Komatsu PC20R-8 Shop Manual page 250

REMOVAL AND INSTALLATION
6 - For the boom cylinders.
Mount the brake bushing (19).
H For the boom cylinder for the PC20R-8, also
mount the spacer (20).
H Carefully check the orientation of the chamfer on
the brake bushing.
H For the PC27R-8 bucket cylinder and PC20R-8/
PC27R-8 blade cylinder: mount only the spacer
(21).
7 - Mount the complete piston (6).
8 - Mount the nut (5) that secures the piston and tighten
it with the socket wrench C6 and the dynamometric
tool with a multiplier C2.
Nut: Loctite 262
Nut:
Cylinder
Boom Arm
Model
PC20R-8 618w62 785w78
PC27R-8 785w78 785w78
4. Cylinder assembly
1 - Mount the tools C4 onto the apparatus C1.
2 - Position the bushing (22) and mount it onto the cylin-
der (2).
H Leave the cylinder in position, ready for the next
assembly operation.
30-68
Unit: mm
Boom
Bucket Blade
swing
412w41 539w54 618w62
618w62 912w91 618w62
WORK EQUIPMENT CYLINDERS
19 20 6
Bevel
Smusso
6
5
6
C
2
22
21
RKP06300
RKPA1500
2
C
RKPA1431
4
C
1
C
RKPA1391
PC20R-8 PC27R-8