587R Pipelayer Machine Systems Main Control Valve - Disassemble Caterpillar

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.

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Illustration 1	g01393481

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) .

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

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

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Illustration 2	g01244109

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

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Illustration 3	g01244110

5. 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) .

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

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Illustration 4	g01244112

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

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Illustration 5	g01244113

8. 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) .

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Illustration 6	g01244115

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

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Illustration 7	g01244117

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

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

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Illustration 8	g01244118

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

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

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Illustration 9	g01393491

14. 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.

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Illustration 10	g01244121

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

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

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Illustration 11	g01244122

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

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Illustration 12	g01244123

18. 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.