TIP 4755503 - Caterpillar

Test on the Bench
If the test bench can be run at 1000 psi and at full pump rpm, find percent of flow loss using Formula I.If the test bench can not be run at 1000 psi at full pump rpm, run the pump shaft at 1000 rpm. Measure the pump flow at 100 psi (7.0 kg/cm2) (690 kPa) and at 1000 psi (70.0 kg/cm2) (6900 kPa). Use these values in the top part of Formula II. For the bottom part of the formula, run the pump shaft at 2000 rpm. Measure the pump flow at 100 psi. Relief Valves
A 2P8421 Adapter and parts from the 5S5123 Hydraulic Test Group are needed to test the pressure setting of the relief valves.Relief Valve for the Elevator
The engine must be stopped before the test gauge and the cover for the oil line are installed.Install the 4M5317 Reducing Bushing in the 5P3501 Adapter, then install both in the 2P8421 Adapter. Install the 7S8714 Pressure Gauge (0-4000 psi) on the 4S4648 Hose Assembly, then install the hose in the reducing bushing.
PRESSURE TEST LOCATION (Under the Machine)
1. Plug.The plug (1) in the line from the pump is under the front of the transmission and is near the left side of the frame.Hydraulic oil will run out when plug (1) is removed so immediately install the hose and gauge assembly when plug (1) is removed.
CONNECTIONS IN LINES TO ELEVATOR MOTOR
2. Bolt (four in the connection of the oil line for elevator forward).Remove bolts (2) and install the 5H4020 Cover in the connection for the oil line that goes into the hydraulic motor nearest the drive end. Use longer bolts through the connection when the cover is in the connection.When the test equipment is installed, start the engine and run it at low idle rpm. Slowly move the elevator lever to the FORWARD position for not more than 5 seconds. The high reading on the gauge is the pressure setting for elevator relief valve (3). Increase engine rpm, if necessary, to make this pressure test.The correct pressure setting for relief valve (3) is 2500 50 psi (175.8 3.5 kg/cm2) (17 250 345 kPa).
ELEVATOR RELIEF VALVE (Under the Machine)
3. Relief valve. 4. Locknut. 5. Adjustment screw.The elevator relief valve (3) is under the machine in front of the drive axle and near the left side of the frame. To adjust, loosen locknut (4) and turn adjustment screw (5) only a few degrees; clockwise to increase or counterclockwise to decrease the pressure setting. Tighten locknut (4) and then make another elevator relief valve test.When the pressure setting adjustment for the elevator relief valve is correct, stop the engine and remove the test equipment.Relief Valve in the Control Valve
The engine must be stopped before the test gauge is installed. Install the 4M5317 Reducing Bushing in the 5P3501 Adapter, then install both in the 2P8421 Adapter. Install the 7S8714 Pressure Gauge (0-4000 psi) on the 4S4648 Hose Assembly, then install the hose in the reducing bushing.
SCRAPER CONTROL