Hitachi ZX200-5G Workshop Manual page 260

Disassembly of Control Valve (4-Spool Side)
 Disassembly of Spool
1. Remove socket bolts (63) (6 used). Remove cap (62),
O-rings (59) (4 used), and O-rings (4, 13, 14) from
housing (1).
l : 8 mm
IMPORTANT: Do not disassemble the spool (54)
assembly unless necessary.
2. Put the matching marks on the spool (37, 47, 50, 51,
54) assemblies and housing (1). Remove the spool
(37, 47, 50, 51, 54) assemblies and spring (58) from
housing (1).
 Disassembly of Boom Anti-Drift Valve (Selector Valve)
3. Remove plug (36) and O-ring (35) from body (32).
j : 38 mm
4. Remove socket bolts (6) (3 used). Remove the body
(32) assembly, O-rings (13) (5 used), and O-ring (31)
from housing (1).
l : 8 mm
5. Remove piston (34) and spring (33) from body (32).
6. Remove the sleeve (29) assembly, seat (22), and
spring (21) from housing (1). Remove backup rings
(24, 28), O-rings (25, 26), poppet (23), and spool (30)
from sleeve (29).
SECTION 3 UPPERSTRUCTURE
Group 9 Control Valve
W3-9-3-4
 Disassembly of Overload Relief Valve (20)
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 valves (20) (2 used) and
O-rings (19) (2 used) from housing (1).
j : 32 mm
 Disassembly of Check Valve
8. Remove plug (8), O-ring (7), spring (12), and poppet
(11) from housing (1).
l : 10 mm
9. Remove socket bolts (6) (2 used). Remove flange (5),
O-ring (4), spring (3), and poppet (2) from housing
(1).
l : 8 mm
10. Remove socket bolts (6) (2 used).
Remove flange (16), O-ring (4), spring (3), and
poppet (15) from housing (1).
l : 8 mm
11. Remove plugs (8) (2 used) and O-rings (7) (2 used)
from housing (1).
l : 10 mm
12. Remove plugs (10) (2 used) and O-rings (9) (2 used)
from housing (1).
l : 6 mm