| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Part Description | Qty |
| A | 1P-0510 | Driver Group | 1 |
| B | 1P-1861 | Retaining Ring Pliers | 1 |
| C | 136-1452 | Retaining Ring Pliers As | 1 |
| D | 1U-7600 | Slide Hammer Puller | 1 |
| E | 1P-1859 | Retaining Ring Pliers | 1 |
| F | 1P-1857 | Retaining Ring Pliers | 1 |
| G | FT-2981 | Spanner Wrench | 1 |
Start By:
- Remove the hydraulic drive pump. Refer to Disassembly and Assembly, "Hydraulic Drive Pump - Remove".
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
Note: Regular maintenance and frequent inspections are routine precautions. Practice preventive maintenance before damage occurs. Preventive maintenance can help to avoid a failure. If a failure occurs, an accurate diagnosis of the cause can prevent a recurrence. Information is available to analyze failures of the piston pump and the motor. Refer to Special Publication, SEBD0641, "Analyzing Axial Piston Pump and Motor Failures".
Note: Many times, the installation of new parts is not necessary. The installation of used parts during reconditioning is acceptable. Used parts can result in a substantial cost reduction. Information is available on reusing the piston pumps and the motors. Refer to Guideline For Reusable Parts, SEBF8032, "Piston Pumps and Motors". During reconditioning, correct any conditions that might have caused the original failure.
Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism. Dirt and contaminants can damage the components of the pump or the motor. All disassembly and assembly procedures must be performed on a clean work surface. Clean all the interior components in clean solvent. Dry all the interior components with compressed air. Plug ports and plug hoses on the machine during repair.
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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, "AVSpare Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on AVSpare products. Dispose of all fluids according to local regulations and mandates. |
Note: The hydraulic oil must be contained in the proper manner. Refer to Special Publication, NENG7004, "Contamination Control Catalog".
- Remove bolts (1). Remove charge pump (2).
- Remove O-ring seal (3). Remove gear set (4). Keep the gear set together in order to ensure proper installation of the gear set.
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Illustration 3 g00580966 - Remove bushing (5). Note the orientation of the bushing. The bushing must be installed in the original location.
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Illustration 4 g00580969 - Remove plate (6). Note the position of the plate.
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Illustration 5 g00580995 - Remove shaft (7). Remove O-ring seal (8).
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Illustration 6 g00581004 - Remove retaining ring (9) from the shaft. Remove key (10) from the shaft.
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Illustration 7 g00581009 - Remove bolts (11). Remove head assembly (12).
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Illustration 8 g00581016 - Remove O-ring seals (13) from the head. Remove O-ring seal (14) from the head.
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Illustration 9 g00581023 Typical example Show/hide table
Illustration 10 g00581022 - Use Tooling (A) in order to remove bushing (15).
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Illustration 11 g00581027 - Remove bushing (16).
Note: Mark orientation of groove in bushing (16) for later installation of new bushing into the original location.
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Illustration 12 g00794209 Note: Mark the position of the port plate for installation purposes. The notch in the port plate must face the two valves on the head assembly.
- Remove port plate (17) and bearing (18), if necessary.
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Illustration 13 g00999084 - Remove plugs (19), (20), and (21) from the head.
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Illustration 14 g00999085 - Remove O-ring seals (22) from plugs (19), (20), and (21).
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Illustration 15 g00722813 - Remove valve (23) from the head.
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Illustration 16 g00581200 - Disassemble the valve, as follows: O-ring seal (26), backup ring (25) and O-ring seal (24).
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Illustration 17 g00581207 - Remove valve (27) from the head. Refer to Step 15 for the disassembly procedure.
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Illustration 18 g00581224 - Remove bolts (28). Remove cover assembly (29). Repeat for the other side.
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Illustration 19 g00581225 - Remove O-ring seal (30). Remove valve (31).
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Illustration 20 g00581264 - Remove bolts (32). Remove cover (33).
