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July 2007
REV A
D-6
Inspect for Turntable Bearing
Wear
Note: Genie requires that this procedure be
performed every 1000 hours or annually,
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.
1 Grease the turntable bearing. See A-10, Grease
the Turntable Bearing and Rotate Gear.
2 Torque the turntable bearing bolts to
specification. See D-5, Check the Turntable
Rotation Bearing Bolts.
3 Raise the primary and secondary booms to full
height using the ground controls. Do not extend
the primary boom.
Part No. 128267
Section 3 • Scheduled Maintenance Procedures
4 Place a dial indicator between the drive chassis
and the turntable at a point that is directly
under, or in line with, the boom and no more
than 1 inch / 2.5 cm from the bearing.
Note: To obtain an accurate measurement, place
the dial indicator no more than 1 inch / 2.5 cm from
the turntable rotation bearing.
a
b
c
d
5 Adjust the dial indicator to "0".
6 Lower the secondary boom to the stowed
position and lower the primary boom to a
horizontal position. Fully extend the primary
boom.
7 Note the reading on the dial indicator.
Result: The measurement is less than
0.055 inch / 1.4 mm. The bearing is good.
Result: The measurement is more than
0.055 inch / 1.4 mm. The bearing is worn and
needs to be replaced.
Z-34/22 IC
CHECKLIST D PROCEDURES
a
turntable
b
dial indicator
c
drive chassis
d
turntable rotation bearing
3 - 43
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