WRENCH 0065075 - Caterpillar

AIR COMPRESSOR GOVERNOR
1. Adjustment screw. 2. Locknut.6. If necessary, make an adjustment to the air compressor governor as follows: a. Remove the rubber cover on top of the governor.b. Loosen locknut (2) on adjustment screw (1).c. Turn the adjustment screw counterclockwise to make the cutout pressure higher. One turn of the adjustment screw changes the pressure approximately 20 psi (140 kPa). The cut-in pressure will change the same amount.7. If the adjustment screw does not change the cutout pressure, the unloading valves in the air compressor are not working correctly.8. If the cut-in to cutout pressure difference is not correct, the governor is not working correctly.Air Relief Valve
AIR RELIEF VALVEThe air relief valve opens at 150 psi (1030 kPa) and has no adjustment.Pressure Protection Valve
1. Make sure the pressure air is released from the tractor reservoirs by opening the rear drain valve.2. Close the drain valve.3. Start the engine.4. Hold the air horn valve down.5. When the air horn operates, read the pressure on the test gauge. The horn will operate when the pressure protection valve opens.6. The pressure protection valve must open at 75 psi (520 kPa).7. Stop the engine.
PRESSURE PROTECTION VALVE
1. Junction block. 2. Pressure protection valve.Inversion Valve
The operational test of the inversion valve is dependent upon correct operation of the emergency or parking and emergency brake control valve.1. Start the engine and let the pressure go up to the cutout pressure.2. Stop the engine.3. Move the lever on the emergency or parking and emergency brake control valve to the RELEASE (OFF) position.4. Slowly open the rear drain valve.5. Read the pressure on the test gauge at which the emergency brakes activate.6. The emergency brakes must activate at about 40 psi (280 kPa) pressure.
INVERSION VALVE
1. Inversion valve.7. Close the rear drain valve.8. As the pressure increases, the inversion valve must begin to exhaust air pressure and release the emergency brakes at approximately 70 psi (480 kPa). Make sure the emergency brake control valve is in the OFF (pushed in) position.9. If the inversion valve does not apply or release the brakes at the given pressures, install new valve.Emergency Brake Control Valve
1. Start the engine and let the pressure go up to cutout pressure [120 5 psi (830 35 kPa)].2. With the control knob for the emergency brake in the OFF position (pushed in), stop the engine.3. Push the brake pedal rapidly several times, until the control knob automatically moves to the ON position.
INSTRUMENTS
1. Air pressure gauge. 2. Emergency brake control valve.4. Read the pressure on the gauge.5. The correct pressure to automatically engage the emergency brakes is 40 5 psi (280 35 kPa). If the pressure on the gauge is not correct, the operation of the control valve is not correct.6. Disassemble the control valve and check for worn or damaged parts.7. If this does not correct the problem, install a new valve.8. Remove the gauge.Governor Override Valve
1. Start the engine and let the pressure go up to cutout pressure.2. Push the