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SEN00788-02
Testing and adjusting, Part 2
Inspection of swing circle
bearing clearance
a Inspection Device of Swing Circle Bearing
Clearance
Symbol
Part Number
N
Purchased
a When measuring swing circle bearing clearance
on a machine, follow the procedures below:
a For the standard values, see Structure, function
and maintenance standard, "Swing circle".
1. Fix the dial gauge N to the track frame (center
frame) and bring the stylus to the outer race end
face.
a Set the dial gauge to the front or to the rear.
2. Set the work equipment to the maximum reach
and set the bucket tip to the height of the revolv-
ing frame lower face.
a At the time, the front of the upper structure
lowers and its rear rises.
2
Part Name
Dial gauge
(with magnet)
3. Set the dial gauge N to the zero point.
4. Arrange the arm almost at right angles to the
ground and lower the boom until the front leg of
the machine body rises.
a At the time, the front of the upper structure
rises and its rear lowers.
5. At the time, read the value on the dial gauge N.
This value on the dial gauge indicates the swing
circle bearing clearance.
k During the measurement, never place
hands and legs below the undercarriage.
6. Return the work equipment to the state in Para-
graph 2 and make sure that the dial gauge N
has returned to the zero point. If not, repeat
Steps 2 to 5.
30 Testing and adjusting
PC800, 850-8
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