JLG 19BD Service Manual - Manual (Page 59)

SECTION 2 - SERVICE PROCEDURES
3121154 – JLG Lift – 2-37
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 screws securing
chain sheave wheel assembly attach bars on both
side rails at top of mast section-6 and remove
sheave wheel assembly.
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.
MAST SECTION - 2 - REMOVAL
17. Slide mast section-2 out TOP of mast section-1 far
enough to allow access to the chain 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 the chain assembly anchor block.
20. Remove the snap ring from the pin attaching the
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.
21. 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.
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 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.
24. Remove the hydraulic lift cylinder from it’s mount
attached to mast section-1, if necessary.
25. Remove slide pads and shims from mast section-1,
is necessary.
Mast disassembly should now be complete.