JLG X23J - X700AJ Service Manual - Manual (Page 135)

SECTION 3 - CHASSIS & TURNTABLE
3-108 – JLG Lift – 3121448
DETERMINATION OF FLATNESS DEVIATION,
AND PERPENDICULARITY DEVIATION AND
DEFORMATION OF THE MOUNTING
STRUCTURE
IMPORTANT
IF THERE ARE IMPERMISSIBLY HIGH DEVIATIONS
IN FLATNESS A ND PER PEND ICU LARITY I N THE
MOUNTING STRUCTURE, THEN ROTATIONAL RESIS-
TANCE OF THE SLEW DRIVE MAY SIGNIFICANTLY
INCREASE AND DAMAGE THE ENTIRE SLEW DRIVE.
IN THE WORST CASE THE SLEW DRIVE MAY BLOCK.
IF THE PERMISSIBLE VALUES FOR FLATNESS OR
PERPENDICULARITY DEVIATION ARE EXCEEDED,
THE MOUNTING STRUCTURE OF THE SLEW DRIVE
SHALL BE REPLACED OR REWORKED.
Determination of flatness deviation, and perpendicu-
larity deviation of the mounting structure
The mounting structure can be measured using a measur-
ing plate and dial gauges.
Laser processes and measuring with 3D systems have
also proven to be effective. These systems can be used
without additional auxiliary material, and they can docu-
ment the actual gradient of the mounting structure and
process it accordingly.
Flatness deviation
Figure 3-187. Flatness deviation