Table 4. Air-Operated Troubleshooting Procedures - continued

TM 9-2320-361-24-1

0010 00

COMPRESSED AIR AND BRAKE SYSTEM TROUBLESHOOTING (Contd)

Table 4. Air-Operated Troubleshooting Procedures (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. Start engine (TM 9-2320-361-10)

2. FRONT WHEEL

and allow air pressure to build up

DRIVE DOES NOT

to normal operating pressure.

ENGAGE (FRONT

WHEEL DRIVE LOCK- 2. Inspect lines and hoses for air

1. If air leaks are found, repair or

IN SWITCH

leaks.

replace as required (TM 9-243).

ENGAGED)

2. If no leaks are found, perform

test 1.

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

1. If reading is zero, replace front

gauge (4) and compare

wheel drive lock-in switch

reading to instrument panel

(WP 0135 00).

air pressure gauge.

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

9. Check air cylinder on transfer

cylinder (WP 0136 00).

for leaks.

0010 00-20