April 2018 Maintenance Manual
Annual Maintenance Procedures
Part No. 1268489GT S
®
Booms • Z
®
Booms 105
A-5
Perform Maintenance –
Jib Rotate Bearing - SX-150 and
SX-180
Jib rotate bearing specifications require that these
procedures be performed annually.
Periodic inspection of jib bearing wear is essential
to safe machine operation, good machine
performance and service life. Continued use of a
worn jib bearing could create an unsafe operating
condition, resulting in death or serious injury and
component damage.
Note: Perform this procedure with the boom fully
retracted and in the stowed position and with the
machine on a firm, level surface.
Check the Jib Rotator Fastener torque
1 Using a star pattern, confirm that each jib
rotator outer mounting bolt is torqued in
sequence to specification.
2 Repeat the procedure for the inner mounting
bolts.
Jib boom rotate bearing bolts
200 ft-
Grease the Jib Rotator
3 While rotating the jib, pump grease into each
bearing lubricating grease fitting until fresh
grease is visible at the outer seal.
4 While rotating the jib, pump grease into the
worm gear grease fitting until fresh grease is
visible at one sealing lip or bearing cap.
Illustration 1
1 bearing lubrication fitting
2 worm gear lubrication fitting
3 sealing lip
Jib Rotator Bearing Wear
5 Place a 750 lb / 340 kg weight in the platform
and raise the jib until it is horizontal and
parallel with the boom.
6 Place the dial indicator on the side of the
rotator bearing housing and measure the
bearing as shown in illustration 2.
7 Using a forklift, raise the platform and jib
components so there is no weight on the
rotator bearing.
8 Adjust the dial indicator needle to the "zero"
position..
9 Lower the forklift, allowing the platform and jib
assembly to settle.
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