Measuring Clearance Of Swing Circle Bearing - Komatsu PC130-7 Shop Manual

TESTING AND ADJUSTING
MEASURING CLEARANCE OF
SWING CIRCLE BEARING
a Measuring instrument for clearance of swing cir-
cle bearing
Symbol Part No.
Commercially
G
available
a When measuring the clearance of the swing cir-
cle bearing on the actual machine, observe the
following procedure.
k While measuring, do not put your hands or foot
under the undercarriage.
1. Fix dial gauge G to outer race (1) or inner race
(2) of the swing circle and apply the probe to the
end face of inner race (2) or outer race (1) on the
opposite side.
a Set dial gauge G on the front or at rear side
of the machine
2. Set the work equipment in the maximum reach
posture and set the bucket tip to the height of the
revolving frame bottom.
a At this time, the front end of the upper struc-
ture lowers and the rear end rises.
3. Set the dial gauge G to the 0 point.
PC130-7

MEASURING CLEARANCE OF SWING CIRCLE BEARING

Part name
Dial gauge
4. Set the arm at almost a right angle to the ground
and lower the boom until the track shoe at the
front side of the machine is floated.
a At this time, the front end of the upper struc-
ture rises and the rear end lowers.
5. Under this condition, read dial gauge G.
a Dial gauge G indicates the clearance of the
bearing.
6. Return the machine to the posture of step 2 and
check that dial gauge G indicates 0 again.
a If dial gauge G does not indicate 0, repeat
steps 3 – 5.
7. After finishing measurement, remove the mea-
suring instruments and return the removed parts.
20-119
(1)