Main Control Valve - Disassemble
Disassembly Procedure
Start By:
- 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.
- 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) .
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Illustration 1 | g01244108 |
- Remove shuttle valves (7) and (9) .
- Remove boom interlock valve (8) and hook interlock valve (10) .
- Remove backup ring (11), O-ring seal (12), O-ring seal (13), nut (15), and cartridge assembly (14) from charging valve (1) .
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Illustration 2 | g01244109 |
- Remove backup rings (16), O-ring seals (17), O-ring seal (18), nut (20), and cartridge assembly (19) from dead engine hook lowering valve (2) .
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Illustration 3 | g01244110 |
- Repeat Step 5 for dead engine boom lowering valve (5). Refer to Illustration 1.
- Remove O-ring seal (21), backup ring (22), and O-ring seal (23) from pilot relief valve (3) .
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Illustration 4 | g01244112 |
- Remove backup ring (24), O-ring seal (25), screen (26), O-ring seal (27), nut (29), and cartridge assembly (28) from pilot shutoff valve (4) .
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Illustration 5 | g01244113 |
- Remove backup rings (30), O-ring seals (31), O-ring seal (32), nut (34), and cartridge assembly (33) from boom kickout valve (6) .
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Illustration 6 | g01244115 |
- Remove backup rings (35), O-ring seals (36), and O-ring seal (37) from shuttle valve (7) .
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Illustration 7 | g01244117 |
- Repeat Step 10 for shuttle valve (9). Refer to Illustration 1.
- Remove backup rings (38), O-ring seals (39), and O-ring seal (40) from boom interlock valve (8) .
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Illustration 8 | g01244118 |
- Repeat Step 12 for hook interlock valve (10). Refer to Illustration 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.
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Illustration 9 | g01244120 |
- Remove backup rings (46), O-ring seals (47), and O-ring seal (48) from boom brake release valve (41) .
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Illustration 10 | g01244121 |
- Repeat Step 15 for hook brake release valve (42). Refer to Illustration 9.
- Remove backup ring (49), O-ring seal (50), and O-ring seal (51) from check valve (43) .
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Illustration 11 | g01244122 |
- 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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Illustration 12 | g01244123 |
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