JLG 41AM (3120872) Service Manual - Manual (Page 44)

SECTION 2 - SERVICE PROCEDURES
2-22 – JLG Lift – 3120872
20. Carefully slide mast section-4 out BOTTOM of sec-
tion-3. Remove slide pads, shims and chain anchor
plate, if necessary.
Mast Section 3 Removal (All Masts)
21. Remove chain adjust nuts from threaded ends of
chain attached to the chain anchor plate on BOT-
TOM end of mast section-3. Push threaded ends of
chain through anchor plate.
22. At TOP of mast section-3, pull chains out and allow
to hang loose, (be certain floor surface is clean and
free of any metal chips or debris which may stick to
lubricated chains or lay chains in a clean bucket).
23. Slide mast section-3 out TOP of mast section-2 far
enough to allow access to the chain sheave wheel
assembly.
24. Remove countersunk flathead screws securing
chain sheave wheel assembly attach bars on both
side rails at TOP of mast section-3 and remove
sheave wheel assembly.
25. While mast section-3 is still extended from section-2
remove the bolts attaching the two (2) chain assem-
bly anchor blocks to the TOP of mast section-3.
Remove chains.
NOTE: When sliding mast sections apart, be careful not to
scratch or score the anodized finish in the slide pad
channels.
26. Carefully slide mast section-3 out BOTTOM of sec-
tion-2. Remove slide pads, shims and chain anchor
plate, if necessary.
Mast Section 2 Removal
(All Masts)
27. Slide mast section-2 out TOP of mast section-1 far
enough to allow access to the chain anchor block/
sheave wheel assembly.
28. Remove countersunk-flathead screws securing
chain anchor block/sheave wheel assembly attach
bars on both side rails at TOP of mast section-2.
29. Slide the chain anchor block/sheave wheel assemby
and hydraulic cylinder out the TOP of mast section-2
far enough to allow removal of the sheave wheel
attach bars, sheave wheels and sheave pin from the
chain assembly anchor block.
30. Remove the setscrew holding the hydraulic cylinder
rod into the chain assembly anchor block. Lay chain
assembly to side.
31. Remove the hydraulic cylinder through the BOTTOM
of mast section-2, be careful not to nick or score cyl-
inder rod surface while removing.
NOTE: When sliding mast sections apart, be careful not to
scratch or score the anodized finish in the slide pad
channels.
32. Carefully slide mast section-2 out BOTTOM of sec-
tion-1. Remove slide pads and shims, if necessary.
Mast Section 1 Disassembly (All Masts)
33. Slide the TOP of the remaining mast section-1 out
over edge of work surface and remove the bolts
attaching the anchor blocks of the two (2) chain
assemblies to mast section-1. Remove chain assem-
blies from mast and lay aside.
34. Remove slide pads and shims from mast section-1,
is necessary.
Mast disassembly should now be complete.