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TM 10-4320-351-14
TABLE 3-1. TROUBLESHOOTING (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Inspect filter element for clogging.
Tap lightly against hand to remove clogging.
7. Engine exhaust produces blue smoke.
Stop engine and wait 2-3 minutes for oil to drain down. Check level on dipstick.
If level is above maximum mark, notify unit maintenance.
8. Fuel transfer pump will not prime.
Ensure that all valves on inlet side are open.
Notify unit maintenance.
9. Fuel transfer pump does not provide flow and pressure when engine is running.
Step 1. Verify that all system valves are open.
Step 2. Ensure no kinks in hoses.
Notify unit maintenance.
Section III. OPERATOR MAINTENANCE PROCEDURES
3.3 REPLACE UNISEX COUPLING FACE SEAL/DUST CAP SEAL.
This procedure applies to all pumping assembly unisex couplings. The seal in each coupling face and the dust cap are
identical, and may be interchanged as a temporary repair.
The face plate and dust cap of pumping assembly unisex couplings employ a U-ring type seal which is designed to seat
with pressure. The seal is slightly higher than the groove it sits in, so that the top protrudes above the surface.
Pressurized fluid enters beneath this protrusion and expands the seal against the bottom of the seal groove and against
the corresponding seal in the dust cap or other face place. Special care must be taken during installation to ensure the
seal is fully seated in the groove. If it is not, pressurized fluid will be forced under the seal and the coupling will leak.
3.3.1 Replace Face Seal. (Refer to figure 3-1.)
a. Removal.
Remove face seal (1) by hand.
3-3
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