Komatsu Galeo PC800-8 Shop Manual page 1046

SEN01057-01
6) Assemble piston assembly (4) as follows.
i) When using rod and piston assembly
(4) again
a Wash thoroughly and remove all
metal particles and dirt.
a. Screw in piston assembly (4),
then use tool U6 to tighten piston
assembly so that position of
screw thread hole matches.
a Remove all burrs and flashes
b. Tighten screw (3).
2
3
58.9 – 73.6 Nm {6 – 7.5 kgm}
c. Caulk thread at 4 places with
punch.
ii) When using a new part for either or
both of rod (2) or piston assembly (4)
a For the rod with bottom cushion,
mark the cushion plug position
on the end face of the rod.
q
42
with a file.
Threaded part:
Thread tightener (Loc-
tite No. 262 or equiva-
lent)
Screw (3):
Applicable to arm cylinder
50 Disassembly and assembly
a. Screw in until piston assembly
(4) contacts end face of rod (2),
then use tool U6 (des cribed
above) to tighten.
3
294 ± 29.4 Nm {30 ± 3.0 kgm}
a After tightening the piston,
check that there is play in
plunger (5).
b. Machine one hole used to install
screw (3).
a Apply the drill to the V-groove
between piston assembly (4)
and threaded part of rod (2),
and make a hole horizontally.
a For the cylinder with bottom
cushion (arm cylinder), avoid
the cushion plug position
when machining.
Screw machining dimension
q
(mm)
Drill Bottom
Cylinder
diameter hole depth
Bucket 10.3
Boom
10.3
Arm
Piston assembly (4):
Tap
Tap used
depth
36 12 × 1.75 29
43 12 × 1.75 36
PC800, 850-8