TM   9-2320-273-20 ALPHABETICAL   INDEX   (Continued) Subject, Para Subject,  Para Torque  Rods,  10-26 Torque  Table,  3-9 Towing  Eyes,  11-9 Tractor   Protection   Valve,   9-26 Trailer  Brake  Valve Description,   2-62 Maintenance,   9-18 Trailer  Connector  Brake  Lines  and  Couplings (See Brake System ) Trailer   Couplings,   Electric,   5-55 Trailer  Hand  Brake  Valve (See  Trailer  Brake  Valve) Trailer   Hand   Control   Valve (See Trailer Brake Valve) Trailer   Supply   Valve Description,   2-62 Maintenance,  9-17 Transmission Air  Charging  Valve,  6-12 Breather,  6-9 Control  Heater,  6-14 Control  Lines,  6-11 Description,   2-12 Neutral  Safety  Switch,  5-75 Oil  Heater,  5-88 Oil  Temperature  Gage,  5-59 Oil  Temperature  Sending  Unit,  5-76 Oil  Service,  6-9 Ratio  Selector,  6-12 Screen  Filter,  6-9 Troubleshooting,   6-5,   6-6 Troubleshooting Axles,  8-5 Backup  Lamps,  5-18 Battery  Charging,  5-11 Battery  System,  5-7 Blackout   Lighting   System,   5-19 Brakes,  9-5 Compressed  Air  System,  9-5 Engine, 4-5 Engine  Retarder,  5-10 Ether   Quick-Start,   5-9 Frame,  11-5 Gages, and Sending Units, 5-13 Headlamps, 5-14 Marker  Lamps,  5-15 Miscellaneous  Electrical,  5-20 Parking  and  Tail  Lamps,  5-16 Power Transfer Case, 7-5 Propeller  Shafts,  8-5 Starting  System,  5-8 Steering  System,  10-5 Stop  and  Turn  Signal  Lamps,  5-17 Suspension,  10-5 Symptom   Index,   3-8 Transmission,  6-5,  6-6 Warning  Lamps  and  Alarms,  5-12 Wheels, 10-5 Winch,  12-5 Turbo   Air   Inlet Description,   2-25 Maintenance,  4-27 Turbocharger Description,   2-25 Turbocharger   Air   Inlet (See  Turbo  Air  Inlet) Turbo   Outlet   Pipe Description,   2-30 Maintenance,   4-34 Turn  Signals Control,   5-58 Description,   2-46 Lamps,  Front,  5-45 Lamps, Rear, 5-46 Troubleshooting,    5-17 Turn   Signal   Switch   (Control) (See Turn Signals) U Universal  Joints  (Drive  Train) Inspect, 8-11 Maintenance.  8-11 Index-13