Table 2-2. Troubleshooting - TM-55-1905-223-24-160033

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SECTION IV. UNIT MAINTENANCE TROUBLESHOOTING

TM-55-1905-223-24-16 Stern Anchor Winch for Landing Craft Utility (LCU) NSN 1905-01-154-1191 Manual

Table 2-2. Troubleshooting

TM 55-1905-223-24-16

a. Operating Limitations. The stern anchor winch subsystem is designed to operate within temperature and pressure

limitations. Maximum safe hydraulic fluid operating temperature is 1500F. Maximum safe hydraulic fluid operating

pressure is 2,900 psi. In addition, hydraulic fluid in the reservoir tank and lubricating oil in the gear box must be kept at the

full level.

b. Problem Indicators. Operating temperatures above 150OF; low, erratic, or no hydraulic pressure, and low levels

of hydraulic fluid or lubrication oil are usually signs of minor problems. Other indicators are leaks and unusual heat

produced by hydraulic system components. Maintenance that corrects these problems prevents damage to subsystem

components that result in major difficulties. Unusual noises produced by the alternating current motor, drive coupling,

hydraulic pump, hydraulic pump assembly, hydraulic valve assembly, gear box, and winch are usually indications of major

problems.

Table 2-2. Troubleshooting

Malfunction

Test or Inspection

Corrective Action

1. No pressure in hydraulic system.

STEP 1. Ensure power pack assembly is on line.

STEP 2. Check for low hydraulic level in reservoir tank.

a. Add hydraulic fluid (para. 2-6).

b. Secure all hydraulic fittings.

STEP 3. Check for correct relief valve setting (2900 psi).

Adjust relief valve (para. 2-13).

STEP 4. Check to see if solenoid operated directional control valve is stuck in the open position.

Repair or replace defective valve (para. 2-18).

STEP 5. Check for air leak in suction line.

Secure all fittings and connections.

STEP 6. Check to see if hydraulic fluid viscosity is too heavy to pick up prime (especially in cold weather).

Use lighter viscosity hydraulic fluid.

STEP 7. Check for wrong direction of hydraulic pump rotation.

Reverse rotation of alternating current motor (para.

STEP 8. Check for broken shaft or broken parts inside hydraulic pump.

Replace hydraulic pump (para. 2-17).

2. Low pressure in hydraulic system.

STEP 1. Check for external leakage.

Repair or replace hydraulic valve (para.

2-17