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 943 of 1313
SPRING BRAKE WARNING LIGHT INOPERATIVE WITH SPRING BRAKE OVERRIDE ENGAGED - Continued
STEP
1.
IS SPRING BRAKE OVERRIDE WARNING LIGHT LAMP IN GOOD CONDITION?
a.
Visually inspect lamp and lamp holder for faulty condition.
T0110DAA
Figure 1.
Spring Brake Override Light.
b.
Check lamp holder for corrosion and damage.
c.
Replace lamp with one known to be operational (Volume 2, WP
0311).
NOTE
If spring brake override lamp operates, bulb was faulty.
d.
Check if spring brake override lamp operates.
CONDITION/INDICATION
IS SPRING BRAKE OVERRIDE WARNING LIGHT LAMP IN GOOD CONDITION?
DECISION
NO - Go to Step (5) to verify problem is solved.
YES - Go to Step (2).
STEP
2.
DOES SPRING BRAKE PRESSURE SWITCH OPERATE PROPERLY?
a.
Remove instrument cluster to access spring brake pressure switch (Volume 2, WP
0310).
b.
Disconnect both circuit 37 wires.
TM 9-2320-272-23-1
0112
0112-2
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