Komatsu ecot3 PC300-8, Shop Manual

Page: 373 / 1035

SEN02625-06
PC300, 350-8
33
30 Testing and adjusting
Testing clearance in swing circle
bearings
a
Swing circle bearing clearance measurement
tool
a
Follow the steps explained below when measur-
ing clearance in the swing circle bearing on the
actual machine.
k Be careful not to put a hand or foot under the
undercarriage, while taking measurement.
1. Fasten dial gauge J to swing circle outer race (1)
or inner race (2), and contact the probe against
the end surface of inner race (2) or outer race (1)
on the opposite side.
a
Set dial gauge J at the machine front or rear
side.
2. Keep the work equipment in the max. reach
posture and keep the height of the bucket teeth
tip level with the lower height of the revolving
frame.
a
The upper structure is lowered at the front
and raised at the rear at that time.
3. Set dial gauge to the zero point.
4. Hold the arm nearly perpendicular to the ground,
and lower the boom until the track shoes will be
lifted at the machine front.
a
The upper structure is raised at the front and
lowered at the rear at that time.
5. Read the value indicated by dial gauge J in this
condition.
a
The value indicated by dial gauge J repre-
sents the clearance in the bearings.
6. Return the machine to the posture in Item 2
above, and confirm dial gauge J reading returns
to zero.
a
If zero value is not indicated, repeat the steps
in Items 3 through 5.
Mark Part No. Part Name
J
Commercially
available
Dial gauge