JLG 15/20MSP Service Manual - Manual (Page 107)

SECTION 5 - MAST COMPONENTS
3121231 – JLG Lift – 5-17
5. Carefully slide mast section-5 out the BOTTOM of
mast section-4 rails. Disassemble slide pads, shims
and chain anchor plate from mast section-5, if nec-
essary.
Mast Section-4 - Removal
6. Remove chain adjust nuts from threaded ends of
chains attached to the chain anchor plate (lower) on
BOTTOM end of mast section-4. Push threaded
ends of chains 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).
8. Slide mast section-4 out the 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-3. Remove slide pads, shims and cable 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 the anchor plate.
12. 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).
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 screws securing
chain sheave wheel assembly attach bars on both
side rails at TOP of mast section-3 and remove the
sheave wheel assembly.
15. While mast section-3 is still extended from section-2
remove the pin attaching the chain anchor plate 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.
16. Carefully slide mast section-3 out BOTTOM of sec-
tion-2. Remove slide pads, and shims, if necessary.
Mast Section-2 - Removal
17. Slide mast section-2 out TOP of mast section-1 far
enough to allow access to the chain assembly
anchor block/sheave wheel assembly.
18. Remove countersunk-flathead screws securing
chain anchor block/sheave wheel assembly attach
bars on both side rails at TOP of mast section-2.
19. Slide the chain anchor block/sheave wheel assem-
bly and hydraulic cylinder out the TOP of mast sec-
tion-2 far enough to allow removal of the sheave
wheel attach bars, sheave wheels and sheave pin
from chain assembly anchor block.
20. Remove the setscrew holding the hydraulic cylinder
rod onto the chain assembly anchor block. Lay
chain assembly/anchor block to side.
21. Remove the hydraulic cylinder through BOTTOM of
mast section-2, be careful not to nick or score cylin-
der 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.
22. Carefully slide mast section-2 out BOTTOM of sec-
tion-1. Remove slide pads and shims, if necessary.
Mast Section-1 - Disassembly
23. Slide the TOP of remaining mast section-1 out over
edge of work surface and remove the pins attaching
the chain anchor block to mast section-1. Remove
chain/anchor block assemblies from mast and lay
aside.
24. Remove slide pads and shims from mast section-1.
Mast disassembly should now be complete.