Hitachi ZAXIS 450LC-3, Operator'S Manual

Page: 407 / 477

MAINTENANCE
7-137
Check O-rings in Bucket Joints --- daily
O-rings (1) are provided on both ends of the bucket joint
pins as illustrated to the right, to prevent soil from entering
the bucket joints and retain the grease in the bucket joints.
Thereby, wear on the bucket joint parts such as the pins and
the arm tip can be reduced. Check O-rings (1) for cracks or
any damage. If any, replace O-ring (1) while referring to the
separation type O-ring installation method described below.
(There are two kind of O-ring type.)
Type A (Separation Type O-ring) Installation Method
1. Install O-ring (1) in the direction as illustrated to the right
so that the separation section of O-ring (1) does not
directly come in contact with soil to protect O-ring (1)
from being damaged quickly by soil or foreign matter.
2. Install O-ring (1) with care not to make a gap in the
separation section of O-ring (1).
3. After installing O-ring (1), cut off the bolt extended from
the nut so that O-ring (1) is not damaged by soil which
may come in contact with the bolt.
Type B (Unit Type O-ring: ZX450LC-3 only) Installation
Method
Slide O-rings (2) out of the way, as shown
M1JB-07-049
M1J1-07-074
M104-07-063
1
1
1
1
Cut off the bolt
extended from
the nut.
1
Type A
Separation
Section
2
Bucket
Boss
O-Ring Shift
Type B
17