Hitachi ZX200-5G Workshop Manual page 278

Disassembly of Control Valve (5-Spool Side)
 Disassembly of Spool
1. Remove socket bolts (52) (6 used). Remove cap
(55), O-rings (51) (5 used), and O-rings (20, 21) from
housing (1).
l : 8 mm
2. Put the matching marks on spools (41, 45, 46, 47,
50) and housing (1). Remove the spool (41, 45, 46,
47, 50) assemblies from housing (1).
 Disassembly of Arm Anti-Drift Valve
3. Remove plug (36) and O-ring (35) from body (32).
j : 38 mm
4. Remove socket bolts (8) (3 used). Remove the body
(32) assembly, O-rings (31), and O-rings (20) (5 used)
from housing (1).
l : 8 mm
5. Remove piston (34) and spring (33) from body (32).
6. Remove spool (30), sleeve (29), poppet (24), seat
(23), and spring (22) from housing (1).
Remove backup rings (25, 28) and O-rings (26, 27)
from sleeve (29).
SECTION 3 UPPERSTRUCTURE
Group 9 Control Valve
W3-9-4-4
 Disassembly of Overload Relief Valve (19)
IMPORTANT: Do not disassemble the overload
relief valve. If the overload relief valve has been
disassembled, pressure should be adjusted. (Refer
to TROUBLESHOOTING / Operational Performance
Test in the separated volume, T/M.)
7. Remove overload relief valve (19) and O-ring (18)
from housing (1).
j : 32 mm
 Disassembly of Main Relief Valve (17)
IMPORTANT: Do not disassemble the main
relief valve. If the main relief valve has been
disassembled, pressure should be adjusted. (Refer
to TROUBLESHOOTING / Operational Performance
Test in the separated volume, T/M.)
8. Remove main relief valve (17) from housing (1).
j : 32 mm
 Disassembly of Load Check Valve (Arm Regenerative
Parallel Circuit)
9. Remove spacer (40), spring (38), and poppet (37)
from housing (1). Remove backup ring (28) and
O-ring (39) from spacer (40).
10. Remove socket bolts (8) (2 used). Remove flange (7),
O-ring (6), spring (5), and poppet (4) from housing
(1).
l : 8 mm
11. Remove socket bolts (8) (2 used). Remove flange
(7), O-ring (13), spring (12), and poppet (11) from
housing (1).
l : 8 mm