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

ENGINE OPERATES WITH OIL PRESSURE BELOW 15 PSI

CAUTION

Troubleshoot engine for low oil pressure along with the steps below. Failure

to correct this problem can lead to serious engine damage.

Step 1. Test wiring harness (para 4-25).

Replace or repair harness (para 4-25).

Step 2. Replace oil pressure switch.

Step 3. Test oil pressure gauge (para 4-26).

Replace oil pressure gauge (para 4-26).

WINTERIZATION HEATER DOES NOT OPERATE

Step 1. Inspect wiring harness for damage and test (para 4-42).

Repair or replace harness (para 4-42).

Step 2. Test fuel pump (para 4-41).

Replace fuel pump (para 4-41).

Step 3. Test control box (para 4-40).

Replace control box (para 4-40).

Step 4. Replace heater (para 4-39).

COMPRESSOR FAILS TO BUILD UP OR MAINTAIN REQUIRED PRESSURE.

Step 1. Check drive belts for damage or slipping.

Adjust or replace drive belts (para 4-22).

Step 2. Check compressor pilot valve for proper adjustment.

Adjust pilot valve (para 4-27).

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