Section II.  MAINTENANCE ALLOCATION CHART-Continued (1) (2) (3) (4) (5) G Assembly Group Maintenance Functions Tools and Remarks R equipment O A B C D E F G H I J K U C P A O I S L I R V R N N E A I N E R E E U S R D A B S P E R B M P T V J L R T L P H U B E E I U I A A A A A I E C S C S G T L C I U L R T T E T N E L E R L D Air Brake System (continued) Switch, low pressure O O Valve assy, quick release O O F 1209 Air Compressor Assembly Cornpressor assembly, air O C F F Governor assembly O F F Tanks, wet and dry O O 1211 Trailer Brake Connec- tions and Controls Couplings, quick disconnect   O O Manifold, tube C O Valves, relay and control C O F 13 WHEELS AND TRACKS 1311 Wheel Assembly Hub and drum assembly O O O O Wheels, pneumatic tire C O O 1313 Tires Tube C O O 14 STEERING 1401 Steering Assembly Gear assembly, steering O C F F Drag steering link assy O Rod, tie C O O O 1410 Hydraulic Pump or Fluid Motor Assembly Belt, "V” pum p drive. C C O Pump assembly. hydraulic C O O F Shaft and bearing assy F F F 1411 Hoses, Fitting O O 1412 Hydraulic or Air Cylinder Cylinder assy, hydraulic C O F Piston and shaft F F F 1413 Tanks, Reservoirs Reservoirs assembly C C O O 1414 Steering System Valves Spring seat; valve; relief O O Valve, assembly, steering C O F AGO 3059A A-2-13