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

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

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

Loss of fluid from reservoir

TM 55-1905-220-14-3

Table 3-12.

Hydrostarter - Cranking Speed Too Low Troubleshooting.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Cranking speed to low.

Step 1.

Check that hydrostarter system fluid is not too heavy.

Check the fluid in the system. Use Hydraulic Fluid MIL-L-17672 type 2135 TH.

Step 2.

Check that engine oil is not too heavy.

Replace the oil with the proper viscosity grade.

LUBRICATING OIL GRADES

DESCRIPTION

SPECIFICATION

OES (Sub Zero)

MIL-L-10295

OE/HDO - 10

MIL-L-2104

OE/HDO - 20

MIL-L-2104

OE/HDO - 30

MIL-L-2104

Step 3.

Check for control valve that is not fully open.

Valve body sticking in valve housing.

Replace valve cage and valve

assembly.

Step 4.

Check for inlet line restricted.

Check plumbing from accumulator to hydrostarter to insure hoses are not

collapsed and are free of obstructions.

Step 5.

Check for excessive internal leakage in hydrostarter.

Examine around hydrostarter for broken thrust bearing plate, scored port plate,

frozen piston or broken cylinder spring.

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