Disassembly And Assembly Of Work Equipment Ppc Valve Assembly - Komatsu PC130-8 Shop Manual

SEN04130-01

Disassembly and assembly of work equipment PPC valve assembly

(For boom, bucket, arm, swing control)
In this section, only the precautions for disassem-
bling and assembling the work equipment PPC
valve assembly are discribed.
Disassembly
a Spring (6) and spring (7) consists of each one
of two types of springs with different installed
loads in four places, so check the mounting
position (oil pressure port) and mark with tags
to prevent mistakes when installing.
28
50 Disassembly and assembly
Assembly
a When assembling, clean and inspect the parts
closely and take care fully so that dirt, rust,
flaw, etc. will not cause a trouble.
a When installing plug (2) to body (1), take care
that its tip will not enter the hole of the body 20
mm in diameter.
3
Plug (2): 4 – 9 Nm {0.4 – 0.9 kgm}
a The head of plug (3) must not be projected
from the body (1) surface.
3
Plug (3): 6 – 11 Nm {0.6 – 1.1 kgm}
a When installing piston (8), apply grease (G2-
LI) to its outside and the inside of the body (1)
hole.
a Install spring (5) with its small diameter side on
the shim (4) side.
q Diameter of spring (Inside diameter)
Small diameter side: ø4.9, Large diameter
side: ø5.55
a When installing springs (6) and (7), note that
they are different and they must be installed to
different hydraulic ports.
1
PC130-8