TM 5-3805-261-20PRINCIPLES OF OPERATION. (cont)1-23.AIR BRAKE SYSTEM.a.AirCompressorandReservoir(Figure 1-33). A gear driven two cylinder air compressor mounted at the leftforward side of the engine provides air pressure for the service brakes. A dual section air reservoir is connected by airlines and mounted under the rear of the vehicle. A governor controls the pressure.Figure 1-33.b.ServiceBrakes. A foot pedal operated air valve in the cab directs air pressure through air lines for engagingmultiple oil disc brake assemblies for each wheel, within the tandem and spindle housings. Refer to Appendix F for airsystem schematic.c.Parking/EmergencyBrake. Multiple oil disc type located in the transmission case. Manually actuated byforward movement of red lever on transmission control console. Lever engages parking brake and activates transmissionneutral lock to prevent machine movement. Brake is spring engaged and air disengaged. Can be used for emergencystopping if air supply fails.d.EmergencyBraking. Duel air system provides separate circuit at each tandem for safety. Malfunction ofone circuit leaves remaining circuit with at least half of original braking capacity. Refer to Appendix for air systemschematic.e.BladeCentershiftLockPin. Though not part of the air brake system, the centershift lock pin is mentionedhere because it also is operated by the air supply from the air brake system. The centershift lock pin is part of the bladesystem. Refer to paragraph 1-31 for location.1-36
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