PUSH ARM GP 3132621 - Caterpillar

Relief Valve Test (Truck)
Lower the body and stop the engine. After the engine stops move the control lever to RAISE and LOWER positions, then put the lever in the FLOAT position.
LOCATION FOR RELIEF VALVE TEST
1. Hoist cylinder (left). 2. Plug in valve (oil line connection).Remove plug (2) in the valve (oil line connection) on the rod end of hoist cylinder (1). Some oil will run out when the plug is removed before the 5P3501 Adapter Assembly with the 5S4648 Hose Assembly, the 1S8937 Valve and the 7S8714 Pressure Gauge are installed in the plug opening.Start the engine and lift and lower the body many times to get the temperature of the hydraulic oil to more than 100° F (38° C).Run the engine at high idle speed and move the control lever to the RAISE position. After the body has been lifted to dump position, look at the gauge and move the control lever and hold it in the RAISE position. The high indication on the gauge is the pressure setting of the relief valve. The correct setting for the relief valve is 2350 + 50 or - 0 psi (16 200 + 345 or - 0 kPa). Do not keep the control lever in RAISE position, at the relief valve pressure setting, for more than 5 seconds.Relief Valve Test (Tractor)
Move the control lever to the FLOAT position until the hydraulic component, on the unit pulled by the tractor, stops its movements. Stop the engine, move the control lever to each position and then put the control lever in the FLOAT position.Install the 7S8714 Pressure Gauge on one end of the 5S4648 Hose Assembly and the 5S4965 Pressure Plate on the other end.Disconnect one of the hoses from the hydraulic tank at the hose junction for the pulled unit and install the pressure plate (hose and gauge). It is necessary to use longer bolts through the flange when the pressure plate is between the hose flange and the junction.Start the engine and move the control lever to each position again and again to get the temperature of the hydraulic oil to more than 100° F (38° C).Run the engine at high idle speed and move the control lever to the position that puts hydraulic oil through the hose where the pressure gauge is installed. Hold the lever in this position and look at the pressure gauge. The high indication on the gauge is the pressure setting of the relief valve. The correct setting of the relief valve is 2350 + 50 or - 0 psi (16 200 + 345 or - 0 kPa). Do not keep the control lever in RAISE position, at the relief valve pressure setting, for more than 5 seconds.If the setting of the relief valve is not correct, make a record of the indication on the gauge and make an adjustment for the relief valve.Adjustment of Relief Valve
Start and run the engine and move the control lever to the FLOAT position for approximately 20 seconds.