| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Part Description | Qty |
| A | 1P-2420 | Transmission Repair Stand | 1 |
| B | 138-7575 | Link Bracket | 2 |
| C | 138-7573 | Link Bracket | 2 |
| D | 1U-8758 | Pliers | 1 |
| E | 1P-0520 | Driver Group | 1 |
| F | 126-7175 | Push-Puller | 1 |
| 5P-4808 | Cap | 2 | |
| 6B-6684 | Nut | 2 | |
| 126-7176 | Forcing Screw | 1 | |
| 126-7177 | Puller Leg | 2 | |
| 126-7181 | Sliding plate | 4 | |
| 126-7182 | Nut for the Forcing screw | 1 | |
| 126-7183 | Crossblock | 1 | |
| 4C-5654 | Threaded Adapter | 1 | |
| G | 1P-1859 | Retaining Ring Pliers | 1 |
| H | 5F-7343 | Puller Group | 1 |
| J | 6V-3822 | Bolt | 1 |
| K | 6V-5844 | Bolt | 1 |
| L | 8T-9405 | Bolt | 1 |
| M | 5F-4764 | Pry Bar | 1 |
Start By:
- Remove the saw pump. Refer to Disassembly and Assembly, "Piston Pump (Saw) - Remove".
- Remove the main hydraulic pump. Refer to Disassembly and Assembly, "Piston Pump (Main Hydraulic) - Remove".
| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates. |
| NOTICE |
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Failure to properly assemble parts or failure to follow established procedures can lead to damage to the parts and assembly. To avoid damage to parts, always identify and mark the parts so that they can be installed into the same location. Never force parts during assembly. Keep parts clean and lubricated. |
| NOTICE |
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Keep all parts clean from contaminants. Contamination of the hydraulic system with foreign material will reduce the service life of the hydraulic system components. To prevent contaminants from entering the hydraulic system, always plug or cap the lines, fittings, or hoses as they are disconnected. Cover any disassembled components and clean them properly before assembly. Clean the hydraulic system properly after any major component exchange or especially after a component failure, to remove any contamination. |
- Thoroughly clean the outside of the main hydraulic pump prior to disassembly.
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Illustration 1 g01123647 - Fasten the main hydraulic pump to Tooling (A), as shown.
- Remove drain plug (1), and drain the oil from the main hydraulic pump into a suitable container for disposal.
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Illustration 2 g01123648 - Remove bolts (2) and manifold (3).
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Illustration 3 g01123653 - Remove tube assembly (4).
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Illustration 4 g01125157 - Remove bolts (5) that hold the head assembly.
- Fasten Tooling (B) and a suitable lifting device to head assembly (6), as shown.
- Remove the head assembly from the main hydraulic pump. The weight of head assembly (6) is approximately
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Illustration 5 g01123657 Show/hide table
Personal injury can result from being struck by parts propelled by a released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to release the spring force.
- Remove plug (7) and the O-ring seal.
- Remove bolts (8) and cover (9).
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Illustration 6 g01123658 - Remove O-ring seal (10) and O-ring seal (11).
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Illustration 7 g01123714 - Remove cap (12).
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Illustration 8 g01123715 - Remove nut (14) and screw (13) for cover (9).
- Repeat Steps 9 through Steps 13 for the other cover.
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Illustration 9 g01123660 - Remove bolts (15), control housing (16), and control housing (17) evenly.
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Illustration 10 g01123661 - Remove spring retainers (18) from control housing (16).
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Illustration 11 g01123662 Show/hide tablePersonal injury can result from being struck by parts propelled by a released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to release the spring force.
- Remove bolts (19) and control housing (17).
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Illustration 12 g01123663 - Remove valves (20) and valves (21).
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Illustration 13 g01123664 - Remove spring retainers (22).
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Illustration 14 g01123665 - Remove springs (23).
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Illustration 15 g01123667 - Remove O-ring seals (24) and bushings (25).
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Illustration 16 g01123675 Show/hide tablePersonal injury can result from being struck by parts propelled by a released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to release the spring force.
- Remove cap (27) and valve (26).
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Illustration 17 g01123863 - Remove nut (29), screw (28), and backup ring (30).
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Illustration 18 g01123676 - Remove spring (31).
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Illustration 19 g01123677 - Remove spring retainer (32), spring (33), spring retainer (34), and O-ring seal (35).
- Repeat Steps 22 through Steps 25 for the opposite side.
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Illustration 20 g01123678 - Remove springs (36) and spring retainers (37).
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Illustration 21 g01123679 - Remove O-ring seals (38), O-ring seals (40), springs (39), and spring retainers (41).
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Illustration 22 g01123681 - Remove bolts (42).
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Illustration 23 g01123682 - Remove piston (43).
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Illustration 24 g01123690 Show/hide table
Illustration 25 g01123692 Note: Raise the temperature of screw (44).
- Remove set screw (44) from piston (45).
