JLG X20JP - X600AJ Service Manual - Manual (Page 49)

SECTION 3 - CHASSIS & TURNTABLE
3121623 – JLG Lift – 3-25
TRANSPORTING UNPACKED SLEW DRIVES
Figure 3-30. Use suitable lifting gear/never transport
product vertically
Unpacked slew drives can be transported with lifting gear
when using eye bolts under the following conditions
• The lifting gear must be configured appropriately for
the weight of the transport units.
• The ring bolts must be configured appropriately for the
weight of the transport unit.
• The slew drive shall only be transported by itself, with-
out attached parts.
• Maintain the insertion depth prescribed by the manu-
facturer.
• If insertion depth is not prescribed, then a minimum
insertion depth of 1.5 x the bolt diameter must be
selected.
• Transport within the company shall only be executed
horizontally.
Figure 3-31. Always use the full length of the thread
Attachment:
1. Screw the 3 eye bolts into the 3 threads that are dis-
tributed uniformly on the circumference of the slew
drive.
SCREW IN THE EYE BOLTS TO THE FULL THREAD LENGTH!
IMPROPERLY ATTACHED, UNSUITABLE, OR DAMAGED EYE
BOLTS MAY CAUSE THE SLEW DRIVE TO FALL AND CAUSE LIFE-
THREATENING INJURIES.
2. Attach lifting gear to the eye bolts.
3. Start the transport.
POSITIONING THE SWING DRIVE
4. Determine the main load-carrying zone. The main
load-carrying zone is that area of the slewing ring
that is subject to the highest load, taking all aggres-
sive forces and torques, and all occurring load
cases into account.
5. Arrange the hardness gap of the bearing ring
charged with point load so that it is offset by 90° rel-
ative to the main load-carrying zone. The main load-
carrying zone is in the main slewing range.
THE HARDNESS GAP OR THE FILLING PLUG IN A SLEWING RING
CONSTITUTE A ZONE OF DECREASED LOAD-CARRYING CAPAC-
ITY. THE SERVICE-LIFE OF THE SLEW DRIVE WILL BE REDUCED
SIGNIFICANTLY, IF THE HARDNESS GAP IS IN THE MAIN SLEW-
ING RANGE. FRACTURE OF BEARING RING FOR EXAMPLE MAY
CAUSE SLEW DRIVE FAILURE. CONSEQUENTLY PLACE THIS
MARKED POINT IN A REDUCED LOAD ZONE IF POSSIBLE.
6. Use a feeler gauge to check whether the support
surface of the slew drive is completely supported by
the mounting structure. If this is not the case, the
support surface of the mounting structure must be
reworked.