JLG 41EL Service Manual - Manual (Page 44)

SECTION 2 - SERVICE PROCEDURES
2-26 – JLG Lift – 3120782
60. Insert threaded ends of cable assembly (attached to
top of mast section-4) through the chain/cable
anchor plate located on bottom of extended mast
section-6. Loosely thread two (2) 3/8"-16UNC nuts
onto stud threads on each chain. Chains will be
adjusted later in assembly.
61. Slide mast section-6 back into section-5 except for a
foot or two of length.
62. While mast section-6 is still extended from section-5,
assemble cable sheaves to top of mast section-6 as
follows;
a. Locate remaining sheave pin. Slide two (2) cable
sheave wheels onto sheave pin and center.
b. Place two (2) short spacer tubes on sheave pin,
one on each end of sheave pin to outside of
sheave wheels.
c. Place two (2) sheave pin attach bars, one on
each end of sheave pin to outside of short
spacer tubes.
d. Holding complete cable sheave wheel assem-
bly, slide assembly into top of mast section-6
and align threaded holes in sheave pin attach
bars with holes in mast rails.
e. Attach to top of mast section-6 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.
63. Carefully slide mast section-6 back into section-5
until ends are even. Check to make sure cable set
from top of section-4 is seating properly in cable
sheave wheels attached to top of mast section-5.
(Mast sections-3, -4 and -5 may need to be
restrained to keep their slide pads from pushing out
the bottom of mast sections-2, -3 and -4).
64. Insert slide pads into the top end mast rails between
section-5 and -6, (one on each side of the mast),
with beveled surface facing inward towards section-
6.
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.
65. 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-5 and into the
slide pad inserts. Thread in enough to hold pad in
place.
66. Shim per instructions in step 7, Mast Section 2 -
Assembly.
67. Insert slide pads into the bottom end mast rails
between section-5 and -6, (one on each side of the
mast), with beveled surface facing out towards sec-
tion-5.
68. 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.
69. Shim per instructions in step 7, Mast Section 2 -
Assembly.
Platform Mounting Section - Assy. (All Masts)
NOTE: Reference to mast sections-5/-6/-7 made following is
dependent on which model machine you are servic-
ing since the 20 ft. machines use five (5) mast sec-
tions, the 25 and 36 ft. models use six (6) mast
sections, the 30 and 41 ft. models use seven (7)
mast sections .
70. Locate the remaing mast section-5/-6/-7 (platform
mounting - mast section). Lay mast section on flat
stable surface.
71. Attach the remaining chain/cable anchor plate (one
with threaded holes vertically aligned in center of
bracket). Attach through inner (vertical) set of holes
in bottom of mast section-5/-6/-7 with two (2) 1/4"-
20UNC x 3/4" long bolts, place a flatwasher under
head of each bolt.
NOTE: The platform mounting section slide pads, are
assembled differently than the slide pads for the
other mast sections. Mast section-5/-6/-7 slide pads
may need to be assembled/disassembled several
times in order to determine the correct shim stock
required for proper fit.
72. Complete the following steps to determine shim
stock thickness required for section-5/-6/-7;
NOTE: Always use the an even amount of shim material
behind slide pads on both sides of the mast rails.
This will keep mast sections centered in rail chan-
nels and prevent any distortion of the section.
a. Use two shim pieces per slide pad, a thick one
and a thin one.
b. Start with a total thickness of approximately
.035" and .075" thick shim stock.
c. Attach shim stock and slide pads to both sides
of mast section-5/-6/-7 using five (5) 1/4"-20UNC
x 1-1/4" long, hex head cap screws per side, with
flatwasher under each bolt head. (Assemble