Workshop Manual

UPPERSTRUCTURE / Control Valve
W2-5-35
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).
: 36 mm
: 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).
: 41 mm
: 100 N⋅m (10 kgf⋅m, 74 lbf⋅ft)
NOTE: Tighten the hexagonal part of 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).
: 46 mm
: 180 N⋅m (18.3 kgf⋅m, 133 lbf⋅ft)