SECTION 5 - MAST COMPONENTS
5-18
– JLG Lift –
3121228
Mast Section 4 - Assembly
1. Lay the narrow chain set attached to the cylinder
attach anchor block at the top of mast section-2 into
the open rail on mast section-3.
NOTE:
Before sliding mast sections together, spray the slide
pad channels with Krytox lubricant spray, (JLG P/N-
3020041). Be careful not to scratch or score the
anodized finish in the slide pad channels.
2. Carefully slide mast section-4 into section-3 until
ends are even.
3. At the bottom of mast section-4, install the slide
pads between mast section-3. and 4. Shim per
instructions in step 7, Mast Section 2 - Assembly.
Apply Loctite #242 to the threads of the pad screws
on final assembly.
4. Slide mast section-4 out the top of mast section-3
approximately 1 ft. (31cm).
5. Locate the lower chain anchor bracket
(one with the
threaded attach holes in a triangular shape pattern)
.
6. Working at the bottom end of mast section-4, insert
the threads (stud) ends of the (narrow) chain set,
now laying between mast section-3 and 4, into the
holes of the lower chain anchor bracket. Loosely
thread two (2) 3/8"-16UNC nuts onto the stud
threads on each chain.
7. Slide the anchor plate into the closed rail at the bot-
tom of mast section-4 and attach the anchor plate to
the bottom of mast section-4 with three (3) 1/4"-
20UNC x 3/4" long bolts. Apply Loctite #242 to
threads on final assembly.
8. Slide the top of mast section-4 back in even with the
top of mast section-3.
9. 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-
3.
10. Thread slide pad attaching bolts, two (2) 1/4"-
20UNC x 3/8" long hex head bolts 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.
Top of Mast Section-3 - Narrow Chain Set Layout
1.
Narrow Chain Set
Attached to Chain Anchor
Block on Mast Section-2.
2.
Chain Anchor Block
3.
Mast Section-3
Bottom of Mast Section-4 - Slide Pad Installation
1.
Slide Pads
2.
Shim Stock
3.
Shim Pad Screws (Apply
Loctite #242)
Bottom of Mast Section-4 - Chain Anchor Installa tion
1.
Lower Chain Anchor Bracket
2.
Anchor Bracket Screws (a)
3.
Narrow Chain Set Studs
4.
Chain Adjust and Jam
Nuts
Note:
(a) Apply Loctite #242 to threads on final assembly.
