Komatsu PC200-8M0 Shop Manual page 1092

SEN06146-00
Upper and lower control valve covers
q
2
Mating face of upper and lower control
valve cover blocks (11):
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}
Variable back pressure valve
q
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}
Arm quick return valve
q
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}
18
50-500
Loctite 222 or equivalent
Disassembly and assembly of control valve
Arm drift prevention valve
q
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 f12
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}
Main relief valve assembly
q
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:
PC200, 200LC, 220, 220LC-8M0
500 Hydraulic system
49 – 58.8 Nm {5 – 6 kgm}