UPPERSTRUCTURE / Control Valve Disassemble Control Valve 4-Spool Side Disassemble Spool 1. Remove socket bolts (63) (6 used). Remove cap (62), O-rings (59) (4 used) and (4) from housing (1). Disassemble Overload Relief Valve (20) IMPORTANT: Do not disassemble the overload relief valve. If the overload relief valve is disassembled, pressure must be adjusted. (Refer to the Operational Performance Test section / TROUBLESHOOTING in the separated volume, T/M.) 7. Remove overload relief valves (20) (2 used) from housing (1). : 8 mm 2. Put the matching marks on the spool (37, 47, 50, 51, 54) assemblies and housing (1).
Remove the spool (37, 47, 50, 51) assemblies, spring (58) and the spool (54) assembly from housing (1). NOTE: Do not disassemble the spool (54) assembly unless necessary. : 32 mm Disassemble Check valve 8. Remove plug (8), spring (12) and poppet (11) from housing (1). Disassemble Boom Anti-Drift Valve 3. Remove plug (36) from body (32). : 6 mm 9. Remove socket bolts (6) (2 used). Remove flange (5), O-ring (4), spring (3) and poppet (2) from housing (1). : 38 mm 4. Remove socket bolts (6) (3 used). Remove the body (32) assembly, O-rings (13) (4 used) and (31) from housing (1). : 8 mm 10. Remove socket bolts (6) (2 used).
Remove flange (16), O-ring (4), spring (3) and poppet (15) from housing (1). : 8 mm 5. Remove piston (34) and spring (33) from body (32). 6. Remove the spool (29) assembly, seat (22) and spring (21) from housing (1). Remove backup rings (24, 28), O-rings (25, 26), poppet (23) and spool (30) from sleeve (29). : 8 mm 11. Remove plugs (8) (2 used) and (10) (2 used) from housing (1). : 6 mm, 10 mm W2-5-9