VALVE AS-CHECK 1786274 - Caterpillar

Typical Example1. Disconnect hoses (2), (5) and (7) from the pump drive.2. Remove the bolt at location (4). Move the clips and hose assemblies away from the pump drive.3. Remove guard (3) from the pump drive. Remove the four bolts that hold the hydraulic pump drive shaft (1) to the yoke assembly in the pump drive.4. Install tool (A) at location (4), and fasten a hoist to it. The weight of the pump drive is approximately 68 kg (150 lb).5. Remove four bolts (6) and the pump drive. The following steps are for installation of the pump drive.6. Put the pump drive in position with tool (A) and a hoist. Install bolts (6) that hold the pump drive in position. Remove tool (A).7. Put hydraulic pump drive shaft (1) in position on the yoke assembly of the pump drive, and install the bolts that hold it. Tighten the bolts to a torque of 55 7 N m (41 5 lb ft).8. Put guard (3) in position, and install the bolts that hold it.9. Connect hoses (2), (5) and (7).10. Put the two hose assemblies and clips in position at location (4), and install the bolt that holds them in place.End By:a. install transmission pump*b. install hoist and brake cooling pump* See the 793B Truck Power Train, Disassembly And Assembly Manual for this information.Disassemble Pump Drive
The photos shown are from a 777 truck. The procedures similar for the 793B Truck.Start By:a. remove pump drive
Typical Example1. Remove bolts and washers (1) that hold bearing cage (2) to the housing.2. Install two 1/2" -13 NC forcing screws (3), and remove the bearing cage. 3. Remove shims (5) and O-ring seal (6) from the inside of cage (2). Inspect the seal, and make a replacement if needed.4. Remove bearing cup (4) from the cage if a replacement is necessary. 5. Remove bearing cones and gear assembly (7) from the housing. 6. Use tooling (A) to remove bearing cones (8) from each side of the gear if a replacement is necessary. 7. Remove six bolts and washers (9) that hold the bearing cage to the housing. 8. Install two 1/2" - 13 NC forcing screws, and remove bearing cage (10). 9. Remove shims (13) and O-ring seal (12). Inspect the seal, and make a replacement as needed.10. Remove bearing cup (11) from the cage if a replacement is necessary. 11. Remove bearing cones (14) and (16) and gear (15). Remove bearing cones (14) and (16) from each side of the gear with tooling (A). 12. Remove yoke assembly (17) from the housing. 13. Remove the bolts from shaft (19), and install two 1/2" - 13 NC forcing screws. Remove the shaft and shims (18) from the gear and bearing assembly. 14. Remove spacer (20) and bearing (21) from shaft (19). The bearing slides off the shaft with hand pressure. Remove O-ring seal (22), and inspect it. Make a replacement of the seal if necessary. 15. Remove gear (23) and the bearing