Komatsu PC200-8M0, Shop Manual, Page: 1092 / 1254

SEN06146-00
50-500
18
PC200, 200LC, 220, 220LC-8M0
500 Hydraulic system
Disassembly and assembly of control valve
q
Upper and lower control valve covers
2 Mating face of upper and lower control
valve cover blocks (11):
Loctite 222 or equivalent
a
Tighten the mounting bolts of the control
valve upper and bottom cover blocks in
the following order. (A
→
D
→
C
→
B)
3 Mounting bolts for control valve upper
and lower cover blocks:
156.9 – 176.5 Nm {16 – 18 kgm}
q Merge-divider valve
2 Merge-divider valve mating face (12):
Loctite 222 or Sealend 242 equivalent
a
Tighten the mounting bolts of merge-
divider valve in the same order as that for
the control valve cover block.
3 Merge-divider valve mounting bolt:
156.9 – 176.5 Nm {16 – 18 kgm}
q Variable back pressure valve
a
Tighten the mounting bolts of the variable
back pressure valve in the same order as
that for the control valve cover block.
3 Variable back pressure valve mounting
bolt:
58.8 – 73.6 Nm {6 – 7.5 kgm}
q Boom drift prevention valve
a
Tighten the mounting bolts of the boom
hydraulic drift prevention valve in the
same order as that for the control valve
cover block.
3 Mounting bolt of boom hydraulic drift
prevention valve:
58.8 – 73.6 Nm {6 – 7.5 kgm}
q Arm quick return valve
a
Tighten the mounting bolts of the arm
quick return valve in the same order as
that for the control valve cover block.
3 Mounting bolt of arm quick return valve:
58.8 – 73.6 Nm {6 – 7.5 kgm}
q
Arm drift prevention valve
a
Tighten the mounting bolts of the arm
hydraulic drift prevention valve in the
same order as that for the control valve
cover block.
3 Mounting bolt of arm hydraulic drift pre-
vention valve:
58.8 – 73.6 Nm {6 – 7.5 kgm}
a
After assembling, put stoppers to prevent
cleaning solvent from entering through
f
12
holes (13).
q
Pressure compensation valve
a
Install each pressure compensation valve
paying attention to the matchmark that
was put when removing it.
3 Pressure compensation valve:
372.7 – 411.9 Nm {38 – 42 kgm}
q
Main relief valve assembly
a
After installing to the control valve, check
and adjust them. For details, see Testing
and adjusting, "Measuring and adjusting
oil pressure in work equipment, swing,
and travel circuits".
3 Main relief valve assembly:
49 – 58.8 Nm {5 – 6 kgm}