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 148 of 1207
TM 9-2320-361-20
Table 2-3. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Install adapter (7) in trailer brake supply hose (6).
Step 4. Connect test gage (8) to adapter (7).
Step 5. Direct assistant to start engine (TM 9-2320-361-10) and allow air supply to build to normal
operating pressure.
NOTE
●
Service brake air pressure and airbrake hand control air pressure
must not be checked at the same time.
●
Air pressure must be held and maintained for pressure to
equalize in air-hydraulic cylinder with air system pressure.
Step 6. Direct assistant to fully apply and hold service brakes or pull down on trailer airbrake
hand control (TM 9-2320-361-10).
Step 7. Check test gage (8) reading and compare with reading on instrument panel gage.
a.
b.
NOTE
Air pressure gage on instrument panel has a maximum pressure
scale of 120 psi. If old governor has been replaced with new
governor, air pressure may exceed maximum pressure reading on
instrument panel gage.
If reading is lower than instrument panel gage reading, perform test 2.
If reading compares with instrument panel gage, check trailer brake system for proper
operation (TM 9-2320-213-14).
Step 8. Reinstall quick-disconnect coupling (5).
a.
b.
c.
d.
e.
Disconnect test gage (8) from adapter (7).
Remove adapter (7) from trailer brake supply hose (6).
Install quick-disconnect coupling (5) to trailer brake supply hose (6).
Close all airbrake valves (TM 9-2320-361-10).
Start engine (TM 9-2320-361-10) and ensure airbrake system pressurizes to normal
operating pressure
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