Mast Section 4 Removal; Mast Section 3 Removal; Mast Section 2 Removal; Mast Section 1 Disassembly (All Masts) - JLG 12SP Service And Maintenance Manual

SECTION 2 - SERVICE PROCEDURES
NOTE: When sliding mast sections apart, be careful not to
scratch or score the anodized finish in the slide pad
channels.
5. Carefully slide short mast section-4/5 out BOTTOM
of mast section-3/4 rails. Disassemble slide pads,
shims and cable anchor plate from mast section-4/5,
if necessary.

Mast Section 4 Removal

NOTE: Steps 6 through 10 will be used only for five (5) sec-
tion mast assemblies. If disassembling a four (4)
section mast go to step 11, Mast Section 3 Removal.
6. Remove chain adjust nuts from threaded ends of
chain attached to the chain anchor plate on BOT-
TOM end of mast section-4. Push threaded ends of
cable through anchor plate.
7. At TOP of mast section-4, 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).
8. Slide mast section-4 out TOP of mast section-3 far
enough to allow access to the chain sheave wheel
assembly.
9. Remove countersunk flathead screws securing
chain sheave wheel assembly attach bars on both
side rails at TOP of mast section-4 and remove
sheave wheel assembly.
NOTE: When sliding mast sections apart, be careful not to
scratch or score the anodized finish in the slide pad
channels.
10. Carefully slide mast section-4 out BOTTOM of sec-
tion-2. Remove slide pads, shims and chain anchor
plate, if necessary.

Mast Section 3 Removal

11. 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.
12. At top of mast section-3, pull chains out and allow to
hang loose.
13. Slide mast section-3 out TOP of mast section-2 far
enough to allow access to the chain sheave wheel
assembly.
14. Remove countersunk-flathead
chain sheave wheel assembly attach bars on both
side rails at top of mast section-6 and remove
sheave wheel assembly.
2-22
15. While mast section-3 is still extended from section-2
NOTE: When sliding mast sections apart, be careful not to
16. Carefully slide mast section-3 out BOTTOM of sec-

Mast Section 2 Removal

17. Slide mast section-2 out TOP of mast section-1 far
18. Remove
19. Slide the chain anchor block/sheave wheel assemby
20. Remove the snap ring from the pin attaching the
21. Remove the hydraulic cylinder through the BOTTOM
NOTE: When sliding mast sections apart, be careful not to
22. Carefully slide mast section-2 out BOTTOM of sec-
Mast Section 1 Disassembly
23. Slide the TOP of the remaining mast section-1 out
24. Remove slide pads and shims from mast section-1,
screws securing
Mast disassembly should now be complete.
– JLG Lift –
remove the bolts attaching the two (2) chain assem-
bly anchor eyelets to the TOP of mast section-3.
Remove chains.
scratch or score the anodized finish in the slide pad
channels.
tion-2. Remove slide pads, shims and chain anchor
plate, if necessary.
enough to allow access to the chain anchor block/
sheave wheel assembly.
countersunk-flathead
chain anchor block/sheave wheel assembly attach
bars on both side rails at TOP of mast section-2.
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.
chain anchor block and chain anchor plate assem-
bly to the hydraulic cylinder rod end, then remove
the pin. Lay the chain anchor block and chain
assembly to side.
of mast section-2, be careful not to nick or score cyl-
inder rod surface while removing.
scratch or score the anodized finish in the slide pad
channels.
tion-1. Remove slide pads and shims, if necessary.
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.
is necessary.
screws securing
(All Masts)
3120775