JLG 20VP (3120728) Service Manual - Manual (Page 45)

SECTION 2 - SERVICE PROCEDURES
3120728 – JLG Lift – 2-27
5. Carefully slide mast section-3/-4/-5 out BOTTOM of
mast section-2/-3/-4 rails. Disassemble slide pads,
shims and cable 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 cable adjust nuts from threaded ends of
cables attached to the cable anchor plate on bottom
end of mast section-4. Push threaded ends of
cables through anchor plate.
7. At top of mast section-4, pull cables 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 cable sheave
wheel assembly.
9. Remove countersunk-flathead screws securing
cable 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.
NOTE: Steps 11 through 16 apply to removal of mast sec-
tion-3 on 15VP (cable actuated) & 20VP (cable/chain
actuated) lifts. If servicing a 10VP mast, go to step
17.
11. Remove cable/chain adjust nuts from threaded ends
of cable/chain attached to the cable/chain anchor
plate on BOTTOM end of mast section-3. Push
threaded ends of cable/chain through anchor plate.
12. At TOP of mast section-3, pull cables/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 cable/chain sheave
wheel assembly.
14. Remove countersunk-flathead screws securing
cable/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) cable assem-
bly anchor eyelets to the TOP of mast section-3.
Remove cables.
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 cable/chain assembly
anchor block/sheave wheel assembly.
18. Remove countersunk-flathead screws securing
cable/chain anchor block/sheave wheel assembly
attach bars on both side rails at TOP of mast sec-
tion-2.
19. Slide the cable/chain anchor block/sheave wheel
assembly 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 cable/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 cable/chain anchor blocks to mast section-1.
Remove cable/chain assemblies from mast and lay
aside.
24. Remove slide pads and shims from mast section-1.
Mast disassembly should now be complete.