JLG 9MP Service Manual - Manual (Page 57)

SECTION 5 - MAST COMPONENTS
3121163 – JLG Lift – 5-13
MAST SECTION 2 - ASSEMBLY
IMPORTANT
SPRAY THE SLIDE PAD CHANNELS WITH KRYTOX LUBRICANT AT
ROOM TEMPERATURE BEFORE ASSEMBLING MAST SECTIONS
TOGETHER AND SHIMMING SLIDE PADS.
NOTE: When sliding mast sections together, be careful not
to scratch or score the anodized finish in the slide
pad channels.
4. Locate mast section-2, carefully slide mast section-2
closed rail into section-1 open rail. Slide sections
together until ends are even.
5. Insert slide pads into the slide pad channels at bot-
tom end of mast between section-1 and -2, (one on
each side of the mast), with beveled surface facing
out towards section-1.
6. 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
mast section-2 inside rail, into the slide pad inserts.
Thread in enough to hold pad in place.
7. Shim slide pads using the following steps:
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 mast section.
a. Start with a .036" thick shim and a .075" thick
shim per side at each slide pad.
b. Slide shims into place between slide pad and
mast rail. Tighten the slide pad mounting bolts,
be sure there are no air gaps between shims,
shim and mast or shim and slide pad when tight-
ened.
c. Check mast section for side play. If play exists
add .015" shims dividing the thickness equally
between both sides of mast. Insert shims until
the shims cannot be inserted halfway by hand
with the mast pulled to the opposite side.
d. When mast slide pads are shimmed properly,
there should be no side to side movement of
slide pad in rail channel. Mast sections should
be snug in channels but still be able to slide in
channel by hand.
8. Insert slide pads into the slide pad channels (top of
mast) between section-1 and -2, (one on each side
of the mast), with beveled surface facing in towards
section-2.
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.
9. 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
mast section-1 outside rail (top of mast) and into the
slide pad inserts. Thread in enough to hold pad in
place.
10. Shim per instructions in step 7, Mast Section 2 -
Assembly.
1. Slide Pads 2. Shim Stock 3. Slide Pad Bolts/Washers (a)
Notes: (a) Apply Loctite #242 to threads.
Figure 5-7. Mast Bottom End - Slide Pad Installation
(Typical)
1
2
3
1. Slide Pads 3. Sequence Cable Bracket
2. Shim Stock 4. Slide Pad Bolts/Washers (a)
Notes: (a) Apply Loctite #242 to threads.
Figure 5-8. Mast Top End - Slide Pad Installation
(Typical)
1
4
4
2
3