Table 3-3. Operator Troubleshooting

TM 5-4210-233-14&P-1

Table 3-3. Operator Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

APU

APU FAILS TO CRANK

Step 1. Check for battery switch in cab set to OFF.

Set battery switch to BOTH.

Step 2. Check for batteries low on charge.

Charge batteries.

APU CRANKS BUT WILL NOT START

Step 1. Check for empty fuel tank.

Refuel vehicle.

Step 2. Check for intake air too cold to enable initial combustion.

Use manifold preheater (see para 2-16 .).

APU RUNNING UNEVEN AND STALLS FREQUENTLY

Step 1. Check for almost empty fuel tank.

Refuel vehicle.

Step 2. Check for truck batteries low on charge making alternator hard to drive.

Start main engine to charge truck batteries.

If main engine won't start, refer to Unit Maintenance.

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