ACCUMULATOR GP-BRAKE 2435339 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines.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".
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Circuit diagram (1) Swing motor (2) Connector (top of swing motor) (3) Tee (4) Makeup line (5) Main control valves (6) Cap (7) Portable hydraulic tester (8) Pilot line (9) Pilot oil manifold (10) Pressure tap (11) Pressure gauge (12) Pilot pump (13) Multitach group (14) Engine (41) Swivel elbow
Install the following tools in accordance with the flow meter tool layout and the circuit diagram. Refer to Illustration 1 and Illustration 2.
Install multitach group (13) on engine (14) .
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Top of main control valves (8) Pilot line
Remove pilot line (8) from the connector that is located on top of main control valves (5). Install cap (6) on the connector.
Install port connector (40), seal (39), adapter (38), seal (34) and nipple assembly (36) to the end of pilot line (8) .
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Swing motor (1) Swing motor (2) Connector (4) Makeup line
Disconnect makeup line (4) from connector (2) at the top of swing motor (1) .
Assemble and install seals (30), tee (3), swivel elbow (41), coupling (37), seal (34) and nipple assembly (36) to connector (2) at the top of swing motor (1) .
Connect makeup line (4) to tee (3) .
Connect portable hydraulic tester (7) and test hoses between nipple assembly (36) at pilot line (8) and nipple assembly (36) at the swing motor.
Illustration 5 g00344078
Pilot oil manifold compartment (9) Pilot oil manifold (10) Pressure tap (15) Pilot relief valve
Install 6000 kPa (870 psi) pressure gauge (11) at pressure tap (10) on pilot oil manifold (9) .
Start the engine.
Place the machine controls at the following settings: Power Mode, engine speed dial "10" and AEC switch OFF. Make reference to Testing And Adjusting, "Operational Checks" for engine rpm settings.
Place the hydraulic activation control lever in the UNLOCKED position.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).
Check the pilot relief valve setting at pressure gauge (11). The pressure gauge should show a reading of 4100 200 kPa (595 29 psi). If the pilot relief valve setting is not within the specification, adjust pilot relief valve (15). Refer to Testing and Adjusting, "Relief Valve (Pilot) - Test and Adjust" for adjustment procedures for the pilot relief valve.
Illustration 6 g00344084
Portable hydraulic tester (flow meter) (7) Portable hydraulic tester (flow meter) (13) Multitach group (16) Valve (flow meter)
Turn valve (16) on portable hydraulic tester (7) clockwise until pressure gauge (11) at pressure tap (10) shows a reading of 4100 200 kPa (595 29 psi).
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