TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 1126 of 1313
SECONDARY AIR SYSTEM FAILS TO MAINTAIN PRESSURE (NO MAJOR LEAKS, AIR CAN BE HEARD
ESCAPING INTO AIR INTAKE STACK, PARKING BRAKE APPLIED) - Continued
CONDITION/INDICATION
IS PROPER AIR PRESSURE AT SERVICE BRAKE PEDAL VALVE SECONDARY AIR SYSTEM DELIVERY
PORT?
DECISION
NO - Go to Step (4) to verify problem is solved.
YES - Replace service brake pedal valve (Volume 3, WP
0429), M936 (Volume 3, WP
0430). Go to Step (4)
to verify problem is solved.
STEP
4.
IS YOUR ORIGINAL AIR PRESSURE PROBLEM STILL PRESENT?
a.
Ensure vehicle is returned to normal operating condition.
b.
Check to see if your original air pressure problem still exists.
CONDITION/INDICATION
IS YOUR ORIGINAL AIR PRESSURE PROBLEM STILL PRESENT?
DECISION
YES - Notify supervisor.
NO - Problem fixed.
END OF WORK PACKAGE
TM 9-2320-272-23-1
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