Genie ZX-135/70 Service Manual page 78

August 2014
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.
Note: To obtain an accurate measurement, place
the dial indicator no more than 1 inch / 2.5 cm from
the turntable rotation bearing.
4 turntable
5 dial indicator
6 drive chassis
7 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.
Part No. 218700
Checklist C Procedures
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.
8 Move the boom sections to the positions
indicated in step 3. Visually inspect the dial
indicator to be sure the needle returns to the
"zero" position.
9 Remove the dial indicator and rotate the
turntable 90°.
10 Repeat steps 4 through 9 until the rotation
bearing has been checked in at least four
equally spaced areas 90° apart.
11 Lower the boom to the stowed position and
turn the machine off.
12 Remove the dial indicator from the machine.
ZX-135/70
Service Manual
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