UPPERSTRUCTURE / Control Valve Assemble Control Valve (4-Spool Housing Upper and Lower Surfaces) Assemble Overload Relief Valve IMPORTANT: Align the matching marks and tighten adjusting screw (3) to the same turns when disassembling. 1. Install pilot poppet (6), spring (5), adjusting screw (3) and lock nut (2) to seat (7). 2. Install O-ring (16), backup ring (17) and O-ring (18) to sleeve (15). 3. Install piston (13) to main poppet (14). Install main poppet (14) to sleeve (15). 4. Clamp sleeve (15) into a vise. Install springs (8, 12) to the seat (7) assembly. Install the seat (7) assembly to sleeve (15). Assemble Arm Regenerative Valve 6.
Install O-ring (28) and backup ring (27) to sleeve (29). Install piston (26) and sleeve (29) to sleeve (23). 7. Install spool (25), spring (22) and spring plate (21) to sleeve (23). IMPORTANT: Cap (19) is pushed outside by spring (22). While pushing cap (19) to sleeve (23), install cap (19). 8. Install O-ring (20) to cap (19). Clamp sleeve (23) into a vise. Install cap (19) to sleeve (23). : 14 mm : 180 N m (18.3 kgf m, 133 lbf ft) 9. Install O-ring (24) to sleeve (23). Install sleeve (23) to housing (1). : 100 N m (10 kgf m, 74 lbf ft) IMPORTANT: Install the overload relief valve to the original position before disassembling.
Adjust pressure of the overload relief valve by using a test bench. (Refer to the Operational Performance Test section / TROUBLESHOOTING in the separated volume, T/M.) 5. Install the overload relief valves (4 used) to housing (1). : 36 mm : 46 mm : 180 N m (18.3 kgf m, 133 lbf ft) : 41 mm : 100 N m (10 kgf m, 74 lbf ft) NOTE: Tighten the hexagonal part of sleeve (15). W2-5-35