TM 5-4220-233-14
Table 4-2. UNIT TROUBLESHOOTING (Continued).
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST OR INSPECTION/CORRECTIVE ACTION
5.
SERVICE BRAKES DO NOT ENGAGE WHEN SURGE ACTUATOR IS ENGAGED-Continued.
Air in brake system.
Bleed brake lines.
Leak in brake lines, hoses, or brake cylinders.
Inspect brake system for leaks, repair as required.
Bad master cylinder.
Replace master cylinder.
6.
WHEEL HUBS BUILD UP EXCESSIVE HEAT.
Oil level in hub(s) low.
Check fluid level and service as required.
Brake shoes adjusted too tight.
Check brake shoe adjustment and correct as required.
Hub retaining nut installed too tight.
Back off on nut as required.
Wheel bearings worn.
Check wheel bearings and replace as necessary.
7.
HUBS REQUIRE FREQUENT SERVICING.
Bad O-ring seal on filler cap.
Check O-ring and replace as necessary.
Sight glass cracked or gasket worn.
Check cap area for leaks and repair as required.
Hub oil seal worn.
Check rear area of hub for leaks and replace as required.
4-10
