AUTOMATIC BLADE CONTROL ARRANGEMENT 6G6560 - Caterpillar

Table 9
Pressure Plate Measurements
Pump and Motor Group Number Minimum Pressure Plate Thickness
1 10.82 mm (0.426 inch)
2 9.70 mm (0.382 inch)
3 7.89 mm (0.311 inch)
Illustration 69 g03393490
Carbon deposits on the bronze face
Illustration 70 g01422198
Measure pressure plate flatness.
USE AGAINUse the plate again after the carbon is removed by ultrasonic cleaning. Small surface marks on the bronze face can be removed by a procedure known as "touch lapping". To touch lap, cover surface plate 7B-0337 with 180 grit crocus cloth. Wet the cloth thoroughly with clean petroleum-based solvent. Place the part that is being touch lapped on the wet cloth with the surface that is being touch lapped facing down on the cloth. Move the part in the shape of the number "8". Wash the part in clean solvent after touch lapping. Allow the part to dry at room temperature.Be sure that the plate is not bent. Check thickness according to Table 9. Check for pressure plate flatness by holding the two plates together with the bronze side facing each other. If a 0.18 mm (0.007 inch) feeler gauge fits between the two plates, the plates are no longer acceptable.
Illustration 71 g03424785
Scratches in the pressure plate
USE AGAIN
Illustration 72 g01422201
Step in the pressure plate
USE AGAINUse again if the step can be removed by touch lapping and if the plate has an acceptable thickness according to Table 9.
Illustration 73 g01516920
Erosion, near the pressure equalization chamfer
USE AGAIN
Illustration 74 g01421108
Smearing on the bronze face
DO NOT USE AGAIN
Illustration 75 g01421110
Pitting on the pressure plate
USE AGAINUse again if the plate has an acceptable thickness according to Table 9.Miscellaneous Parts
Cleaning Procedure
Clean miscellaneous parts such as bushing supports, couplings, isolation plates, and support rings with clean petroleum-based solvent.Note: Never reuse old seals. Always use new seals.Inspection Procedure
Illustration 76 g03426810
Damaged coupling
USE AGAINReuse if 75 percent of each spline is still in acceptable condition.
Illustration 77 g03426816
The tip of the isolation plate is broken. Isolation plates are not found on all pumps. Some of the Group 2 pumps and motors have isolation plates. The pump and motor part numbers for Group 2 are 145-3996, 145-3997, 186-5430, 188-3304, 207-8611, 212-5948, 223-3750, 223-3751, 223-3753, 231-6587, 237-7419, and 289-3530.
DO NOT USE AGAIN
Illustration 78 g03426829
The isolation plate was damaged during assembly. Isolation plates are not found on all pumps and motors. Some of the Group 2 pumps and motors have isolation plates. The pump and motor part numbers for Group 2 are 145-3996, 145-3997, 186-5430, 188-3304, 207-8611, 212-5948, 223-3750, 223-3751, 223-3753, 231-6587, 237-7419, and 289-3530.
DO NOT USE AGAINTest Procedure
For the correct break-in procedure, refer to Bench Test Procedure, REHS1832, "Bench Test Procedure for Gear Pumps".