TM 5-4220-233-14
Table 4-2. UNIT TROUBLESHOOTING (Continued).
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST OR INSPECTION/CORRECTIVE ACTION
2.
TRAILER LIGHTS ARE DIM, FLICKER OR DO NOT COME ON.
Intervehicular cable damaged.
Perform continuity check on cable and repair as required.
Ground wire #90 Inside electrical box damaged or has loose connection.
Check for damaged wire and proper connection.
Electrical box not properly grounded to chassis.
Perform continuity check between electrical box and chassis.
BRAKES
3.
WHEELS DO NOT ROLL WHEN SERVICING UNIT IS PULLED FORWARD.
Brake shoes adjusted too tight.
Check brake shoe adjustment and correct as required.
Brake shoes frozen to drum (cold weather).
Heat brake drum to thaw.
Emergency lever on surge actuator is engaged.
Disengage emergency lever.
Wheel bearings are seized.
Check bearings and replace as necessary.
4.
PARKING BRAKE DOES NOT ENGAGE WHEN HAND LEVER IS APPLIED.
Broken or stretched cable assembly.
Check cable(s) and replace as necessary.
5.
SERVICE BRAKES DO NOT ENGAGE WHEN SURGE ACTUATOR IS ENGAGED.
Brake shoes adjusted too loose or worn.
Check brake shoe adjustment and wear, correct as required.
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