CYLINDER ASSEM. 3J6659 - Caterpillar

Illustration 53 g01180406Comparison of a new vane tip on the right side with one vane tip subjected to aeration on the left. The vane in the center is showing wear from contamination.
Illustration 54 g01180408
Vane tip with acceptable wear
Use Again
Illustration 55 g03364253
Vane which is showing wear from contamination.
Use AgainIf the vane to slot clearance is within tolerance, and scratches cannot be felt with a fingernail, the vane is acceptable to use again.
Illustration 56 g01180411
Illustration 57 g01180412Appearance of a new vane on the left compared to the frosted appearance of a vane subjected to fluid contamination on the right. Note the worn edge of the vane on the right side. Refer to Illustration 57.
Illustration 58 g03364256
Appearance of galled vanes which is an indication of over pressure
Do not use again
Illustration 59 g01180415The appearance of a new vane is shown on the left. The frosted appearance of a vane subject to fluid contamination shown on the right. Refer to Illustration 59.
Illustration 60 g03364258
Vane end with scratches which can be felt with a fingernail
Do not use again
Illustration 61 g03364262
Vane tip with excessive wear
Do not use againShaft
Illustration 62 g03364275
Worn drive splines
Wearing of the shaft splines is caused by lack of engine or transmission oil through the pump drive passages. Refer to Illustration 62.Do no use again
Illustration 63 g03364276
Example of fretting
Fretting is caused by a lack of lubrication at the spline drive end of the pump shaft. Refer to Illustration 63.Do not use again
Illustration 64 g01180424
Grooves in the seal area which can be felt with a fingernail
(J) Shoulder radiusUse Again - After the seal area is salvaged according to the correct procedure. Refer to the "Procedure to Salvage Shaft Seal Area" section in this document.Procedure to Salvage Shaft Seal Area
Grooves in the seal area which can be felt with a fingernail can be removed to make the part usable again. Refer to Illustration 64.Note: Follow the metal spray manufacturer directions carefully in the application of metal spray to the shaft seal area.The salvage procedure is as follows:
Measure the shaft outside diameter at the seal area and at the shoulder radius (J) if present. Make a note of each dimension.
Worn or damaged surfaces designated as salvageable by chrome plating can also be salvaged by a metal spray process. Metal spray is an acceptable method of restoring a surface to the original size. Each step in the procedure is critical in achieving the desired coating bond and the surface finish. See Reuse and Salvage Guideline, SEBF9236, "Fundamentals of High Velocity Oxygen Fuel (HVOF) Spray for Reconditioning Components".
Grind the seal area to the diameter which was measured in Step 1 to 0.05 mm (0.002 inch). The surface finish must be 0.40 µm (16.00 microinch) to 0.80 µm (32.00 microinch) to be acceptable. The wheel radius must be the same or greater than the shoulder radius (J) as measured in Step 1.