JLG G12-55A Service Manual - Manual (Page 42)

Boom
3-8 G10-55A, G12-55A
32. Remove the top rear wear pads, spacers, shims and
hardware (30) from the rear of the second boom
section.
33. Remove the left (or right) side rear wear pad, spacer,
shims and hardware (31) from the rear of the second
boom section.
34. Pull each boom section slightly forward to relieve the
tension in retract chain (32).
35. Remove the snap rings and pin connecting the rear
retract chain (32) from the chain clevis at the rear of
the boom. Allow chain to hang out over the rear of
the boom.
36. 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.
37. 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.
38. Remove both wear pads, spacers, shims, blocks
and hardware (29) from the front top of the first
boom section.
39. Remove both wear pads, spacers, shims and
hardware (30) from the front bottom of the first boom
section.
40. Adjust sling(s) around the second boom section to
help balance the second, third and fourth boom
sections.
41. Remove the remainder of the second, third and
fourth boom sections from the first boom section and
set on suitable supports.
3.5.2 Third & 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 the snap rings and pin connecting the rear
retract chain (3) from the chain clevis at the rear of
the boom. Allow chain to hang out over the rear of
the boom.
MY4140
29
28
28
30
29
28
28
30
MY4150
1
2
1
2
2 2
MY3590
3