VALVE GP-MAIN CONTROL 1111996 - Caterpillar

17. Use a screwdriver to remove piston rings (29) from the piston. 18. Remove seven screws (30) that hold the retainer plate to the drive shaft assembly. The screws were installed with Thread Lock, so they will be difficult to remove. Impact the screw heads first to break the seal, and remove by using additional leverage on the screwdriver as shown.19. Remove the retainer plate, center pin (31) and the ring that holds the center pin in position. 20. Check center pin (31) for scratches and pitting at areas (Y). Replace the center pin, if necessary.Assemble Axle Propel Motor
1. Measure the drive shaft and bearing assembly to determine the thickness of the shim that will be used under the shaft seal cover. Refer to the Testing & Adjusting Manual for the proper measuring procedure.2. Measure the center pin, spring collar, control block and control plate to determine the proper size spring collar that should be used for assembly. Refer to the Testing & Adjusting Manual for the proper measuring procedure. 3. Position the drive shaft and bearing assembly as shown. Put center pin (31), retainer washer (32) and retainer plate (33) in position on the drive shaft and bearing assembly. 4. Put 6V1541 Quick Cure Primer on seven screws (30) and let it dry. Put 9S3263 Thread Lock on the seven screws and install them loosely to hold retainer plate (33) to the drive shaft and bearing assembly. Put three pistons (27) in position to align retainer plate (33). Tighten seven screws (30) to a torque of 6 N m (53 lb ft). Remove the three pistons from the assembly.
All piston rings must be installed with the marks toward the flat end of the piston or the motor will not operate.
5. Piston rings (29) are spherical and must be installed with the marks toward the flat end of the piston. Use Tool (A) to install the upper piston ring.6. Use Tool (A) to install the lower piston ring with the marks toward the flat end of the piston. Repeat Steps 5 & 6 for all seven pistons.7. Rotate the piston rings so that the end gaps of the upper and lower piston rings are 180° apart. 8. The spring collar that was selected in Step 2 should be used at this time. Put spring collar (26) and four Belleville washers (25) into the center pin bore of cylinder block (24). 9. Put SAE 10W oil on seven pistons (27) and in the piston bores of the cylinder block. Install seven pistons (27) into the cylinder block as shown. 10. Put SAE 10W oil on the center pin and in the center pin bore of the cylinder block. Position the drive shaft and bearing assembly with the drive shaft horizontal. Position the cylinder block with the pistons horizontal. Make sure the Belleville washers stay in the proper position when the cylinder block is put in the horizontal position.11. Align center pin (31) with its bore in the cylinder block