Hitachi EX20UR-2 Manual page 160

Install Swing Bearing
Clean and apply sealant to the mounting surfaces of the
track frame and swing bearing.
1. Lift the swing bearing using a crane. Align the
marks on the track frame and swing bearing inner
race.
NOTE: If the marks are not aligned, the soft zone posi-
tion will be incorrect.
A° : EX2OUR-2 (12°51')
EX3OUR-2 (12°51')
EX4OUR-2 (9°)
W507-03-01-002
Front Side
'S" (the soft zone)
Marking Position
Plug Position
W507-03-01-003
2. Tighten swing bearing inner race mounting bolts (1)
(16 used) (20 used for EX4OUR-2).
iii: 19 mm
: 103 N•m ( 10.5 kgf-m, 76 lbf•ft )
W507-02-03-002
UNDERCARRIAGE / Swing Bearing
W03-01-02