Disassembly And Assembly Of Work Equipment Ppc Valve Assembly - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02639-02

Disassembly and assembly of work equipment PPC valve assembly

a Only precautions for assembling the work
equipment PPC valve assembly are explained
below.
Disassembly
a Spring (6) and spring (7) consist 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.
14
50 Disassembly and assembly
Assembly
a The head of plug (2) must not be projected
from the body (1) surface.
3
Plug (2): 6 – 11 Nm {0.6 – 1.1 kgm}
a When installing plug (3) to body (1), check the
insertion depth so that the tip of plug does not
enter the inside Ø20 hole of the body.
3
Plug (3): 4 – 9 Nm {0.4 – 0.9 kgm}
a Install spring (5) with its small diameter side on
the shim (4) side.
Diameter of spring (Inside diameter)
q
Small diameter side: Ø4.9 mm
Large diameter side: Ø5.55 mm
a When installing springs (6) and (7), note that
they are different and they must be installed to
different hydraulic ports.
q Installed height: 31.8 mm (Common to
both springs)
Installed load:
q
Spring (6) (P1, P2): 35.3 N {3.6 kg}
Spring (7) (P3, P4): 21.6 N {2.2 kg}
a When installing piston (8), apply grease (G2-
LI) to its outside and the inside of the body (1)
hole.
3
Bolt (11):
11.8 – 14.7 Nm {1.2 – 1.5 kgm}
1
PC300, 350-8