VALVE GP-LOAD CONTROL 2888571 - Caterpillar

Machine Preparation
Illustration 3 g03641950
Flow meter tool layout (1) Swing motor (2) Connector at swing motor (4) Makeup line (swing motor) (8) Pilot line (delivery line from the pilot pump) (9) Connector at pilot pump (10) Pilot filter (14) Pilot pump
Illustration 4 g03641953
Circuit diagram (1) Swing motor (2) Connector (4) Makeup line (5) Main control valve (8) Pilot line (9) Connector at pilot pump (10) Pilot filter (12) Engine (14) Pilot pump (40) Elbow (C) Multi - tool group (D1) Portable hydraulic tester (D16) Tee (D17) Plug
To prevent personal injury or equipment damage from failure of the hydraulic test equipment or associated circuit components because of blocked pump flow, make sure that the test equipment valves are fully open before starting the engine.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Position the machine on level ground.
Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".
Attach 311-1362 Vacuum Cap onto the hydraulic tank. Attach an air supply hose onto the assembly. Apply 276 to 414 kPa (40 to 60 psi). This procedure will pull a vacuum on the hydraulic system.
Install the following tools in accordance with the flow meter tool layout and the circuit diagram. Refer to Illustration 3 and Illustration 4.
Install multi - tool group (C) on engine (12) .
Remove pilot line (8) from connector (9) at pilot pump (14) .
Install seal (D12) and plug (D17) to the end of pilot line (8) .
Install seal (D12) and elbow (D11) to connector (9) at pilot pump (14) .
Install seal (D4) , coupling (D10) , seal (D4) and fitting (D5) to elbow (D11) .
Illustration 5 g03642108
Swing motor (1) Swing motor (2) Connector (4) Makeup line (D15) Elbow (D16) Tee
Disconnect makeup line (4) from connector (2) at swing motor (1) .
Assemble and install seals (D14) , tee (D16) , swivel elbow (D15) , coupling (D13) and fitting (D5) to connector (2) at swing motor (1) .
Remove 311-1362 Vacuum Cap and install the filler plug for the hydraulic tank.
Connect portable hydraulic tester (D1) and test hoses between nipple assembly (D5) at the pilot pump and coupling (D13) at the swing motor.Test Procedure
Start the engine.
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).
Illustration 6 g03641961
Portable hydraulic tester (flow meter) (16) Valve (flow meter) (D1) Portable hydraulic tester (flow meter)
Turn valve (16) on portable hydraulic tester (D1) clockwise until the pressure gauge on the portable hydraulic tester shows a reading of 4100 200 kPa