Komatsu PC20R-8 Shop Manual page 251

REMOVAL AND INSTALLATION
3 - Lubricate the threading and the first part of the cylin-
der (2).
Cylinder: ASL800050
4 - Mount the two halves of the tool C11, adapted to the
diameter, onto the mouthpiece of the cylinder (2).
5 - Mount the piston rod group (4) onto the tool C1 and
raise the mobile part up to the end of its stroke.
6 - Put the cylinder (2) into a vertical position and guide
the piston into the tool C11.
7 - Lower the apparatus supporting the piston rod (4) in
order to insert the piston into the cylinder liner (2).
8 - Remove the tool C11 from the cylinder and then lower
the apparatus C1 even further, until the head (3) and
the piston rod approach the cylinder.
9 - Place the cylinder (2) in position for screwing in the
head (3).
10 - Insert the head into the cylinder and screw it in by
hand for a few turns.
11 - Attach the special wrench C5 to the dynamometric
tool C2 and screw the head (3) fully home.
Head:
Cylinder
Boom Arm
Model
PC20R-8 490w49 490w49
PC27R-8
490w49 490w49
12 - Mount the guard rings (1) on both sides of the cylin-
der and the piston rod.
PC20R-8 PC27R-8
Unit: mm
Boom
Bucket Blade
swing
412w41 539w54 490w49
412w41 539w54 490w49
WORK EQUIPMENT CYLINDERS
6
4
2
5
C
3
2
11
C
RKPA1510
1
C
11
C
RKPA1421
2
C
RKPA1401
30-69