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TM 5-4320-305-24
Table 2-2. Organizational Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Check for clogged strainer.
Remove and clean strainer (para 2-18).
Step 4. Inspect suction assembly strainer body and flanges for cracks or leaks.
Repair or replace damaged suction assembly components (para 2-18).
Step 5. Inspect discharge check valve assembly for proper operation. Check that extension spring and
attaching hardware are tight and free of corrosion. Inspect check valve assembly for evidence of
leakage and seal damage. When in closed position, check valve disc must make an airtight seal. Be
sure valve gasket disc is free to open with pump flow.
Repair or replace damaged discharge check valve (para 2-19 and 2-21).
Step 6. Check pump body for foreign material.
a. Remove suction assembly (para 2-18) and discharge manifold assembly (para 2-19).
b. Inspect pump body for any foreign material or obstruction.
10. PUMP OUTPUT LOW
Step 1. Be sure engine is primed.
Step 2. Check that engine speed is properly adjusted for desired flow and conditions.
Adjust engine speed.
Step 3. In order, perform steps 1 through 6 of Malfunction 8.
11. TRAILER-MOUNTED PUMP UNIT IS HARD TO TOW
Step 1. Check for under-inflated tires.
a. Inflate tires if pressure is low.
b. If one or both tires are flat, carefully jack up trailer, then replace tire or tires (para 2-48).
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