RAIL AS-FUEL 3088426 - Caterpillar

Illustration 1 g00896077
Front Right Side of the MachineThe pressure reducing valve is located on the right side of the machine. In order to gain access to the valve, open the panel on the right side of the machine.
Illustration 2 g00735003
(1) Pressure Reducing Valve.The pressure reducing valve is mounted on the end of the steering and decking blade valve. Pressure reducing valve (1) supplies hydraulic oil to the accumulator (pilot oil), the differential lock valve, and the pilot valve of the hydraulic system.When the machine is operating, the hydraulic pump pumps oil from the hydraulic tank. Oil flows from the pump to the brake priority valve. Oil flows from the brake priority valve to the steering valve and the decking blade valve, the pressure reducing valve and the implement valves. Pressure reducing valve (1) controls the oil pressure of the pilot oil for the pilot valve.When the pressure of the hydraulic system is above 2760 kPa (400 psi), pressure reducing valve (1) shifts allowing oil to flow back to the hydraulic tank.
Illustration 3 g00710944
Access Panel on the Right Side
Illustration 4 g00719345
Pressure Tap that is Located on the ManifoldThe pressure can be checked at the pressure tap that is mounted on the block manifold. The manifold is located on the right side of the machine. In order to gain access to the pressure tap, open the access panel next to the right door.In order to check the pressure reducing valve, move an implement to a stalled position. The pressure should be 2760 70 kPa (400 10 psi).When the pressure of the hydraulic system is above 2760 kPa (400 psi), the pressure reducing valve shifts allowing oil to flow back to the hydraulic tank.While the implements are in the HOLD position the pressure for the pressure reducing valve will read the pump standby pressure. The pressure reducing valve will not shift because the supply pressure will be lower than the 400 psi setting of the pressure reducing valve.