TM  10-3930-669-20 2-16.  DRIVE AXLE SYSTEM TROUBLESHOOTING (CONT). 1. DRIVE AXLE OVERHEATING. INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive (Item 1, Appendix B) Pressure Test Kit (Item 2, Appendix B) STE(Optional) (Item 14, Appendix B) References TM 10-3930-669-10 LO 10-3930-669-12 Equipment Condition Engine OFF (TM 10-3930-669-10) MAIN POWER switch OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) KNOWN INFO Engine temperature 105°F or over. Glow plug indicator operates. POSSIBLE PROBLEMS Parking brake dragging. Brake fluid faulty. Drive axle oil level incorrect. Master cylinder faulty. Drive axle faulty. Drive axle oil cooler ground wire faulty. Drive axle oil cooler faulty. Relay R7 ground wire faulty. Wire 29 to relay R7 faulty. Wire 73 faulty. Relay R7 faulty. Wire 29 to engine temperature switch faulty. Engine temperature switch faulty. Wire 71 faulty. Axle oil pump ground wire fault. Axle oil pump faulty. Relay R8 ground wire faulty. Wire 29 to relay R8 faulty. Wire 74 faulty. Relay R8 faulty. Wire 29 to drive axle temperature switch faulty. Drive axle oil temperature switch faulty. Wire 72 faulty. TEST OPTIONS Visual inspection. REASON FOR QUESTION This question eliminates a possible    problem    or    group    of possible     problems     determining where troubleshooting continues. 2-332