ELBOW 6G0584 - Caterpillar

Illustration 70 g03354048
Smearing on the bronze faceUse againUse again after smearing is removed by touch lapping.
Illustration 71 g03354063
Pitting on the pressure plateUse again if the plate has an acceptable thickness according to Table 6.Miscellaneous Parts
Procedure for Cleaning
Clean miscellaneous parts, such as bushing supports, couplings, isolation plates, and support rings, with clean solvent made from petroleum.Note: Never use seals again. Use new seals.Procedure for Inspecting
Illustration 72 g03397789
Damaged couplingUse againUse again if more than 75 percent of the length of each spline is still in acceptable condition.
Illustration 73 g01284445
Wear on the gear face of the bushing support (measure thickness).Use againUse again after wear is removed by touch lapping and if the part has an acceptable thickness according to Table 5.
Illustration 74 g03354076
Tip of isolation plate is broken offDo not use again
Illustration 75 g03354223
Isolation plate damaged during assembly.Procedure for Testing
This break-in test procedure should be used for rebuilt medium-pressure gear pumps.After replacing the ring or center sections of the 20, 25, HP7, HP8, FP7, or FP8 Series Gear Pumps, go through a break-in test. The procedure for pumps with aluminum bodies is different than the procedure for pumps with iron bodies.Note: Failure to use the correct procedure, aluminum or cast iron, could result in severe damage to the pump and hydraulic system.Procedure for Aluminum Bodies
Illustration 76 g01284465
Aluminum cycle with chip removal.Gear pumps with aluminum bodies. (51) Pressure (psi) (52) Speed (rpm) (53) 2400 rpm (54) Approx. 30 seconds (55) 90 cycles, 60 seconds (56) Time (57) Read flow rate (58) Stop the pump (59) Vent load Valve (60) Start the pump (61) Increase pressureNote: A 17225 kPa (2500 psi) system pump is shown in Illustration 76. Pumps in systems with pressure settings other than 17225 kPa (2500 psi) would use break-in pressures that would be 3445 kPa (500 psi) above normal system pressure.
Refer to Illustration 76. Operate the pump at 2400 rpm.
Slowly increase the pressure from 0 to 3445 kPa (500 psi) above the relief valve pressure in a 30 second period.
Cycle the pressure between the relief pressure plus 3445 kPa (500 psi) and 0 kPa (0 psi) 90 times in the next 60 seconds using a hand outlet valve or solenoid valve.
Increase the pressure to the application relief valve pressure and read the flow rate. The pass/fail flow rate is based on a minimum 92 percent volumetric efficiency. For narrow gear width units in a given series, the minimum allowable volumetric efficiency can be as low as 88 percent.
Stop the pump.
Vent the load valve.
Accelerate the pump to 2400 rpm.
Increase the pressure to the application relief valve pressure.
Stop the pump.
Vent the load valve.
Accelerate the pump to 2400 rpm.
Stop the pump motor.Procedure for Iron Bodies
Illustration 77 g01284481
Iron cycle with chip removal.Gear pumps with iron bodies. (62) Pressure (psi) (63) Speed (rpm) (64) 2400 rpm (65) Time (66) Off pressure time ( 1 to 3 seconds) (67) Increase pressure rate of 100 psi/sec (68) Read flow rateNote: The pressure must be increased gradually from 0 to 3445 kPa (500 psi) above the application relief valve pressure, with pauses every 1723 kPa