Disassembly And Assembly Of Control Valve Assembly - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02639-02
Disassembly and assembly of
control valve assembly
a This section deals with only precautions to be
followed when reassembling the control valve
assembly.
Assembly of control valve assembly
Coat the sliding surface with engine oil and
q
then reassemble the control valve assembly.
q Upper and lower control valve covers
2
Mating face of the upper and lower control
valve cover: Seal End 242 or equivalent
q Tighten the mounting bolts for the upper and
lower control covers in the sequence of A, D,
C, B below.
3
Mounting bolt for the upper and lower control
valve covers:
156.9 – 176.5 Nm {16 – 18 kgm}
q The filter installed on the valve assembly
should be assembled in the direction shown in
the following figure.
10
q Pump merge-divider valve
2
Mating face of the merge-divider valve:
1
q Tighten the mounting bolts for the merge-
divider valve in the same sequence as that for
the control valve cover mounting bolts.
3
Merge-divider valve mounting bolt:
q Back pressure valve
3
Back pressure valve mounting bolt:
Tighten the mounting bolts for the boom Hi
q
check valve, quick return valve, lock valve and
arm plate in the same sequence as that for the
control valve cover mounting bolts.
3
Boom Hi check valve mounting bolt:
3
Mounting bolt for quick return valve, lock
valve and arm plate:
Main relief valve assembly
Assemble the main relief valve assembly with the
control valve and install them to the machine. Then,
test and adjust the main relief pressure. For details,
see Testing and adjusting, "Testing and adjusting oil
pressure in work equipment, swing, and travel cir-
cuit".
50 Disassembly and assembly
Seal End 242 or equivalent
156.9 – 176.5 Nm {16 – 18 kgm}
58.8 – 73.8 Nm {6 – 7.5 kgm}
58.8 – 73.8 Nm {6 – 7.5 kgm}
58.8 – 73.8 Nm {6 – 7.5 kgm}
PC300, 350-8