JLG G12-55A Service Manual - Manual (Page 45)

3-9 G10-55A, G12-55A
Boom
6. Place a sling around the third boom section. With a
suitable lifting device, slowly pull the third and fourth
boom sections approximately 25% out of the second
boom section.
7. With the third and fourth boom section still
connected to a suitable lifting device, remove all
wear pads, spacers, shims, and hardware (4) from
the front sides of the second boom section.
8. Remove both wear pads, spacers, shims, blocks and
hardware (5) from front top of second boom section.
9. Remove both wear pads, spacers, shims and
hardware (6) from the front bottom of the second
boom section.
10. Loosen and remove the wear pad support plate (7)
from the bottom front of the second boom section.
11. Adjust sling(s) around the third boom section to help
balance the third and fourth boom sections.
12. Remove the remainder of the third and fourth boom
sections from the second boom section and set on
suitable supports.
3.5.3 Fourth Boom Section Removal
1. Place a sling around the fourth boom section and
slowly pull the fourth boom section approximately
25% out of the third boom section. Lower the fourth
section boom head onto a suitable support.
2. With the fourth boom section still connected to a
suitable lifting device, remove all wear pads,
spacers, shims, and hardware (8) from the front
sides of the third boom section.
3. Remove top and bottom front wear pads, shims and
blocks (9) from the third boom section.
4. Loosen and remove the wear pad support plate (10)
from the bottom front of the third boom section.
5. Adjust the sling(s) around the fourth boom section
for stability. Balance the fourth boom section and
slowly pull the fourth boom section out of the third
boom section being careful not to damage any
surrounding components.
6. Lower fourth boom section onto a suitable support.
MY3450
5
4
4 4
4
5
6 6
7
MY3510
9
8
8 8
8
9
9 9
10