UPPERSTRUCTURE / Control Valve Disassemble Control Valve (5-Spool Housing Upper and Lower Surfaces) Disassemble Overload Relief Valve-1 IMPORTANT: Do not disassemble the overload relief valve. When the overload relief valve is disassembled, pressure must be adjusted.(Refer to the Operational Performance Test section / TROUBLESHOOTING in the separated volume, T/M.) Attach the identification tag onto the overload relief valves (4 used) in order to install to the original position. 1. Loosen sleeve (57). Remove overload relief valves-1 from housing (64). 6. When replacing O-ring (58), remove cap (59) from housing (64). 7. When replacing O-ring (45), remove cap (44) from housing (64). : 41 mm 2.
Clamp the hexagonal part of sleeve (57) into a vise. Loosen the hexagonal part of seat (53). Remove the seat assembly (46 to 50, 52, 23, 24). Remove springs (51, 54), piston (55) and poppet (56) from sleeve (57). : 36 mm IMPORTANT: Put the matching marks on adjusting screw (47) and seat (53). Record the rotation number of adjusting screw (47). 3. Remove lock nut (46). Remove adjusting screw (47), spring (49) and pilot poppet (50) from seat (53). : 6 mm Disassemble Check Valve-1, Check Valve-2 4. Remove caps (31, 36), check valve (35) and spring (34) from housing (64). : 19 mm : 14 mm Disassemble Check Valve-3 5.
Remove cap (38), spacer (40), spring (42) and check valve (43) from housing (64). : 8 mm W2-5-43