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315B Excavator Machine Systems Caterpillar


Main Control Valve - Disassemble

Usage:

315B 1SW

Disassembly Procedure

Start By:

  1. Remove the main control valve. Refer to Disassembly and Assembly, "Main Control Valve - Remove" in this manual.

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NOTICE

Failure to properly assemble parts or failure to follow established procedures can lead to damage of the parts and assembly.

To avoid damage to parts, always identify and mark the parts so that they can be installed in the same location. Ensure that gear surfaces align. Never force parts during assembly.

    Note: Keep all of the internal parts of the main control valve clean and lubricated.

  1. Thoroughly clean the outside of the main control valve prior to disassembly.

  1. Put the main control valve on wood blocks. The weight of the main control valve is approximately 204 kg (450 lb).
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    Illustration 1g00375193

  1. Remove the remaining three hydraulic hoses (1) from the main control valve.
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    Illustration 2g00375196

  1. Remove fittings (2) from the main control valve. Replace O-rings (3) .
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    Illustration 3g00375197

  1. Remove two plugs (4) and plug (5). Replace the O-rings.
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    Illustration 4g00375198

  1. Remove plug (6) and replace the O-ring.
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    Illustration 5g00375199

  1. Remove spring (7), retainer (8) and ball (9) from the main control valve.
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    Illustration 6g00375292
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    Illustration 7g00375294
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    Illustration 8g00375295

  1. Remove five plugs (10) from the front of the main control valve. Remove spring (12) and valve (13) from the valve body. Remove the O-rings from the plugs. Replace the O-rings.

  1. Remove plugs (11). Remove spring (14) and valve (15). Remove the O-rings from the plug. Replace the O-rings.
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    Illustration 9g00375312

  1. Remove two plugs (16) and replace the O-rings.
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    Illustration 10g00375314

  1. Remove two plugs (17) and replace the O-rings.

  1. Remove two valves (18) on each end of the main control valve.
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    Illustration 11g00496272

  1. Disassemble valve (18). Remove O-ring (21), poppet (19), spring (22), and valve (20) .
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    Illustration 12g00496273
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    Illustration 13g00496274
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    Illustration 14g00496275

  1. Remove two bolts (25) and housing (23). Remove O-ring (26). Repeat for the remaining six housings (24) .
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    Illustration 15g00496276

  1. Remove two valves (27). Remove plug (28) .
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    Illustration 16g00496278

  1. Remove lower housing (29), O-ring (30) and O-ring (31) from the lower housing.
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    Illustration 17g00496279

  1. Remove valve (37) .

  1. Remove sleeve (40) from valve (37). Remove backup ring (36) and O-ring (35) from the sleeve.

  1. Remove valve (39) from the sleeve. Remove springs (34) and (38) .

  1. Remove O-ring (33) and backup ring (32) from valve (27) .
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    Illustration 18g00496280

  1. Replace O-ring (41) .
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    Illustration 19g00496282
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    Illustration 20g00496283

  1. Remove cap (42). Replace O-ring (45) .

  1. Remove rod (43), spring (46) and spring (44) from the main control valve.
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    Illustration 21g00496284

  1. Remove spool (47) .
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    Illustration 22g00496286

  1. Remove fitting (50). Replace the O-ring.

  1. Remove four bolts (48) and housing (49) .
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    Illustration 23g00496288

  1. Remove four small O-rings (51) from housing (49) .
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    Illustration 24g00496292

  1. Remove plug (53) and replace the O-ring. Remove spring (52) .
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    Illustration 25g00496290

  1. Remove fitting assembly (54) .
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    Illustration 26g00496295

  1. Replace the O-ring. Remove spring (59), valve (56) and spring (58) from housing (55) .
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    Illustration 27g00496296
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    Illustration 28g00496298

  1. Remove snap ring (60) and housing (55). Replace two O-rings (61) .
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    Illustration 29g00496299

  1. Remove plug (65) and replace the O-ring.

  1. Remove six socket head bolts (63) and two housings (62) .

  1. Remove coupler (64) and replace the O-ring.
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    Illustration 30g00496300
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    Illustration 31g00496301

  1. Remove four O-rings (66) and replace the O-rings.
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    Illustration 32g00496302

  1. Remove check valve (67) .
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    Illustration 33g00496303

  1. Remove backup ring (70), O-ring (71), O-ring (69), backup ring (68), backup ring (72), O-ring (73), and backup ring (74) .

  1. Replace backup ring (70), O-ring (71), O-ring (69), backup ring (68), backup ring (72), O-ring (73), and backup ring (74) .
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    Illustration 34g00496304
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    Illustration 35g00496305

  1. Remove eight housings (75). Replace O-rings (76) .

    Note: Make sure that identification marks are placed on all spool assemblies for installation purposes. Spool assemblies must be installed in the assembly's original location in order to ensure correct operation. Do not mix the components of the spool assemblies.

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    Illustration 36g00496306
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    Illustration 37g00496307

  1. Remove eight spool assemblies (77) .
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    Illustration 38g00496308

  1. Disassemble the spool assembly. Remove bolt (81), retainer (80), spring (83), spring (79), and retainer (82) from spool (78) .

    Note: The example of the disassembly is for a single spool assembly. The disassembly of all of the spool assemblies is identical.

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    Illustration 39g00496309

  1. Remove fitting (86). Replace the O-ring.

  1. Remove four socket head bolts (84), and remove housing (85). Replace the O-rings.
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    Illustration 40g00496310

  1. Remove pressure switch (88). Remove two socket head bolts (87) and housing (89) .
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    Illustration 41g00496311

  1. Replace O-ring (90) .
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    Illustration 42g00496312

  1. Remove spool assembly (91). Repeat Step 41 in order to disassemble spool assembly (91) .
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    Illustration 43g00496313
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    Illustration 44g00496314

  1. Remove four valves (92) .

    Note: Follow Step 16 through Step 20 in order to disassemble four valves (92) .

  1. Remove plug (93). Replace the O-ring.
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    Illustration 45g00496315

  1. Remove valve (94) .
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    Illustration 46g00496317
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    Illustration 47g00496318

  1. Remove O-ring (95) from valve (94). Remove lower housing (102). Remove valve (99), piston (101), spring (98) and spring (100) from the lower housing.

  1. Remove O-ring (97) and backup ring (96) from the valve (94) .
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    Illustration 48g00496319

  1. Remove plug (103). Replace the O-ring.
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    Illustration 49g00496360

  1. Remove ten plugs (104) and the check valves from the back of the main control valve. Replace the O-rings.
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    Illustration 50g00496361

  1. Remove eight bolts (105), and separate the main control valve in three separate sections.
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    Illustration 51g00496362

  1. Remove O-rings (106) from the left and the right sections of the main control valve. Replace the O-rings.

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