Test 017: Testing Swing Bearing - jcb JS300 Service Manual

Checking Swing Bearing Backlash
Set bucket 1mtr (40 in) above ground with dipper fully
extended.
Attach dial test indicator to lower half of Swing bearing and
set needle to bolt head on top half of Swing bearing.
Stop the machine. By hand push bucket fully to one side
and hold whilst dial test indicator is set to zero.
By hand push bucket fully to other side and record
measurement on dial test indicator.
Alternatively
Set bucket 1mtr (40 in) above ground with dipper fully
extended, stop machine.
By hand push bucket fully to one side and hold whilst a
mark is made across the two halves of Swing bearing.
By hand push bucket fully to other side and hold, make a
further mark on bottom half of bearing (which is in line with
original mark on top half of bearing).
E-270

Test 017: Testing Swing Bearing

Fig 20.
9813/5100-1
Section E - Hydraulics
Hydraulic System Fault Finding
Test 017: Testing Swing Bearing
record measurement and check against limits below.
Swing Backlash Limits
New Machine
6mm (0.24 in)
Limit of Use
12mm (0.48 in)
E-270