SECTION 5 - MAST COMPONENTS
31215825
5-23
36.
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.
37.
Assemble chain sheaves
(for narrow chain assembly)
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) narrow 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-flat
-
head capscrews, each side. Coat threads with
Medium strength Threadlocking Compound and
tighten.
38.
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.
Figure 5-23. Mast Section 3 - Chain/Anchor Plate
Installation (Mast Section-3 Shown Cut-away)
1.
Chain/Anchor Plate Assy.
4.
Pin Keeper
2.
Anchor Pin
5.
Keeper Screw (a)
3.
Spacer
NOTE:
(a) Apply Medium Strength Threadlocking Compound
to threads.
1
2
3
4
5
Figure 5-24. 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.
NOTE:
(a) Apply Medium strength Threadlocking Compound
to threads.
1
1
2
2
3
7
6
3
4
4
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