Elliott Digger Derrick, Operation & Maintenance Manual, Page: 212 / 376

Four Section Boom Operation-common EEC-0021 V1.3
Four Section Boom Operation
HH. Visually verify that the extend cables are properly routed on their sheaves
and continue to slide with the extend cylinder and cables into the boom sections.
Keep extend cables supported and slightly tensioned during insertion of cylinder
to maintain proper cable placement.
II. As the extend cylinder nears complete insertion into the 2
nd
-3
rd
-4
th
section
assembly, adjust the height of the cylinder to allow the cylinder anchor collars to
access the cylinder keeper cutouts in the doubler plates on the sides of the 2
nd
and 3
rd
sections.
JJ. Drop the cylinder down into the vertical cutouts in the doubler plates on
the sides of the 2
nd
and 3
rd
sections. Cylinder length or boom section placement
may have to be adjusted to allow cylinder collars to drop into their proper
position.
KK. Install lock bar and capscrews to the extend cylinder collar in the 3
rd
section.
LL. Install large extend cable anchor into anchor cutouts in the doubler plates
in the rear of the 2
nd
by routing extending cables through the anchor and the
small cable over the anchor. Slide anchor fully into cutout.
MM. Install keeper plates and hardware. This keeper plate retains both the
horizontal movement of the extend anchor and the vertical movement of the
extend cylinder.
NN. Install 2
nd
-3
rd
-4
th
section boom assembly into 1
st
section boom, use caution
when sliding sections together, 3
rd
retract cables must maintain their position to
prevent damage, do not let boom rest on cables. Damage will result.
OO. Assemble bottom front wear pads for 1
st
section.
PP. Using appropriate lifting device, lift 2
nd
-3
rd
-4
th
section assembly to allow for
wear pad installation in front of 1
st
. Install wear pads. Slide sections together
within 12 inches (30cm) of full retraction.
QQ. Install upper spacer to front of 1
st
section.
RR. Install front side wear pads with appropriate shims between 2
nd
and 1
st
sections. If boom has been disassembled and no sections have been replaced,