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TM 10-3930-632-34
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BRAKES
1.
BRAKES DRAG.
Step 1.
Inspect for broken or weak brake pedal return spring.
Replace spring (para 11-3).
Step 2.
Check for broken brake shoe return spring.
Replace spring (para 11-20).
Step 3.
Inspect brake drum for scored or rough condition.
Replace drum and brake shoe assemblies (TM 10-3930-632-12).
HYDRAULIC SYSTEM
1.
MAIN HYDRAULIC PUMP DOES NOT DELIVER OIL.
Step 1.
Check for broken pump shaft.
Overhaul pump (para 4-9).
2.
MAIN HYDRAULIC PUMP DOES NOT DEVELOP PRESSURE.
Step 1.
Check relief valve for stuck open condition.
Overhaul and clean pump (para 4-9).
3.
HYDRAULIC CYLINDERS WORK SLOWLY AT RATED ENGINE RPM.
Step 1.
Check for defective main control valve.
Overhaul control valve (para 4-15).
4.
HYDRAULIC CYLINDERS CHATTER WHEN OPERATING.
Step 1.
Inspect for defective cylinder.
Overhaul cylinder (para 4-2).
Step 2.
Check for defective hydraulic pump.
Overhaul pump (para 4-9).
5.
MAIN HYDRAULIC PUMP MAKES NOISE.
Step 1.
Check for air leak at pump shaft packing.
Replace shaft packing (para 4-9).
Step 2.
Inspect shaft packing for wear.
Replace shaft packing (para 4-9).
6.
LIFT AND TILT ACTION FAILS.
Step 1.
Check for low oil pressure.
Overhaul main hydraulic pump (para 4-9).
7.
OIL LEAK AT TOP OF LIFT CYLINDER.
Step 1.
Inspect lift piston seal for wear.
Replace cylinder seal (para 4-3).
Step 2.
Inspect cylinder wall for scored condition.
Overhaul cylinder (para 4-2).
8.
OIL LEAK AROUND TILT CYLINDER PISTON ROD.
Step 1.
Inspect seal for wear.
Replace cylinder seal (TM 10-3930-632-12).
Step 2.
Inspect piston rod for scored condition.
Overhaul cylinder (TM 10-3930-632-12).
TRANSMISSION
1.
TRUCK WILL NOT MOVE IN EITHER DIRECTION.
Step 1.
Check for lack of transmission oil pressure.
Clean transmission intake lines. Replace transmission oil pump (para 14-8).
2.
TRUCK WILL MOVE ONLY IN ONE DIRECTION.
Step 1.
Test for lack of pressure to directional selector (seals and preformed packings in directional selector possibly defective).
Overhaul transmission (para 14-6).
Step 2.
Directional selector discs not releasing, discs defective, or relief hob in drum clogged.
Overhaul transmission (para 14-6).
3.
TRUCK MOVES SLOWLY IN BOTH DIRECTIONS AT WIDE OPEN THROTTLE.
Step 1.
Check for low oil pressure (faulty inching valves, faulty relief valve, or faulty pump).
Repair or replace defective parts (para 14-6).
Step 2.
Check for clogged sump screen.
Clean sump screen (para 14-9).
4.
TRANSMISSION OVERHEATS.
Step 1.
Check for low directional selector pressure. Inching valve not functioning properly.
Overhaul transmission (para 14-6).
Step 2.
Inspect for defective selector seals.
Overhaul transmission (para 14-6).
Step 3.
Check for clogged sump screen.
Clean screen (para 14-9).
2-4

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