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Page Title:
Compressed Air and Brake System Troubleshooting - continued |
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 TM 9-2320-386-24-1-1
0014 00
Compressed Air and Brake System Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step
2.
Disconnect governor signal line from adapter.
Step
3.
Remove adapter from air governor.
Step
4.
Install tee on air governor.
Step
5.
Connect test gauge to tee and governor signal line to tee.
Step
6.
Direct assistant to start engine (TM 9-2320-386-10) and allow air supply to build to normal
operating pressure.
Step 7. Compare air pressure reading indicated on test gauge to air pressure indicated on
instrument panel gauge.
a. If test gauge reading is below 85 psi (586 kPa), adjust governor (WP 0170 00).
b. If governor adjustment will not increase governor signal line pressure above 85 psi
(586 kPa) on test gauge, replace air governor (WP 0170 00).
END OF TESTING!
4. LOW OR NO READING ON AIR PRESSURE GAUGE, AND WARNING BUZZER SHUTS OFF
Test 1. Check air supply pressure to air pressure gauge.
Step 1. Stop engine and open all air reservoir drainvalves and allow brake system air pressure to
vent. Close air reservoir drainvalves.
Step 2. Disconnect air supply line from air pressure gauge adapter.
Step 3. Connect air supply line to test gauge.
Step 4. Start engine (TM 9-2320-386-10) and allow air pressure to build to normal operating
pressure.
Step 5. Check test gauge reading.
a. If reading is low or zero, check air supply line for bends, kinks, or leaks. Repair or
replace air supply line if bent, kinked, or leaking (WP 0167 00).
b. If reading is above 85 psi (586 kPa) on test gauge, replace air pressure gauge
END OF TESTING!
5. WARNING BUZZER FAILS TO SOUND ON LOW PRESSURE (BELOW 60 PSI [414 kPa])
Refer to Electrical Troubleshooting, WP 0011 00.
6. FRONT WHEEL DRIVE DOES NOT ENGAGE (FRONT WHEEL DRIVE LOCK-IN SWITCH ENGAGED)
Step 1. Start engine (TM 9-2320-386-10) and allow air pressure to build to normal operating
pressure.
Step 2. Inspect lines and hoses for air leaks.
a. If air leaks are found, repair as required (WP 0167 00 or TM 9-247).
b. If no leaks are found, perform test 1.
Test 1. Check front axle engagement air cylinder supply line pressure.
Step 1. Stop engine and open all air reservoir drainvalves and allow brake system air pressure to
vent. Close air reservoir drainvalves.
Step 2. Disconnect supply line from air cylinder elbow.
Step 3. Remove elbow from air cylinder.
Step 4. Install tee on air cylinder.
Step 5. Connect test gauge to tee and connect supply line to tee.
Step 6. Start engine (TM 9-2320-386-10) and allow air pressure to build to normal operating
pressure.
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