AXLE AR-FIXED 1178250 - Caterpillar

General Information
The air-on the run system is supported by two subsystems. They are:* The hydraulic subsystem.* The air subsystem.The hydraulic subsystem is separate from the machine hydraulic system. The machine hydraulic oil tank is the only shared system component. The hydraulic subsystem delivers oil flow to drive a motor coupled to the air compressor.The air system provides and controls the amount of air required to inflate or deflate the tires.Hydraulic Subsystem
The hydraulic subsystem consists of hydraulic pump (1), control valve (2), hydraulic motor (3) and relief valve (4).The hydraulic oil tank is the only component common to both the machine systems and the air-on-the-run system.The hydraulic subsystem is a closed circuit system. Hydraulic pump (1) is a gear pump that produces a flow of 26.5 liters/minute (7 gpm). The hydraulic pump is mounted on the engine and receives oil from the hydraulic oil tank. Oil from the hydraulic pump is sent to control valve (2). When the operator moves the air compressor On/Off switch to the "ON" position the air regulator will energize the solenoid valve in control valve (2) and send oil to the hydraulic motor.Relief valve (4) is mounted in the control valve. The relief valve limits the hydraulic system pressure to a maximum of 15 900 kPa (2300 psi).When the operator moves the air compressor On/Off switch to the "OFF" position the solenoid valve in control valve (2) is de-energized and oil is sent to the hydraulic oil tank. Hydraulic motor (3) is a gear motor that is coupled to the air compressor.Air Subsystem
The air subsystem consists of air pressure gage (1), distributor valve (2), air tank (3), air regulator (4), air compressor (5) and hold back valves (6). When the operator moves the air compressor On/Off switch to the "ON" position an electrical signal is sent to air regulator (4). If the air pressure in air tank (3) is less than 760 30 kPa (110 4 psi), the solenoid valve in the control valve will be energized. Oil will then flow from the control valve to the hydraulic motor and drives air compressor (5). When the air pressure in the air tank reaches 930 30 kPa (135 4 psi), air regulator (4) de-energizes the solenoid valve. Oil flow to the hydraulic motor is blocked and sent back to the hydraulic oil tank. When the operator moves the inflate/deflate switch to the "INFLATE" position an electrical signal is sent to the solenoid on distributor valve (2). The energized solenoid will shift the valve spool and allow air pressure to inflate the tires. When the operator moves the inflate/deflate switch to the "DEFLATE" position an electrical signal is sent to the other solenoid on distributor valve (2). The energized solenoid will shift the valve spool and allow the tires to deflate. Air pressure gauge (1) indicates the air pressure in the tires. Hold back valves (6) are located on each tire. The hold back valves prevent the air pressure from dropping below