Apply
tempting removal of the water drain
sealing compound MIL-S-7916 to all threaded
valve.
fittings. Tighten securely.
(2) Slowly open the air vent valve (5, fig. 1-2,
(2) Start up operation of filter-separator as
sheet 1 of 2) to relieve pressure in filter-separator.
described in paragraph 2-2.
Open water drain valve (36, fig. 1-2, sheet 2 of 2)
and drain tank.
Section VIl. MAINTENANCE OF WATER-LEVEL SIGHT GAGE
AND DIFFERENTIAL PRESSURE INDICATOR
4-13. General
b. The differential pressure indicator is con-
trolled by pressure supplied through two lines. One
a. The water-level sight gage consists of a float
l i n e supplies pressure f r o m b e l o w t h e f i l t e r -
ball in a plastic body to indicate the level of water in
separator tank baffle. T h e other line supplies
the bottom of the filter-separator tank.
