Hitachi EX20UR-2 Manual page 259

11. Operate the crane to slightly raise the boom. Move
the machine in reverse to separate it away from the
boom. Lower the boom to the ground and lay it on
its side.
9. Disconnect all front attachment hoses (1).
19 mm, 22 mm
W562-02-05-002
10. Loosen nut (3) to remove boom-foot pin securing
bolt (2). Remove boom-foot pin (1).
*N=G:
EX3OUR: 17mm
EX4OUR: 19mm
W562-04-01-002
W554-04-01-001
FRONT ATTACHMENT/ Front Attachment
8. Loosen bolts (2) (6 used) (7 used for EX4OUR-2) to
remove center joint upperside cover (1).
INNING:
10 mm, 13 mm, 17 mm
W562-02-05-001
W04-01-03