TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 156 of 1207
TM 9-2320-361-20
Table 2-3. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AIR-OPERATED ACCESSORIES
14. WINDSHIELD WIPERS INOPERATIVE OR OPERATE SLOWLY (GAGE AT NORMAL OPERATING PRESSURE)
Step 1. Start engine (TM 9-2320-361-10) and allow air pressure to build to normal operating pressure.
Step 2. Operate windshield wipers and inspect lines and hoses for leaks.
a. If air leaks are found, repair as required.
b. If no air leaks are found, perform test 1.
Test 1. Check windshield wiper motor supply line (9) pressure.
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Compress clamp (8) and disconnect windshield wiper supply line (9) from tee (7).
Install adapter (6) on test gage (5).
Connect adapter (6) to windshield wiper supply line (9) with clamp (8).
Start engine (TM 9-2320-361-10) and allow air pressure to build to normal operating pressure.
Operate windshield wipers to full on position (TM 9-2320-361-10).
Check reading on test gage (5).
a. If reading is lower than 55 psi (379 kPa), replace windshield wiper valve (para. 8-19).
b. If reading is 55 psi (379 kpa), perform test 2.
Test 2. Check windshield wiper motor (2) for clogs.
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Remove clamp (4) and hose (3) from windshield wiper motor (2).
Using wire, clean orifice (1) on windshield wiper motor (2).
Install hose (3) and clamp (4) on windshield wiper motor (2).
Start engine (TM 9-2320-361-10) and allow air pressure to buildup to normal operating
pressure.
Operate windshield wipers (TM 9-2320-361-10), if windshield wipers are still inoperative,
replace defective windshield wiper motor(s) (2) (para. 8-19).
2-71
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