- Remove pin (46) from piston (45).
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Illustration 26 g01117561 - Remove dowels (47) from the main pump housing.
- Remove port plates (48) from each pump rotating group.
Note: Port plates (48) are lapped to the barrel. Keep port plates (48) with each rotating group.
Show/hide tableNOTICE In order to ensure that each piston assembly is installed into its original bore, identify and mark each piston assembly, retaining plate and the barrel before removing the piston assembly.
To avoid damage to the barrel assembly parts, do not allow the parts to separate from the assembly during removal or installation.
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Illustration 27 g01117562 - Remove barrels (49) from each rotating group.
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Illustration 28 g01117563 - Remove spacers (50), and bevel spring washers (51) from the center bore of each barrels (49).
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Illustration 29 g01117564 - Remove gasket (52).
- Remove socket head screws (53) from each retaining plates (54).
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Illustration 30 g01117565 - Remove centering pins (55) and retaining plates (54) for each rotating group.
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Illustration 31 g01117567 - Remove pistons (56) for each rotating group.
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Illustration 32 g01117568 - Remove two rings (57) from each pistons (56).
- Pistons (56) must not have any scratches or pits on the surface.
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Illustration 33 g01117571 - Remove plug (58) from the main pump housing.
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Illustration 34 g01117572 - Install Tooling (J) into the threaded hole.
- Tighten the bolt in order to remove the upper pump rotating group from the main pump housing.
- Remove the main pump housing from Tooling (A) and turn over the main pump housing.
- Refasten the main pump housing to Tooling (A).
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Illustration 35 g01124061 - Remove upper rotating group (59).
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Illustration 36 g01117569 - Install Tooling (K) in the end of lower pump rotating group (60).
- Drive the lower pump rotating group upward until the lower pump rotating group rests loosely in the pump housing.
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Illustration 37 g01117570 - Attach Tooling (C) and a suitable lifting device to the top of the lower pump rotating group (60) in order to completely remove the lower pump rotating group from the pump housing.
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Illustration 38 g01117573 - Use Tooling (D) in order to remove retaining ring (61).
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Illustration 39 g01117574 - Remove shim (62) from the pump housing.
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Illustration 40 g01117575 Show/hide table
Illustration 41 g01117576 - Use Tooling (E) and a suitable hammer in order to remove the lip seal (63).
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Illustration 42 g01117577 - Remove bolts (65).
- Remove pilot pump (64) from the main pump housing.
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Illustration 43 g01117580 - Remove O-ring seals (66) from the pilot pump.
- Disassemble the pilot pump. Refer to Disassembly and Assembly, "Gear Pump (Pilot) - Disassembly".
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Illustration 44 g01117581 - Fasten Tooling (F) to shaft (68).
- Remove shaft (68) and bearing (67) from the pump housing.
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Illustration 45 g01117582 - Use a suitable press in order to remove bearing (67) from shaft (68).
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Illustration 46 g01117584 - Use Tooling (L) in order to remove key (69) from shaft (68).
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Illustration 47 g01117585 - Remove gear (70) from the main pump housing. Slide the gear to the center of the housing and remove the gear from the top of the housing.
Note: The gear is not symmetrical. Make sure that you mark the gear orientation before the gear is removed.
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Illustration 48 g01117588 - Use Tooling (M) in order to remove bearing (71).
Disassembly Procedure for the Lower Pump Rotating Group
- Use Tooling (G) in order to remove retaining ring (72) from the lower pump rotating group.
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Illustration 50 g01117592 - Remove plate (73).
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Illustration 51 g01117593 - Use Tooling (H) and a suitable press in order to remove bearing cone (74), bearing cup (75), shim (76), bearing cup (78), bearing cone (77), spacer (79), and bearing cup (80) from the shaft.
- Place Tooling (H) on the outer edge of the bearing cup (80).
Note: Do not push on the bearing cage.
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Illustration 52 g01117594 - Remove spacer (81).
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Illustration 53 g01117595 - Use Tooling (H) and a suitable press in order to remove bearing cone (82) from the shaft.
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| Illustration 49 | g01117591 |
Disassembly Procedure for the Upper Pump Rotating Group
- Use Tooling (G) in order to remove retaining ring (83) from the shaft.
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Illustration 55 g01117599 - Remove plate (84) from the shaft.
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Illustration 56 g01117600 - Use Tooling (H) and a suitable press in order to remove bearing cone (85), bearing cup (86), shim (87), bearing cup (88), bearing cone (89), spacer (90), and bearing cup (91) from the shaft.
- Place Tooling (H) on the outer edge of the bearing cup (91), as shown.
Note: Do not push on the bearing cage.
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Illustration 57 g01117602 - Remove spacer (92).
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Illustration 58 g01117604 - Use Tooling (H) and a suitable press in order to remove bearing cone (93) from the shaft.
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| Illustration 54 | g01117598 |
