JLG G12-55A Service Manual - Manual (Page 44)

Boom
3-8 G10-55A, G12-55A
31. Remove top rear wear pads, spacers, shims and
hardware (30) from rear of second boom section.
32. Remove the left (or right) side rear wear pad, spacer,
shims and hardware (31) from the rear of the second
boom section.
33. Pull each boom section slightly forward to relieve the
tension in retract chain (32).
34. Remove snap rings and pin connecting rear retract
chain (32) from chain clevis at rear of boom. Allow
chain to hang out over rear of boom.
35. Place a sling around the second boom section. With
a suitable lifting device, slowly pull the second, third
and fourth boom sections approximately 25% out of
the first boom section.
36. With the second, third and fourth boom section still
connected to a suitable lifting device, remove all
wear pads, spacers, shims, and hardware (28) from
the front sides of the first boom section.
37. Remove both wear pads, spacers, shims, blocks and
hardware (29) from front top of first boom section.
38. Remove both wear pads, spacers, shims and
hardware (30) from the front bottom of the first
boom section.
39. Adjust sling(s) around second boom section to help
balance second, third and fourth boom sections.
40. Remove remainder of second, third and fourth boom
sections from the first boom section and set on
suitable supports.
3.5.2 Third and Fourth Boom
Section Removal
Note: Tag each wear pad, spacer, shim and hardware
from each location. Note the location of any grease fitting
(if equipped) on each wear pad.
1. Remove the top rear wear pads, spacers, shims and
hardware (1) from the rear of the third boom section.
2. Remove the left (or right) side rear wear pad, spacer,
shims and hardware (2) from the rear of the third
boom section.
3. Verify all disconnected hoses, tubes and fittings are
capped and/or plugged.
4. Pull each boom section slightly forward to relieve the
tension on the retract chain (3).
5. Remove snap rings and pin connecting rear retract
chain (3) from chain clevis at rear of boom. Allow
chain to hang out over rear of boom.
MY4140
29
28
28
30
29
28
28
30
MY4150
1
2
1
2
2 2
MY3590
3