TM 5-3810-300-24 & P2
High quality anti-friction bearings are used to withstand required loads while oscillating at high speeds. These bearings
on the journal cross carry very high loads for their size. The full complement, roller-type (needle) bearings are generally
used because of their high capacity in a limited space. Bearings are individually sealed to provide retention of required
lubricants as well as to prevent the entry of foreign material.
Air for the various components of the Carrier and Superstructure is provided by the supply, front service, and rear service
reservoirs. A engine driven compressor supplies the reservoirs with air. The air required for Superstructure components
is transferred from the reservoirs by the pneumatic/hydraulic swivel. Air for Carrier components passes through tubing
and hoses. The hoses and tubing run along the Carrier frame to the components. Listed below are the Carrier
Components that are in the Air System.
Pressure Protection Valve
Auto Drain Valve
Double Check Valve
Single Check Valve
Spring Brake Control Valve
Stop Light Switch
E-6 Dual Brake Valve
The compressor is driven by the engine and is operating continuously while the engine is running. Actual compression of
air is controlled by the compressor unloading mechanism and the governor. The governor is generally mounted on the
compressor and maintains the Brake System air pressure to a preset maximum and minimum pressure level.
Intake and Compression of Air (Loaded). (Illus. 4-19 A and B). During the down stroke of the piston, a slight vacuum is
created between the top of the piston and the head, causing the flat circular inlet valve to move up and off its seat.
(Note the flat square discharge valve remains on its seat). Atmospheric air is drawn through the air strainer by the open
inlet valve and into the cylinder.