Mast Assembly - Mvl/Msp - JLG 15MVL Series Service Maintenance Manual

Mast Assembly - MVL/MSP

Mast Section 1 - Assembly
1. Place mast section-1, rail (open) side up (See Figure
5-5. on page 5-16) on a clean, flat surface (prefera-
bly a table or work bench capable of supporting the
weight of the entire mast assembly). Slide mast out
over end of work surface far enough to allow access
to the chain anchor attach hole near the top of the
mast.
2. Locate the two (2) single (wide) chain assemblies
and attach to the large equalizer anchor plate (if not
already attached). Lay out the chain/anchor plate
assembly with the anchor plate end towards top of
the mast. (Be certain floor surface is clean and free
of any metal chips or debris which may stick to lubri-
cated chains).
3. Insert the chain/anchor plate assembly end into the
top of mast section-1 and secure using the large
anchor plate attach pin, spacers, and pin keeper.
1
2
Chain/Anchor Plate Installation
(Mast Section-1 - Shown Cut-Away)
1. Anchor Plate Pin
2. Short Spacer
3. Chain/Anchor Plate Assy.
Note: (a) Apply Loctite #242 to threads.
3121231
4
6
5
3
4. Long Spacer
5. Pin Keeper
6. Keeper Screw (a)
– JLG Lift –
SECTION 5 - MAST COMPONENTS
Mast Section 2 - Assembly
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.
2
1
Figure 5-7. Mast Bottom End - Slide Pad Installation
(Typical)
1. Slide Pads 2. Shim Stock
Note: (a) Apply Loctite #242 to threads.
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.
3
3. Slide Pad Bolts/Washers (a)
5-19