Inspect For Turntable Bearing Wear - Terex Genie ZX-135/70 Service Manual

Service Manual
Checklist C Procedures
C-8
Inspect for Turntable Bearing
Wear
Genie requires that this procedure be performed
every 500 hours or six months, whichever comes
first.
Periodic inspection of turntable bearing wear is
essential to safe machine operation, good machine
performance and service life. Continued use of a
worn turntable 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.
1 Grease the turntable bearing. Refer to
Maintenance Procedure, Grease the
Turntable Bearing and Rotate Gear.
2 Torque the turntable bearing bolts to
specification. Refer to Maintenance
Procedure, Check the Turntable Rotation
Bearing Bolts.
3 Start the machine from the ground controls
and fully raise, but do not extend, the primary
boom and jib. The secondary riser should
remain in its stowed position.
4 Place a dial indicator between the drive
chassis and the turntable at a point that is
directly under, or inline with, the boom and no
more than 1 inch / 2.5 cm from the bearing.
66
Note: To obtain an accurate measurement, place
the dial indicator no more than 1 inch / 2.5 cm from
the turntable rotation bearing.
1 turntable
2 dial indicator
3 drive chassis
4 turntable rotation bearing
5 Adjust the dial indicator needle to the "zero"
position.
6 Raise the secondary riser, but do not extend it.
Move the primary boom and jib to horizontal
and fully extend.
7 Note the reading on the dial indicator.
Result: The measurement is less than
0.118 inch / 3.0 mm. The bearing is good.
Result: The measurement is more than
0.118 inch / 3.0 mm. The bearing is worn and
needs to be replaced.
ZX-135/70
September 2015
Part No. 218700