Komatsu PC210-8 Shop Manual page 1097

50 Disassembly and assembly
Disassembly and assembly of
work equipment PPC valve
assembly
a This section deals with only precautions to be
followed when reassembling the PPC valve
assembly for work equipment.
Assembly
Work equipment PPC valve reassembly
q
a
When assembling spring (11), be sure to face
its smaller end turn (inner diameter) side
toward shim (12).
a
Springs (10) in use differ in the number of
turns according to hydraulic ports as classified
in the table below. Hence take care when
installing one.
Port position Spring free length
P1 and P2
P3 and P4
PC210, 230, 240-8
44.4 mm
42.4 mm
a The location of each port is stamped in the
lower part of the valve body.
2
Piston (8): Grease (G2-LI)
a When assembling piston (8), coat the piston
outer periphery and body hole inner periphery
with grease.
3
Mounting bolt for plate (5):
11.8 – 14.7Nm {1.2 – 1.5 kgm}
2
Joint (4) sliding portion.
2
Body female screw portion:
a Coat the female screw body with Loctite at two
spots as shown in the diagram below. Each
spot is to be coated with a drop (approx. 0.02g).
3
Joint (4): 39 – 49 Nm {4 – 5 kgm}
a Strictly follow the specified torque for the joint.
2
Contact surfaces of the piston and disc (2):
3
Nut (1): 98 – 127 Nm {10 – 13 kgm}
a After assembling the disc, refer to the Adjust-
ment of Work Equipment and Swing PPC Valve
section of the Testing and adjusting chapter of
this manual.
UEN00663-02
Grease 2 – 4 cc (G2-LI)
Adhesive compound (LT-2)
Grease 0.3 – 0.8 cc (G2-LI)
23