JLG 19BD Service Manual - Manual (Page 52)

SECTION 2 - SERVICE PROCEDURES
2-30 – JLG Lift – 3121154
pin keeper. Allow to hang out the top of mast sec-
tion-3 for later assembly.
41. Insert the threaded the ends of chain assembly
(attached to top of mast section-1), into the opening
between mast section-2 and mast section-3. Slide
the threaded ends through the holes in chain anchor
bracket attached at the bottom of mast section-3.
Loosely thread two (2) 3/8"-16UNC nuts onto stud
threads on each chain and remove any slack in the
chains. Chains will be adjusted later in assembly.
42. Assemble chain sheaves (for narrow chain assem-
bly) to top of mast section-3 as follows;
a. Place four (4) of the 1" flat washers onto one of
the remaining sheave pins. Locate two (2) nar-
row chain sheave wheels and slide onto sheave
pin on each side of the flat washers.
b. Slide two (2) short spacer tubes onto sheave
pin, one each end of sheave pin to outside of
sheave wheels.
c. Place two (2) sheave pin support bars, one each
end of sheave pin onto outside of spacer 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.
d. Holding complete sheave wheel assembly, slide
assembly into top of mast section-3 and align
threaded holes in sheave pin support bars with
holes in mast rails.
e. Attach to top of mast section-3 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.
43. Slide mast section-3 back into section-2 until ends
are even. Check to make sure chain assembly (wide
chains) are seating properly in chain anchor block
chain sheave wheels attached to mast section-2.
Mast Section 3 - Sheave Wheel Assembly
1. Support Bar Screws (a) 5. Narrow Washer
2. Pin Support Bars 6. Sheave Pin
3. Wide Spacers 7. Square Keys
4. Sheave Wheel Assys.
Notes: (a) Apply Loctite #242 to threads.
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