JLG 20VP (3120849) Service Manual - Manual (Page 42)

SECTION 2 - SERVICE PROCEDURES
2-24 – JLG Lift – 3120849
NOTE: When sliding mast sections apart, be careful not to
scratch or score the anodized surface in the slide
pad channels.
5. Carefully slide mast section-3/-4/-5 out BOTTOM of
mast section-2/-3/-4 rails. Disassemble slide pads,
shims and chain anchor plate from mast section-3/-
4/-5, if necessary.
NOTE: Steps 6 through 10 apply to removal of mast section-
4 on model 20VP lifts which have five (5) mast sec-
tions. If servicing a 15VP mast, go to step 11, or a
10VP go to step 17.
6. Remove chain adjust nuts from threaded ends of
chains attached to the chain anchor plate 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.
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 chain anchor
plate, if necessary.
NOTE: Steps 11 through 16 apply to removal of mast sec-
tion-3 on 15VP (chain actuated) & 20VP (chain actu-
ated) lifts. If servicing a 10VP mast, go to step 17.
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, (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.
NOTE: Step 15 applies only to 20VP lift models which have
five (5) mast sections. If servicing a 15VP mast, go
to step 16.
15. While mast section-3 is still extended from section-2
remove the bolts attaching the two (2) chain assem-
bly anchor eyelets 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, shims and chain anchor
plate, if necessary.
NOTE: Removal of mast section-2 (cylinder attach section)
is basically the same for all VP model lifts except
where noted.
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 into the chain assembly #444 anchor block. Lay
chain assembly #444 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.
23. Slide the TOP of remaining mast section-1 out over
edge of work surface and remove the bolts attaching
the chain anchor blocks to mast section-1. Remove
chain assemblies from mast and lay aside.
24. Remove slide pads and shims from mast section-1.
Mast disassembly should now be complete.