Daewoo Solar 225LC-V, Shop Manual

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S0407000
Page 3
Swing Bearing
SWING BEARING MAINTENANCE
OPERATING RECOMMENDATION
The service life of the swing bearing may be extended if a conscious, daily effort is made to equalize usage
over both ends of the excavator. If the excavator is used in the same operating configuration day in and
day out (for example, with the travel motors always under the counterweight, or with the attachment over
one side of the machine more than the other), the bearing’s service life could be reduced. Taking a few
minutes in the middle of each work shift to reposition the excavator, to work the opposite end of the
bearing, will provide a payoff in terms of more even, gradual rate of wear and extended service life.
MEASURING SWING BEARING AXIAL PLAY
Periodic, regular checks of bearing
displacement should be made at least twice a
year. Use a dial indicator. Push the attachment
against the ground to lift the excavator off the
ground and take measurements at 4 points, 90°
apart, around the circumference of the bearing
(Figure 1).
Record and keep all measurements. Play in the
bearing should increase minimally from one
inspection to the next. Eventually, however, as
the bearing begins to approach the limit of its
service life, clearance increases become much
more pronounced and the actual measured play
in the bearing could exceed twice the value that
was measured when the machine was new.
MEASURING BEARING LATERAL PLAY
When vertical checks are made, the side-to-side
play in the bearing can be checked by fully
retracting the arm and bucket cylinders and
extending the tip of the bucket as far forward as
it will go. With the excavator parked on a flat,
level surface and the bucket tip just off the
ground, push against the bucket sideways to
take up all of the lateral clearance in the
bearing. (Less than 100 lb of force should be
required to move the bucket over all the way.)
Check lateral play in both directions and record
the values. When the bearing is beginning to
approach the end of its service life, measured
lateral clearance should start to show larger and
larger increases.
Figure 1