Komatsu PC210-8 Shop Manual page 1103

50 Disassembly and assembly
2] Tighten screw (3).
2
Screw part female screw side:
3
Screw:
58.9 – 73.6 Nm {6 – 7.5 kgm}
3] Caulk thread at four places (a) of
screw (3) with punch.
• When using a new part for either or
both of piston rod assembly (2)
and piston assembly (4)
a For the rod with bottom cushion, mark
the cap position on the end surface of
rod. (See step 3.5.)
Arm cylinder only
q
1] Screw in until piston assembly
(4) contacts end surface (B) of
rod, then use tool to tighten.
3
294 ± 29.4 Nm {30 ± 3.0 kgm}
a After tightening the piston, check that
there is play in plunger (5).
Boom, arm cylinder only
q
PC210, 230, 240-8
Loctite No.262
Piston assembly:
2] Machine one of the hole used to install
screw (3).
a Align a drill horizontal with the V-
groove of the thread of piston rod
assembly (2) and piston assembly (4),
then carry out machining.
a For the arm cylinder, avoid the cap
m a c h i n i n g h o l e s p o s i t i o n w h e n
machining. (See step 3.5.)
Screw machining dimension (mm)
q
Bottom hole Bottom
drill diameter hole depth
10.3 24
3] After machining, wash thoroughly to
remove all metal particles and dust.
4] Tighten screw (3).
2
Screw part female screw side:
3
Screw:
58.9 – 73.6 Nm {6 – 7.5 kgm}
5] Caulk thread at four places (a) of
screw (3) with punch.
7) Set piston rod assembly (2) in tool U1.
UEN00663-02
Tap used Tap depth
12x1.75 20
Loctite No.262
29