TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 180 of 1176
TM 9-2320-361-24-1
0010 00
0010 00-20
COMPRESSED AIR AND BRAKE SYSTEM TROUBLESHOOTING (Contd)
Table 4. Air-Operated Troubleshooting Procedures (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. FRONT WHEEL
DRIVE DOES NOT
ENGAGE (FRONT
WHEEL DRIVE LOCK-
IN SWITCH
ENGAGED)
1. Start engine (TM 9-2320-361-10)
and allow air pressure to build up
to normal operating pressure.
2. Inspect lines and hoses for air
leaks.
Test 1. Check front axle engagement
air cylinder supply line (1)
pressure.
1. Stop engine and open all drain
valves (TM 9-2320-361-10)
until brake system air is
completely drained.
2. Disconnect supply line (1)
from air cylinder elbow (3).
3. Remove elbow (3) from air
cylinder (2).
4. Install tee (5) on air
cylinder (2).
5. Connect test gauge (4) and
supply line (1) to tee (5).
6. Start engine (TM 9-2320-361-
10) and allow air pressure to
build up to normal operating
pressure.
7. Place front wheel drive lock-in
switch in ON position.
NOTE
Air pressure gauge on instrument
panel has a maximum pressure
reading of 120 psi. If old governor has
been replaced with new governor, air
pressure may exceed maximum
pressure reading on instrument panel
gauge reading.
8. Check reading on test
gauge (4) and compare
reading to instrument panel
air pressure gauge.
9. Check air cylinder on transfer
for leaks.
1. If air leaks are found, repair or
replace as required (TM 9-243).
2. If no leaks are found, perform
test 1.
1. If reading is zero, replace front
wheel drive lock-in switch
(WP 0135 00).
2. If test gauge (4) reading is lower
than instrument panel gauge
reading, and air can be heard
escaping from transfer case vent,
replace PTO (WP 0348 00).
If air leaks are found, replace air
cylinder (WP 0136 00).
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