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Illustration 21 g00581276 - Remove gasket (35). Remove bolts (34). Remove valve assembly (36).
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Illustration 22 g00581281 - Remove O-ring seals (37).
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Illustration 23 g00581282 - Remove O-ring seal (38). Remove O-ring seal (39). Remove O-ring seals (40).
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Illustration 24 g00581734 - Remove barrel assembly (41) from the pump housing. Keep the barrel assembly together with the pistons.
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Illustration 25 g00581740 - Mark the location of the pistons in the barrel assembly. Remove pistons and plate (42) from the barrel assembly.
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Illustration 26 g00581773 - Remove spring retainer (43).
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Illustration 27 g00581780 - Remove shim (44). Remove springs (45). Note the position of the springs. The springs must be installed in the same position for proper clearance.
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Illustration 28 g00581784 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.
- Use Tooling (B) and a suitable press in order to remove retaining ring (46).
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Illustration 29 g00581786 - Remove washer (47), spring (48), and washer (47) from the barrel assembly.
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Illustration 30 g00581792 - Use Tooling (C) in order to remove retaining ring (49).
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Illustration 31 g00581821 - Use Tooling (D) in order to remove seal (50).
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Illustration 32 g00581830 - Use Tooling (C) in order to remove retaining ring (51).
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Illustration 33 g00581848 Show/hide table
Illustration 34 g00581850 - Remove shaft assembly (52). It may be necessary to use a soft faced hammer in order to remove the shaft.
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Illustration 35 g00581928 - Use Tooling (E) in order to remove retaining ring (53).
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Illustration 36 g00581934 - Use a suitable press in order to remove shaft assembly (52) from bearing (54).
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Illustration 37 g00581942 - Remove swashplate assembly (55).
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Illustration 38 g00999846 - Remove plate (56) from the swashplate. Remove rods (57) from the swashplate.
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Illustration 39 g00582435 - Remove bearings (58).
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Illustration 40 g00582451 Show/hide table
Illustration 41 g00582457 Show/hide table
Illustration 42 g00999847 - Remove bearing cradles (59). Remove plug (61) and retainer (60) on both sides of the pump housing.
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Illustration 43 g00582463 Show/hide table
Illustration 44 g00582491 - Remove bolts (62). Remove cover (63) with valve assembly (64).
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Illustration 45 g00582495 - Remove bolts (65). Remove cover (66).
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Illustration 46 g00582504 - Remove O-ring seal (67) from the cover.
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Illustration 47 g00794220 - Remove nut (68). Unscrew the cover from the valve assembly.
Note: The valve assembly must be adjusted in the assembly procedure. Refer to Testing and Adjusting , RENR3991 for the proper procedure.
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Illustration 48 g00794221 - Remove O-ring seal (69).
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Illustration 49 g00794223 Ring (71) is on the opposite end. - Remove O-ring seal (72). Remove ring (70) and ring (71) from each side.
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Illustration 50 g00582619 Show/hide tablePersonal injury can result from parts and/or covers under spring pressure.
Spring force will be released when covers are removed.
Be prepared to hold spring loaded covers as the bolts are loosened.
- Use a suitable press to relieve the pressure on the spring. Use Tooling (F) in order to remove retaining ring (73).
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Illustration 51 g00582622 - Use a suitable press and Tooling (G) to relieve the pressure on the spring. Remove spacer (74). Slowly release the pressure on the spring.
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Illustration 52 g00582628 - Remove retainer (75).
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Illustration 53 g00582652 - Remove springs (76) and (77).
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Illustration 54 g00582656 - Remove retainer (78). Repeat Steps 45 through 49 for the other side of the valve.
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| Illustration 1 | g00999845 |
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| Illustration 2 | g00716074 |
Note: Mark the location of the charge pump on the head assembly. Crescent (M) of gear set (4) must face toward the valves for installation purposes. The valves are indicated by arrows.
