Disassembly And Assembly Of Work Equipment Ppc Valve Assembly - Komatsu Galeo PC800-8 Shop Manual

50 Disassembly and assembly
Disassembly and assembly of
work equipment PPC valve
assembly
a In this section, only precautions for assembling
the work equipment PPC valve assembly are
explained.
PC800, 850-8
Assembly
Work equipment PPC valve assembly
q
a Install spring (8) with its small (inside) diameter
1
end on the shim (10) side.
a Springs (11) having different numbers of turns
are used for the following hydraulic ports. Take
care when installing them.
a Installed height (34 mm), Spring constant: 0.98
Nm {0.1 kg/mm}
(Common to P1, P2, P3, and P4)
Port
P1, P2
P3, P4
a The location of each port is stamped at the
lower part of the valve body.
2
Piston (7): Grease (G2-LI)
a When installing piston (7), apply grease to the
outside of the piston and inside of the body
hole.
3
Mounting bolt (3) of plates (5) and (6):
2
Sliding part of joint (4):
a Degrease the male threads of joint (4) and
female threads of body (12) thoroughly, and
then dry them.
2
Female threads of body:
a Apply 1 drop (about 0.02 g) of LOCTITE each
to 2 places of the female threads of the body
as shown in the figure.
3
Joint (4): 39 – 49 Nm {4 – 5 kgm}
a Observe the tightening torque for the joint.
SEN01057-01
Installed load
3.92 N {0.4 kg}
11.76 N {1.2 kg}
11.8 – 14.7 Nm {1.2 – 1.5 kgm}
Grease of 2 – 4 cc (G2-LI)
Adhesive (THREEBOND No. 648)
35