Komatsu ecot3 PC300LC-8 Shop Manual page 975

50 Disassembly and assembly
2] Machine one of the holes used to
install screw (3).
a Using a drill, level off V-groove
between piston (4) and rod (3).
a Machining of the cylinder with bottom
cushion (arm cylinder) must not be
done at the cushion plug position.
Screw machining dimension (mm)
q
Prepared
hole drilling
diameter
10.3
3] After machining, wash thoroughly to
eliminate metal particles and dust.
4] Tighten screw (3).
3
Screw:
58.9 – 73.6 Nm {6 – 7.5 kgm}
5] Caulk thread at 4 places using a
punch.
PC300, 350-8
Depth of
Tapping
prepared Tap used
depth
hole
27 12 x 1.75
7) Assemble piston rod assembly (2).
a Set the ring end gap (C) horizontally
a After inserting, make sure that the
20
8) Tighten head assembly (1) with mounting
bolts.
3
Cylinder
name
Bucket
Boom
9) Install piping.
(sideways), and then insert it aligning
the axial center of cylinder tube.
ring is not broken and is present in its
place. Then push in the assembly
fully.
Mounting bolt:
Tightening torque
373 ± 54 Nm
{38.0 ± 5.5 kgm}
Arm 490 ± 49 Nm {50.0 ± 5.0 kg}
373 ± 54 Nm {38.0 ± 5.5 kgm}
SEN02639-02
23