JLG 15SP Service Manual - Manual (Page 42)

SECTION 2 - SERVICE PROCEDURES
2-28 – JLG Lift – 3120775
NOTE: Before fastening and shimming the slide pad on the
top left side of the mast, install a sequence cable
bracket against the mast under the flatwasher.
30. Thread slide pad attaching bolts, two (2) 1/4"-
20UNC x 3/8" long hex head bolts, place a flat
washer under head of each bolt, through holes in
outside rail, on top of mast section-2 and into the
slide pad inserts. Thread in enough to hold pad in
place.
31. Shim per instructions in step 7, Mast Section 2 -
Assembly.
32. Insert slide pads into the bottom end mast rails
between section-2 and -3, (one on each side of the
mast), with beveled surface facing out towards sec-
tion-2.
33. Thread slide pad attaching bolts, two (2) 1/4"-
20UNC x 3/8" long hex head bolts, place a flat
washer under head of each bolt, through holes on
inside rail, on bottom end of mast section-3 and into
the slide pad inserts. Thread in enough to hold pad
in place.
34. Shim per instructions in step 7, Mast Section 2 -
Assembly.
NOTE: If assembling the 12SP (4 Section) mast, skip the fol-
lowing Mast Section 4 - Assembly steps and go
directly to Platform Mounting Section - Assembly,
Step 43.
Mast Section 4 - Assembly
NOTE: When sliding mast sections together, be careful not
to scratch or score the anodized finish in the slide
pad channels.
35. Locate mast section-4, carefully slide section-3
closed rail into section-3 open rail. Slide sections
together until ends are even.
36. Locate one (1) of the chain bottom anchor plates
(one with threaded holes horizontally aligned to cen-
ter of bracket). Attach using holes in bottom of mast
section-4 with three (3) 1/4"-20UNC x 3/4" long bolts,
place a flatwasher under head of each bolt.
37. Slide mast section-4, approximately two feet out of
the top of mast section-3.
38. Insert threaded ends of chain assembly (attached to
top of mast section-2), into the opening between
mast section-3 and mast section-4. Slide the
threaded ends through the holes in bottom anchor
plate attached to bottom of mast section-4. Loosely
thread two (2) 3/8"-16UNC nuts onto stud threads on
each chain. Chains will be adjusted later in assem-
bly.
39. Assemble chain sheaves (for narrow chain assem-
bly) to top of mast section-4 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-4 and align
threaded holes in sheave pin attach bars with
holes in mast rails.
e. Attach to top of mast section-4 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.
40. Carefully slide mast section-4 into section-3 until
ends are even. Check to make sure chain assembly
(narrow chains) are seating properly in chain anchor
block chain sheave wheels attached to mast sec-
tion-3.
41. Insert slide pads into the top end mast rails between
section-3 and -4, (one on each side of the mast),
with beveled surface facing inward towards section-
4.
NOTE: Before fastening and shimming the slide pad on the
top left side of the mast, install a sequence cable
bracket against the mast under the flatwasher.
42. Thread slide pad attaching bolts, two (2) 1/4"-
20UNC x 3/8" long hex head bolts, place a flat
washer under head of each bolt, through holes in
outside rail on top of mast section-3 and into the
slide pad inserts. Thread in enough to hold pad in
place.
43. Shim per instructions in step 7, Mast Section 2 -
Assembly.
44. Insert slide pads into the bottom end mast rails
between section-3 and -4, (one on each side of the
mast), with beveled surface facing out towards sec-
tion-3.
45. Thread slide pad attaching bolts, two (2) 1/4"-
20UNC x 3/8" long hex head bolts, place a flat
washer under head of each bolt, through holes on
inside rail on bottom end of mast section-4 and into
the slide pad inserts. Thread in enough to hold pad
in place.