Disassembly And Assembly Of Work Equipment Ppc Valve Assembly - Komatsu PC88MR-10 Shop Manual

Disassembly and assembly of work equipment PPC valve
assembly
(PC88MR-PL28-926-K-00-A)
a This section explains only the precautions for disassembling and assembling the work equipment PPC
valve.
Disassembly
(PC88MR-PL28-530-K-00-A)
a 2 each of 2 different types of springs with
different mounting load are installed to springs
(6) and (7). Check the mounting position
(hydraulic port) to prevent any wrong installation.
Assembly
(PC88MR-PL28-710-K-00-A)
a Carefully clean and inspect the parts to prevent
failure due to dust, rust, and scratch, etc., and
then take extreme care when assembling them.
a Plugs (2) and (3) are not supplied.
a When assembling piston (8), apply grease (G2-
L1) to the piston periphery and inner periphery of
body (1) hole.
a When installing spring (5), install the end surface
of the smaller end turn diameter to shim (4) side.
End turn diameter of spring (inside diameter)
Small diameter side: 4.9 mm, large diameter
side: 5.55 mm
a As springs (6) and (7), different springs are used
for hydraulic ports. Check it before installing.
Installed height: 32 mm (all)
PC88MR-10
50 Disassembly and assembly
Load at installed height
Spring (6) (P1, P2): {2.22 kg}
Spring (7) (P3, P4): {1.42kg}
Bolt (11):
11.8 to 14.7 Nm {1.2 to 1.5 kgm}
a When installing joint (12) to body (1), apply
Loctite according to the following procedure.
1. When installing the joint, apply 1 drop
(approximately 0.02g) of Loctite (No.648) to the
female threaded part (A) (2 places) of the body.
Before installing, thoroughly degrease and dry
the male threaded part of the joint and the
female threaded part of the body by using
Drysol.
2. The positions where a drop of Loctite is applied
are as follows.
Hydraulic system
50-155