Engine driven pump fails to raise pressure (Cont) Step 3. Check for plugged screen or filter

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Engine driven pump fails to raise pressure (Cont)

TM-55-1905-220-14-3 Landing Craft Unit LCU 1671-1679 (1905-01-009-1056) Manual

Table 3-12. Hydrostarter - Cranking Speed Too Low Troubleshooting.

TM 55-1905-220-14-3

Table 3-11.

Hydrostarter - Low or No Accumulator Pressure Troubleshooting (Cont).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Engine driven pump fails to raise pressure (Cont) Step 3. Check for plugged screen or filter.

Remove and clean the reservoir screen and flush out the reservoir tank. Refer to

paragraph 3-52.

Clean the filter located in the supply hose between the reservoir and the engine-

driven pump. Refer to paragraph 3-52.

Step 4. Check for check valves not functioning properly.

Open the relief valve (3) on the side of the hand pump, while the engine is running

to permit the engine-driven pump to wash the check valves free from particles.

If the accumulator can be charged with the hand pump but not with the engine-

driven pump, then a check valve in the engine pump is defective. Replace the

faulty check valve assembly. Refer to paragraph 3-48.

Step 5. Check for defective drive.

Replace the pump drive arm. Refer to paragraph 3-48.

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