RETAINER AS 3T0740 - Caterpillar

LEFT SIDE OF SCRAPER BOWL
4. Floor (open). 5. Pin. 6. Hole.Air Pressure Gauge
8M2885 Pressure Gauge, 0 to 200 psi (0 to 1400 kPa).5S5123 Hydraulic Testing Group.1. Release the pressure air from the tractor reservoirs by opening the drain valves located on the left platform.2. Install the correct fitting and tee between the air compressor governor and the air line from the air tanks.
DRAIN VALVES FOR AIR TANKS3. Connect the hose assembly to the 1S8937 Valve from the test group. Connect the pressure gauge to the valve.
LOCATION TO INSTALL TEST EQUIPMENT4. Start the engine and let the pressure go up to the cutout pressure.5. Make a comparison of the pressure gauge on the machine with the test gauge.6. If the pressure on the gauge on the machine is more than 15 psi (105 kPa) different that the pressure on test gauge, install a new gauge.
If it is necessary to install a new gauge, stop the engine and open the drain valves until the pressure in the tractor reservoirs is released.
7. Do not disconnect the test gauge. It will be used in other tests.Air Compressor Governor
1. Start the engine and let the air pressure go up to the cutout pressure.2. Read the cutout pressure on the test gauge.3. Push the brake pedal rapidly several times.4. Read the cut-in pressure on the test gauge.5. The cut-in pressure is 95 to 100 psi (660 to 35 kPa). The cutout pressure is 120 5 psi (830 35 kPa).
AIR COMPRESSOR AND GOVERNOR
1. Air compressor. 2. Governor.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 the locknut on the adjustment screw.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
The 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 drain valves.2. Close the drain valves.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.Emergency Brake Control
1. Start the engine and let the air pressure go up to the cutout pressure.2. Stop the engine.3. Push the knob on the control valve for the emergency brakes to RELEASE position.4. Open the front drain valve.5. Read the pressure on the test gauge at which the emergency brakes activate.6. The emergency brakes must activate at 30 5 psi (205 35 kPa) pressure.7.