JLG DVSP Series Service Manual - Manual (Page 109)

SECTION 5 - MAST COMPONENTS
3121136 – JLG Lift – 5-21
48. Slide section-4 out the top of section-3 approxi-
mately one (1) foot.
49. 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 until all slack is taken out of chain.
Chains will be adjusted later in assembly.
50. Assemble chain sheaves (for narrow chain assem-
bly) to top of mast section-4 as follows;
a. Locate the remaining sheave pin and slide the
wide tube spacer onto the pin shaft.
b. Place two (2) of the narrow chain sheave wheels
onto the sheave pin on each side of the wide
spacer.
c. Slide two (2) 1" flat washers onto each end of
sheave pin to outside of sheave wheels.
d. Place two (2) sheave pin support bars, one each
end of sheave pin to outside of space tubes.
Place a roll pin in the slots at each end of the
sheave pins and align with the cutouts in the pin
support bars.
e. Holding complete sheave wheel assembly, slide
assembly into top of mast section-4 and align
threaded holes in sheave pin support bars with
holes in mast rails.
f. 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.
51. 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.
Mast Section 4 - Chain Anchor Bracket
(Bottom of Mast)
1. Chain Anchor Bracket 3. Anchor Bolts/Washers (a)
2. Mast Section 4
Note: (a) Apply Loctite #242 to threads.
1
2
3
Mast Section 4 - Sheave Wheel Assembly
1. Support Bar Screws (a) 5. Wide Spacer
2. Pin Support Bars 6. Sheave Pin
3. Narrow Washers 7. Square Keys
4. Sheave Wheel Assys.
Note: (a) Apply Loctite #242 to threads.
1 1
2 2
3 3
5
6
7
4 4