315B Excavator Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the main hydraulic pump and the pump drive coupling. Refer to Disassembly and Assembly, "Main Hydraulic Pump - Remove" in this manual.

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Illustration 1	g00368938

1. Remove two socket head bolts (1) and pilot pump (2) from the main hydraulic pump. Remove the O-ring seal from the cover of the main hydraulic pump.

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Illustration 2	g00368939

2. Remove four socket head bolts (3) and pressure and flow compensator valve (4) from the rear body assembly.

3. Use the following procedure to disassemble pressure and flow compensator valve (4) .

   Note: Keep the parts of pressure and flow compensator valves (4) and (46) separate. Do not mix the components of the valves.

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   Illustration 3	g00368941

   1. Remove eight O-ring seals (6) and one O-ring seal (5) from the valve body.
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   Illustration 4	g00368945

   Note: There is slight spring pressure behind cover (8) .

   2. Remove four socket head bolts (7) and cover (8) from the valve body.
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   Illustration 5	g00369033

   3. Remove five O-ring seals (11), pin (12), sleeve (10) and spring (9) from the valve body.
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   Illustration 6	g00369034

   4. Remove case (13) and the piston (not shown) from the valve body. Remove O-ring seal (14) from the case.
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   Illustration 7	g00369035

   5. Remove retaining ring (16), spring (15) and the seat from the valve body.
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   Illustration 8	g00369036

   Note: There is slight spring pressure behind cover (17) .

   6. Remove four socket head bolts (18) and cover (17) .
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   Illustration 9	g00369037

   7. Remove O-ring seal (22), spring (21), spring (22) and spring seat (19) from the valve body.
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   Illustration 10	g00369038

   8. Remove four socket head bolts (23) and cover (24) .
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   Illustration 11	g00369039

   9. Remove three O-ring seals (26) and seal (25) from cover (27) .
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   Illustration 12	g00369040

   10. Remove two retaining rings (28) from the valve body.
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   Illustration 13	g00369041

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   Illustration 14	g00369042

   11. Install a suitable sized bolt in the threaded hole of plug (29) and plug (30). Pull the bolt in order to remove the plug. Remove plug (29) from the valve body.
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   Illustration 15	g00370398

   12. Remove plug (30) from the valve body. Remove O-ring (31) from plug (30) .

   Note: Plug (30) has a guide pin.

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   Illustration 16	g00369513

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   Illustration 17	g00369512

   13. Remove lever assembly (32) and spool (33) .
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   Illustration 18	g00369514

   14. Remove spool (34) from the valve body. Remove seal (35) from spool (34) .
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   Illustration 19	g00369517

   15. Remove lever assembly (37) and spool (36) after the pin (not shown) has been removed.
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   Illustration 20	g00369518

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   Illustration 21	g00369519

   16. Remove spool (39) from the valve body. Remove lever assembly (38) .
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   Illustration 22	g00369520

   17. Use a punch to remove retainer (41), spring (40) and spring seat (42). Remove seal (43) from retainer (41) .
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   Illustration 23	g00369692

   18. Remove fitting (44) from the valve body. Remove the O-ring seal from the fitting.

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Illustration 24	g00369696

4. Remove four socket head bolts (45) and pressure and flow compensator valve (46) from the main hydraulic pump.

5. Disassemble pressure and flow compensator valve (46). Follow the procedure in Steps3.a through 3.r.

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Illustration 25	g00369697

6. Remove four socket head bolts (47), and carefully remove cover (48) from the support plate of the front body assembly.

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Illustration 26	g00369699

7. Remove O-ring seal (50) and lip type seal (49) from cover (48) .

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Illustration 27	g00369700

8. Remove four socket head bolts (51), support plate (52) and shaft assembly (53) from the front body assembly.

9. Remove shaft assembly (53) from support plate (52) .

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Illustration 28	g00369702

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Illustration 29	g00493370

10. Remove retaining ring (55) from shaft (61). Use a press to push shaft (61) out of spacer (59), race (58) and bearing (54) .

11. Remove spacer (57) and washer (56) from the shaft.

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Illustration 30	g00369705

12. Separate front body assembly (62) from the block assembly.

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Illustration 31	g00369852

13. Remove swash plate (63) and two O-ring seals (64) from front body assembly (62) .

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Illustration 32	g00369873

Note: Do not allow the components to fall apart during the removal of barrel assembly (65). The piston assemblies should be reinstalled in assembly's original bore in the retainer and barrel assembly.

14. Carefully remove barrel assembly (65) from the front body assembly. Remove O-ring seals (66) .

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Illustration 33	g00369875

15. Remove pin assembly (67) from the front body assembly. Remove plate (68) from the front body assembly.

16. Use the following procedure to disassemble barrel assembly (65) .
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    Illustration 34	g00369933

    1. Put marks on nine piston assemblies (69) in order to identify the assembly's location in retainer (71) and barrel (70). Remove the retainer and piston assemblies from the barrel. Separate the piston assemblies from the retainer.

    2. Remove retainer guide (74) and washer (73) from the barrel.

    3. Remove nine springs (72) from the barrel.
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    Illustration 35	g00369972

    4. Remove four socket head bolts (75), and separate block assembly (76) from the rear body assembly.
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    Illustration 36	g00370012

    5. Remove O-ring seals (77) and (78) from the block assembly (76) .
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    Illustration 37	g00370013

    6. Remove plate (79) from both sides of block assembly (76) .
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    Illustration 38	g00370014

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    Illustration 39	g00370015

    7. Remove two bearings (80) and coupling (81) from the block assembly.
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    Illustration 40	g00370016

    8. Remove four socket head bolts (82), and remove cover (83) from the rear body assembly.
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    Illustration 41	g00370017

    9. Remove O-ring seal (84) from cover (83) .

       Note: Keep the parts of the front body assembly and rear body assembly separate. Do not mix the components of the front and rear body assemblies.

    10. Follow the procedure in Steps 6 through 16.c in order to disassemble the rear body assembly of the main hydraulic pump.