Table 3-1. Troubleshooting (Con't).
TEST OR INSPECTION
DRIVELINE LOCKING SYSTEM
DRIVELINE WILL NOT DISENGAGE (INDICATOR LIGHT STAYS ON)
WHEN INTERAXLE LOCKOUT (ALL-WHEEL DRIVE) CONTROL VALVE IS
MOVED TO UNLOCK (DISENGAGE) POSITION.
Ensure system has had enough time to disengage.
Leave interaxle lockout (all-wheel drive) in UNLOCKED
(DISENGAGE) position and wait for light to go off.
If indicator light remains on, excessive driveline windup may
have occurred. Back truck up slowly and check if indicator light
goes off. If indicator light remains on, notify Unit Maintenance.
ONE OR MORE LIGHTING SYSTEMS NOT WORKING.
Check position of switch(es). If vehicle is coupled to semitrailer
and problem is with semitrailer lighting system, check interve-
hicular cable connection.
Place switch(es) in ON position and blackout light switch to
NORMAL position. Connect intervehicular cable.
Perform semitrailer troubleshooting.
ENGINE COOLANT TEMPERATURE GAGE INDICATES ENGINE IS OVER-
DO NOT remove radiator cap unless engine is cold.
Remove radiator cap in two steps. First, place a thick
cloth over cap and slowly turn cap left to first stop.
Pause and allow pressure to escape. Turn cap further
left until it can be removed. This is a pressurized cool-
ing system and escaping steam, hot water, or coolant
will cause serious burns.
Check engine coolant level in radiator.
Add engine coolant as required (Appendix F).