Table 2-2. Troubleshooting - TM-10-3930-242-340034

TM 10-3930-242-34

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 2. Check for defective starter.

Step 2. Check for defective valves.

Repair or replace starter (para 3-11).

Repair or replace valves (para 3-20).

Step 3. Check for defective flywheel ring gear (para

Step 3. Check for low compression caused by broken

3-21).

or worn piston rings.

10. ENGINE GENERATOR AMMETER SHOWS LOW OR

Replace defective piston rings (para 3-26).

NO CHARGING RATE WHEN BATTERIES ARE

Step 4. Check for defective push rods or rocker arms.

LoW OR DISCHARGED.

Replace defective push rods or rocker arms

Step 1. Check for defective generator brushes.

(para 3-15).

Replace defective brushes (para 3-9).

Step 5. Check for proper functioning of governor.

Step 2. Check for defective voltage regulator.

Adjust or replace governor.

Repair or replace voltage regulator (para

4. ENGINE OVERHEATS.

3-10).

Step 1. Check for defective radiator.

Step 3. Check for defective armature.

Repair or replace radiator (para 3-8).

Replace defective armature (para 3-9).

Step 2. Check for defective water pump,

Step 4. Check for defective field windings.

Repair or replace water pump (para 3-8).

Replace defective field windings (para

Step 3. Check for cracked cylinder head.

Replace defective cylinder head (para

3-9),

AMMETER

11. ENGINE

GENERATOR

SHOWS

3-19),

CHARGE WHEN BATTERIES ARE FULLY

5. ENGINE EXHAUST SMOKE EXCESSIVE.

CHANGED.

Step 1. Check for defective fuel injector.

Repair or replace fuel injector (para 3-14),

Step 1. Check for grounded field winding.

Replace defective field winding (para 3-9).

Step 2. Check for restricted air intake.

Step 2. Check for defective voltage regulator.

Clean blower screen (para 3-4).

Repair or replace defective voltage reg-

Step 3. Check for low compression caused by broken

ulator (para 3-10).

or worn piston rings,

12. ENGINE GENERATOR OVERHEATS.

Replace defective piston rings (para 3-26).

Step 1. Check for grounded or shorted armature.

Step 4. Check for cracked or broken piston.

Replace defective armature (para 3-9).

Replace defective piston (para 3-26).

Step 2. Check for defective generator bearings.

6. ENGINE NOISY.

Replace defective bearings (para 3-9),

Step 1. Check for defective valves.

13. TRANSMISSION AND TORQUE CONVERTER

Repair or replace valves (para 3-20).

Step 2. Check for defective connecting-rod bearings.

OVERHEATS.

Step 1. Check for low oil level.

Replace defective bearings (para 3-26).

Service per lubrication order.

Step 3. Check for defective main bearings.

Step 2. Check for low coolant level in radiator.

Replace defective bearings (para 3-31).

Refill with coolant to proper level,

Step 4. Check for loose or broken piston pins.

Step 3. Check for airated oil (foaming).

Replace defective piston pins (para 3-26).

Drain and refill. Refer to lubrication

Step 5. Check for loose or defective flywheel.

order.

Tighten or replace flywheel (para 3-21).

Step 4. Check for clogged or dirty oil cooler.

7. ENGINE HAS LOW OR NO OIL PRESSURE.

Clean or replace oil cooler (para 3-3).

Step 1. Check for oil dilution caused by leaking fuel

14. TRUCK MOVES IN ONE DIRECTION ONLY.

line or injector.

Step 1. Check for defective control valve.

Correct leak or replace defective fuel in-

Repair or replace transmission control

jector (para 3-14).

valve (para 4-5).

Step 2. Check for defective oil pump,

Step 2. Check for transmission clutch shippage by

Repair or replace oil pump (para 3-2),

checking clutch pressures.

Step 3. Check for defective connecting-rod bearings.

Repair or replace transmission (para 4-2).

Replace defective connecting-rod bearings

15. ENGINE RUNS BUT TRUCK WILL NOT MOVE.

(para 2-26).

Step 1. Check control valve for proper adjustment.

Step 4. Check for loose or defective main bearings.

Adjust or repair control valve (para 4-5).

Replace defective main bearings (para

Step 2. Check for defective torque converter.

3-31),

Repair or replace torque converter (para

8. ENGINE OIL CONSUMPTION EXCESSIVE.

4-2).

Step 1. Check for broken or worn piston rings.

Step 3. Check for defective transmission assembly.

Replace defective piston rings (para 3-26).

Repair or replace transmission (para 4-2).

Step 2. Check for cracked, burned, or broken piston.

16. STEERING HYDRAULIC CYLINDER LEAKS.

Replace defective piston (para 3-26).

Step 1. Check for worn or damaged packing.

Step 3. Check for worn valve guides.

Replace defective packing (para 5-15).

Replace defective valve guides (para 3-20).

Step 2. Check for cracked or broken cylinder hous-

9. STARTER FAILS TO CRANK ENGINE.

ing.

Step 1. Check for defective engine safety circuit.

Replace defective housing (para 5-15).

Isolate circuit trouble and repair.

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