315D, 318D and 319D Excavators Machine Systems Main Hydraulic Pump - Assemble Caterpillar

Assembly Procedure

Note: If a failure occurs, an accurate diagnosis of the cause can prevent a recurrence. Information is available to analyze failures for piston pumps and motors. Refer to Special Publication, SEBD0641, "Analyzing Axial Piston Pump and Motor Failures".

Note: Inspect all parts. If any parts are worn or damaged use new parts for replacement. The installation of used parts during reconditioning is acceptable. Reuse and salvage information is available on piston pumps. Refer to Guideline For Reusable Parts and Salvage Operations, SEBF8032, "Piston Pumps and Motors". During reconditioning, correct any conditions that might have caused the original failure.

Note: Check the O-ring seals, the gaskets and the seals for wear or for damage and replace the components, if necessary.

Note: Cleanliness is an important factor. Before assembly, thoroughly clean all parts with cleaning fluid. Allow the parts to air dry. Do not use wiping cloths or rags to dry parts. Lint may be deposited on the parts which may cause problems. Inspect all parts. If any parts are worn or damaged, install new parts. All disassembly and all assembly procedures must be performed on a clean work surface and in a clean hydraulic area. Keep cleaned parts covered and protected at all times.

Note: Apply a light film of hydraulic oil to all components before assembly.

Assembly Of Port Block

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Illustration 1	g00766353

1. Install bearings (11).
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   Illustration 2	g00766344

2. Install plugs (10) and the O-ring seals.
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   Illustration 3	g00766340

3. Install O-ring seals (9).
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   Illustration 4	g00766333

4. Install pressure reducing valve (8) and bolts (7). Tighten bolts (7) to a torque of 9.8 ± 0.3 N·m (86.73 ± 2.65 lb in).
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   Illustration 5	g00766259

5. Install the O-ring seals and plugs (6).

6. Install O-ring seal (5), cover (4), and bolts (3). Tighten bolts (3) to a torque of 55 ± 10 N·m (41 ± 7 lb ft).
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   Illustration 6	g00766257

7. Install port plates (2) onto port block (1).

Assembly Of Pump

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Illustration 7	g00765941

1. Install seal (24) with the seal case into the housing.
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   Illustration 8	g00765937

2. Install bearings (23).

3. Use Tooling (B) in order to install retaining rings (22).
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   Illustration 9	g00765934

4. Install bearing races (21).
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   Illustration 10	g00765932

5. Install gear assemblies (20) and spacers (19).
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   Illustration 11	g00765927

6. Secure the bearings with the dowel pins and install bearings (17). The bearings must be installed in the original locations and orientations that were marked during disassembly.

7. Use Tooling (C) in order to install retaining rings (18).
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   Illustration 12	g00765910

8. Install cradle (16) and bolts (15). Torque bolts (15) to a torque of 55 ± 10 N·m (41 ± 7 lb ft).
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   Illustration 13	g00765908

9. Use Tooling (B) in order to install retaining ring (14).
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   Illustration 14	g00995706

10. Secure bearings (17) with the dowel pins before installing swashplates (13). Install swashplates (13).
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    Illustration 15	g00765912

11. Install pistons (11) and retainer (10) as a unit into barrel (12). Be sure to install the components in the original locations that were marked during disassembly.
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    Illustration 16	g00765902

12. Install rotating groups (9) in the original locations.
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    Illustration 17	g00765898

13. Install O-ring seals (8) and install O-ring seal (7).
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    Illustration 18	g00765897

14. Install port block (6) and bolts (5). Tighten bolts (5) to a torque of 220 ± 30 N·m (162 ± 22 lb ft).
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    Illustration 19	g00765887

15. Install head group (4) in the original location. Install bolts (3). Torque bolts (3) to 95 ± 15 N·m (70 ± 11 lb ft). Repeat this Step for the other side of the pump group.
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    Illustration 20	g00765824

16. Install the gear pump (2) and bolts (1). Tighten bolts (1) to a torque of 55 ± 10 N·m (41 ± 7 lb ft).
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    Illustration 21	g00771785

17. Remove the main hydraulic pump from Tooling (A).

End By:

1. Install the pump control. Refer to Disassembly and Assembly , "Pump Control - Install".

2. Install the main hydraulic pump. Refer to Disassembly and Assembly , "Main Hydraullic Pump - Install".