UPPERSTRUCTURE / Control Valve Disassemble Control Valve (4-Spool Housing Side) Disassemble Bypass Shut-Out Valve 1. Remove cap (31) from housing (38). Disassemble Boom Anti-Drift Valve 11. Remove socket bolts (10) (4 used). Remove cover (16) and O-rings (8) (4 used), (20) from housing (38). : 46 mm 2. Remove spool (33) and spring (34) from housing (38). Disassemble Arm Flow Rate Control Valve 3. Remove socket bolts (10) (4 used). Remove cover (45) and O-rings (8, 46) from housing (38). : 12 mm 12. Remove spring (21) and poppet (22) from housing (38). 13. Remove cap (1), spring (3) and poppet (4) from cover (16). : 12 mm 4.
Remove piston (47), spring (48), check valve (49) and poppet (53) from housing (38). 5. Remove cap (44), spring (51), guide (41) and spool (52) from cover (45). : 8 mm 14. Remove cap (13) and piston (11) from cover (16). NOTE: When replacing O-ring (14), remove cap (15) from cap (13). 15. Insert the pipe (inner dia.: 7 mm, outer dia.: 10 mm, length: 15 mm) into the hole on cap (13). Tap and remove sleeve (7) through the hole on cap (1). 16. Remove cap (19), spring (18) and check valve (17) from cover (16). : 30 mm : 30 mm 6. Remove cap (19), spring (39) and check valve (17) from cover (45). : 5 mm Disassemble Boom Flow Rate Control Valve 7. Remove socket bolts (10) (4 used).
Remove cover (45) and O-rings (8, 46) from housing (38). : 5 mm : 12 mm 8. Remove piston (47), spring (48), check valve (49) and poppet (50) from housing (38). 9. Remove cap (44), spring (42), guide (41) and spool (40) from cover (45). : 30 mm 10. Remove cap (19), spring (39) and check valve (17) from cover (45). : 5 mm W2-5-7