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Page Title:
Table 2-2. Troubleshooting - Continued |
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 TM 10-3930-634-34
Table 2-2. Troubleshooting -- Continued
Table 2-2. Troubleshooting - Continued
MALFUNCTION
MALFUNCTION
TEST OR INSPECTION
TEST OR INSPECTION
CORRECTIVE ACTION
CORRECTIVE ACTION
18.
HYDRAULIC VALVES WILL NOT HOLD.
12.
ENGINE GENERATOR OVERHEATS,
Step 1. Check for scored valve spool.
Step 1. Check for grounded or shorted arma-
Replace defective valve spool (para 6-2 or
ture.
6-4).
Replace defective armature (para 3-7).
Step 2. Check for dirt or foreign matter in
valve.
Replace defective bearings (para 3-7).
TRANSMISSION AND TORQUE CONVERT-
Clean valve (para 6-2 or 6-4).
13.
ER OVERHEATS.
S t e p 3. Check for weak or broken detent
spring.
Step 1. Check follow oil level.
Service per lubrication order.
Replace defective spring (para 6-2).
Step 2. Check followcoolant level irradiator.
19.
TRUCK LOSES FOUR WHEEL DRIVE.
Refill with coolant to proper level.
Step 1. Check for defective or wrongly adjust-
ed transmission control cable.
Step 3. Check for aerated oil (foaming).
Drain and refill. Refer to lubrication order.
Adjust or replace cable (para 4-11).
Step 4. Check for clogged or dirty oil cooler.
Step 2. Check for defective shifter coupling.
Clean or replace oil cooler (para 3-5).
Replace defective shifter coupling (para
14.
TRUCK MOVES IN ONE DIRECTION ONLY.
5-8).
DIFFERENTIALS EXCESSIVELY NOISY.
20.
Step 1. Check for defective control valve.
Repair or replace transmission control
Step 1. Check for broken or worn bearing.
valve (para 4-7).
Replace defective bearing (para 5-7).
Step 2. Check for defective pinion and ring
Step 2. Check for transmission clutch slippage
by checking clutch pressures.
Replace defective ring and pinion gear
Repair or replace transmission (para 4-9).
15.
ENGINE RUNS BUT TRUCK WILL NOT
MOVE.
TRANSMISSION MAIN PRESSURE LOW.
21.
Step 1. Check control valve for proper adjust-
Step 1. Check for low oil level.
ment.
Add oil if low. Refer to the lubrication or-
Adjust or repair control valve (para 4-7).
der.
Step 2. Check for defective torque converter.
Step 2. Check for clogged strainer screen.
Repair or replace torque converter (para
Clean strainer screen (para 4-9).
4-5).
Step 3. Check for defective main pressure reg-
Step 3. Check for defective transmission as-
ulator spring.
sembly.
Replace defective spring (para 4-2).
Repair or replace transmission (para 4-9).
Step 4. Check for main pressure regulator
valve sticking open.
16.
STEERING HYDRAULIC CYLINDER LEAKS.
Rebuild main pressure regulator body as-
Step 1. Check for worn or damaged packing.
Replace defective packing (para 5-15).
sembly (para 4-2).
Step 5. Check for clutch cutoff valve sticking
Step 2. Check for cracked or broken cylinder
housing.
open.
Replace defective housing (para 5-15).
Rebuild control valve body assembly (para
Step 3. Check for scored piston rod.
Step 6. Check for aerated oil (foaming).
Replace defective piston rod (para 5-15).
Oil level high, or of improper grade. If
HYDRAULIC SYSTEM LOSES PRESSURE.
17.
high, drain to proper level. If improper
Step 1. Check for defective hydraulic control
grade, drain and fill. Refer to the lubrica-
valve.
tion order.
Repair or replace defective hydraulic con-
Step 7. Check for worn or damaged converter
trol valve (para 6-2, 6-3, 6-4, or 6-8).
charging pump .
Step 2. Check for defective hydraulic pump.
I f damaged, rebuild (para 4-3).
R e p a i r or replace defective hydraulic
pump (para 6-14 or 6-15).
2-3
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