FINAL DRIVE GP 4S6628 - Caterpillar

29. Install O-ring seal (54) on seat (53). Put clean SAE 30 oil on the O-ring seal.30. Install spring (56), ball (55) and seat (53). Use tool (A) to install snap ring (52). 31. Make sure the small O-ring seal is in position on the selector valve body. Make sure the O-ring seal is in position on cover (57). Put clean SAE 30 oil on the seals.32. Install spring (59), neutralizer valve spool (58) and cover (57). Install the two bolts that hold the cover in position. 33. Install valve (64), spring (63), retainer (62) and spiral ring (61) in priority reducing valve spool (65).34. Put shims (66) in position in the end of spool (65). Put clean SAE 30 oil on the outside diameter of spool (65).35. Install spring (67), spool (65) and cover (60) on the selector control valve. Step 36 is the assembly procedure for the spools for valve groups A through C and E through H.36. Install ball (69), spring (70) and retainer (71) in spool (68). Use tool (A) to install snap ring (72) in the end of the spool. The pressure control valve for each clutch is identified on the pressure control valve body by a letter on the valve body. Do not at any time mix the components between valve groups during disassembly or assembly. Valve group A is for clutch No. 1. Valve group B is for clutch No. 2. Valve group C is for clutch No. 7. Valve group E is for clutch No. 5. Valve group F is for clutch No. 4. Valve group G is for clutch No. 6. Valve group H is for clutch No. 3.37.