MOTOR GP-PISTON 1756469 - Caterpillar

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 pressure in the hydraulic system. Refer to Testing and Adjusting, "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. Refer to Illustration 5.
Illustration 6 g03700775
Pump compartment
(1) Pressure tap (delivery pressure for drive pump)
(2) Pressure tap (delivery pressure for idler pump)
(3) Pressure tap (power shift pressure)
(4) Delivery line for drive pump
(5) Delivery line for idler pump
Disconnect delivery line (4) from the drive pump.
Install seal (6) and blocking cover (D16) to the end of the delivery line.
Assemble and install rectangular seal (D15), adaptor (D14), seals (D4), half flange (D13), washer (D12), bolt (D13), fitting (D10), seal (D17), plug (D18) and fitting (D5) on the drive pump.
Disconnect delivery line (5) from the idler pump.
Install seal (6) and blocking cover (D16) to the end of the delivery line.
Assemble and install rectangular seal (D15), adaptor (D14), seals (D4), half flange (D13), washer (D12), bolt (D13), fitting (D10), seal (D17), plug (D18) and fitting (D5) on the idler pump.
Illustration 7 g03700772
Swing motor
(7) Makeup line
(8) Seal
(9) Elbow
Disconnect makeup line (7) from elbow (9) at the swing motor.
Assemble and install seals (D20), tees (D21), couplings (D19), seals (D4), and fittings (D5) to elbow (9) at the swing motor.
Install seal (8) and makeup line (7) to tee (D21).
Remove 311-1362 Vacuum Cap and install the filler cap for the hydraulic tank.
Connect portable hydraulic tester (D1) and test hoses between coupling assembly at the drive pump and coupling assembly at the swing motor.
Connect portable hydraulic tester (D2) and test hoses between coupling assembly at the idler pump and coupling assembly at the swing motor.
Attach a 41,368 kPa (6,000 psi) pressure sensor to pressure tap (1) for delivery pressure of the drive pump. Attach a 41,368 kPa (6,000 psi) pressure sensor to pressure tap (2) for delivery pressure of the idler pump.
Attach a 3447 kPa (500 psi) pressure sensor to pressure tap (3) for power shift pressure.
Install tooling (C) on the engine to monitor engine speed. Test Procedure
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.
To prevent personal injury and/or equipment damage from failed lines or components while the hydraulic test equipment is returned to the open flow position, slowly open the hydraulic test