587R Pipelayer Machine Systems Main Control Valve - Disassemble Caterpillar


Main Control Valve - Disassemble
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1.1. Disassembly Procedure

Disassembly Procedure

Start By:

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

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.




    Illustration 1g01393481

  1. Remove charging valve (1), dead engine hook lowering valve (2), pilot relief valve (3), pilot shutoff valve (4), dead engine boom lowering valve (5), and boom kickout valve (6) .

  1. Remove shuttle valves (7) and (9) .

  1. Remove boom interlock valve (8) and hook interlock valve (10) .



    Illustration 2g01244109

  1. Remove backup ring (11), O-ring seal (12), O-ring seal (13), nut (15), and coil assembly (14) from charging valve (1) .



    Illustration 3g01244110

  1. Remove backup rings (16), O-ring seals (17), O-ring seal (18), nut (20), and coil assembly (19) from dead engine hook lowering valve (2) .

  1. Repeat Step 5 for dead engine boom lowering valve (5). Refer to Illustration 1.



    Illustration 4g01244112

  1. Remove O-ring seal (21), backup ring (22), and O-ring seal (23) from pilot relief valve (3) .



    Illustration 5g01244113

  1. Remove backup ring (24), O-ring seal (25), screen (26), O-ring seal (27), nut (29), and coil assembly (28) from pilot shutoff valve (4) .



    Illustration 6g01244115

  1. Remove backup rings (30), O-ring seals (31), O-ring seal (32), nut (34), and coil assembly (33) from boom kickout valve (6) .



    Illustration 7g01244117

  1. Remove backup rings (35), O-ring seals (36), and O-ring seal (37) from shuttle valve (7) .

  1. Repeat Step 10 for shuttle valve (9). Refer to Illustration 1.



    Illustration 8g01244118

  1. Remove backup rings (38), O-ring seals (39), and O-ring seal (40) from boom interlock valve (8) .

  1. Repeat Step 12 for hook interlock valve (10). Refer to Illustration 1.



    Illustration 9g01393491

  1. Remove boom brake release valve (41), hook brake release valve (42), check valve (43), check valve (44), and piston (45) (not shown). Refer to Illustration 12.



    Illustration 10g01244121

  1. Remove backup rings (46), O-ring seals (47), and O-ring seal (48) from boom brake release valve (41) .

  1. Repeat Step 15 for hook brake release valve (42). Refer to Illustration 9.



    Illustration 11g01244122

  1. Remove backup ring (49), O-ring seal (50), and O-ring seal (51) from check valve (43) .



    Illustration 12g01244123

  1. Remove backup ring (52), O-ring seal (53), and O-ring seal (54) from check valve (44). Note the orientation of piston (45) for assembly purposes.

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