JLG 15SP Service Manual - Manual (Page 41)

SECTION 2 - SERVICE PROCEDURES
3120775 – JLG Lift – 2-27
ft. lbs. Align the hole in the mounting journal with the
hole in the cylinder and Install the (1) 5/16" bolt.
15. New Design Cylinder: Install the mounting pin
through the side mounting brackets and the cylinder
valve body and through the mounting brackets on
the other side of the mast. Install the snap rings to
each end of the mounting pin.
16. Slide the chain anchor block onto the cylinder rod
end at the top of the lift cylinder. Locate the narrow
chain assembly set (single anchor plate with two
narrow chains). Lay out chain assembly with anchor
plate end towards mast, (be certain floor surface is
clean and free of any metal chip or debris which may
stick to lubricated chains or lay chains in a clean
bucket).
17. Align the holes in the cylinder rod, the chain anchor
block and chain anchor plate and slide the attach
pin through all, secure pin with snap ring.
18. Slide mast section-2 out of mast section-1 approxi-
mately one foot.
19. Assemble chain sheaves on chain assembly anchor
block (attached to cylinder rod end) and attach to
mast section-2 using following steps;
a. Insert sheave pin through anchor block on cylin-
der rod end.
b. Place sheave wheels (for wide chain) on sheave
pin, one each side of anchor block.
c. On outside of each sheave wheel, place a
sheave pin attach bar, (rectangular plate with
threaded holes on each side of pin bore hole).
d. Slide the whole anchor block assembly with
sheave pin, wheels and pin attach bars into top
of mast section-2. (Position anchor block with
narrow chains facing up).
e. Attach to top of mast section-2 using two (2) 3/
8"-16UNC x 1/2" long socket head-countersunk-
flathead cap screws each side. Coat threads
with Loctite #171 and tighten.
20. Slide mast section-2 back into section-1 until end
are even.
Mast Section 3 - Assembly
NOTE: When sliding mast sections together, be careful not
to scratch or score the anodized finish in the slide
pad channels.
21. Locate mast section-3, carefully slide section-3
closed rail into section-2 open rail. Slide sections
together until ends are even.
22. Locate one (1) of the chain bottom anchor plates
(one with threaded holes horizontally aligned to out-
side of bracket). Attach using outer set of holes in
bottom of mast section-3 with two (2) 1/4"-20UNC x
3/4" long bolts, place a flatwasher under head of
each bolt.
23. Slide mast section-3, approximately two feet out of
the top of mast section-2.
24. Install the triangular shaped chain upper anchor
plate to the top of mast section-3, using the remain-
ing large pin and pin keeper.
25. Locate the remaining narrow chain set and attach
them to the anchor plate just attached to the top of
mast section-3 in the previous step. Allow to hang
out the top of mast section-3 till later.
26. Insert the threaded the ends of chain assembly
(attached to top of mast section-1), into the opening
between mast section-2 and mast section-3. Slide
the threaded ends through the holes in bottom
anchor plate attached to bottom of mast section-3.
Loosely thread two (2) 3/8"-16UNC nuts onto stud
threads on each chain. Chains will be adjusted later
in assembly.
27. Assemble chain sheaves (for narrow chain assem-
bly) to top of mast section-3 as follows;
a. Locate the two (2) narrow chain sheave wheels
and slide onto sheave pin.
b. Slide two (2) short spacer tubes onto sheave
pin, one each end of sheave pin to outside of
sheave wheels.
c. Place two (2) sheave pin attach bars, one each
end of sheave pin to outside of space tubes.
d. Holding complete sheave wheel assembly, slide
assembly into top of mast section-3 and align
threaded holes in sheave pin attach bars with
holes in mast rails.
e. Attach to top of mast section-3 using two (2) 3/
8"-16UNC x 1/2" long socket head-countersunk-
flathead cap screws, each side. Coat threads
with Loctite #171 and tighten.
NOTE: When sliding mast sections together, be careful not
to scratch or score the anodized finish in the slide
pad channels.
28. Carefully slide mast section-3 into section-2 until
ends are even. Check to make sure chain assembly
(wide chains) are seating properly in chain anchor
block chain sheave wheels attached to mast sec-
tion-2.
29. Insert slide pads into the top end mast rails between
section-2 and -3, (one on each side of the mast),
with beveled surface facing inward towards section-
3.