Table 4-2. Unit Troubleshooting - Continued

TM 5-4930-233-14

TM 4930-14/1

Table 4-2. Unit Troubleshooting - Continued

ITEM

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 3. Check for leaks in air compressor tubes, hoses and fittings.

Repair leaks as needed.

Step 4. Check for leaking pressure relief valve.

Replace pressure relief valve (para 4-28).

ONE LUBRICANT DISPENSER SYSTEM FAILS TO DISPENSE AT REQUIRED RATE.

Step 1. Check for faulty air pressure regulator.

Replace air regulator assembly (para 4-36).

Step 2. Check for lubricant discharge directly from pump.

Replace faulty pump (para 4-37).

Step 3. Check for damaged or leaking lubrication piping.

Replace damaged piping and repair any leaks.

Step 4. Check operation of lubricant dispenser.

Replace defective dispenser (para 4-19).

COMPRESSOR OPERATES AT OVER 175 PSI.

Step 1. Check pilot valve for proper adjustment.

Adjust pilot valve (para 4-27).

Step 2. Check air cylinder for damage or binded operation.

Replace air cylinder (para 4-30).

10.

WHEEL BRAKES FAIL TO APPLY.

Step 1. Check that towing vehicle brake system is operating correctly. (Towing Vehicle Technical Manual)

Repair towing vehicle brake system.

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