UPPERSTRUCTURE / Control Valve Disassemble Control Valve (4-Spool Housing Upper and Lower Surfaces) Disassemble Overload Relief Valve IMPORTANT: Do not disassemble the overload relief valve. When the overload relief valve is disassembled, pressure must be adjusted. 1. Remove the sleeve (15) assembly (2 to 18) from housing (1). Disassemble Bucket Regenerative Valve 8. Remove the sleeve (31) assembly (19 to 37) from housing (1). : 36 mm 9. Clamp sleeve (31) into a vise. Remove cap (19). : 41mm 2. Clamp sleeve (15) into a vise. Remove the seat assembly (2 to 7, 9, 10) from sleeve (15). Remove springs (8, 12), piston (13) and poppet (14) from sleeve (15). : 14 mm NOTE:
Cap (19) is pushed outside by spring (30). While pushing cap (19) to sleeve (31), remove cap (19). 10. Remove spring seat (21), spring (30) and spool (25) from sleeve (31). 11. Remove sleeve (33) from housing (1) by using special tool (ST 1489). Remove piston (26) from sleeve (33). 12. Remove check valve (37) and spring (36) from sleeve (33). Disassemble Check Valve-1 13. Remove cap (56), check valve (37) and spring (36) from housing (1). : 36 mm IMPORTANT: Put the matching marks on adjusting screw (3) and seat (7). Record the rotation number of adjusting screw (3). 3. Loosen lock nut (2). Remove adjusting screw (3), spring (5) and pilot poppet (6) from seat (7). :
6 mm, 10 mm Disassemble Arm Regenerative Valve 4. Remove the sleeve (23) assembly (19 to 29) from housing (1). : 19 mm : 14 mm : 46 mm 5. Clamp sleeve (23) into a vise. Remove cap (19). : 14 mm NOTE: Cap (19) is pushed outside by spring (22). While pushing cap (19) to sleeve (23), remove cap (19). 6. Remove spring seat (21), spring (22) and spool (25) from sleeve (23). 7. Remove sleeve (29) and piston (26) from sleeve (23). W2-5-29