Testing swing circle bearing
clearance 1
a Testing tools for swing circle bearing clearance
a When testing the swing circle bearing clear-
ance installed to the machine, perform the fol-
lowing procedure.
k Stop the machine on a level ground and
lower the work equipment to the ground.
k Do not put your hands or feet under the
undercarriage during test.
1. Fix dial gauge H to the track frame and apply
the probe to the lower end of the outer race.
2. Set the work equipment to the maximum reach
position and set the bucket tip to the height of
the under side of the revolving frame.
a At this time the front of the upper structure
lowers and the rear rises.
3. Set dial gauge H to the 0 point.
4. Set the arm almost perpendicular to the
ground and lower the boom until the front track
shoe floats.
a At this time the front of the upper structure
rises and the rear lowers.
5. Under this condition, read dial gauge H.
a The value indicated by dial gauge H is the
clearance of the bearing.
a For the standard value, see Structure,
function and maintenance standard,
"Swing circle".
6. Return the machine to the condition of step 2
and check that dial gauge H indicates 0.
a If the dial gauge does not indicate 0,
repeat steps 2 through 5.
Symbol Part No. Part name
H
Commercially
available
Dial gauge
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