Elliott Digger Derrick, Operation & Maintenance Manual, Page: 205 / 376

Four Section Boom Operation-common EEC-0021 V1.3
Four Section Boom Operation
J. Remove top rear wear pads on the 2
nd
section. They will lift off the cam plates
easily. Do not remove or loosen the capscrews holding the cam plates to the
section. This will affect side clearance during re-assembly.
K. Loosen and remove four capscrews securing the rear bottom wear pads on the
2
nd
section. This pad serves as a bottom and side pad as well as the retract cable
keeper under the retract sheaves. Removal of this pad will allow the retract
cables to uncoil off the retract sheaves. Place retract cable ends in a location to
minimize the possibility of damage.
L. Loosen and remove six capscrews securing retract sheave pin and retract
sheaves to 2
nd
section. Remove sheaves and pins.
M. Loosen and remove two capscrews functioning as upper retract cable keepers.
Remove retract cables.
N. Loosen and remove two capscrews securing lock bar to the extend cylinder
collar. This bar constrains the vertical movement of the extend cylinder. Remove
bar.
O. Loosen capscrews retaining extend cable anchor to back of the 4
th
section. Total
removal of the capscrews will allow the cable anchor to be completely
disassembled, backing capscrews out approximately .50 inch (12mm) will allow
the anchor assembly to slide rearward out of the section as the extend cylinder is
removed.
P. Support extend cylinder with an appropriate lifting device and pull the extend
cylinder out of the boom while keeping the extend cables tensioned slightly by
hand to minimize the possibility of damage to the cables. Pull cylinder to within 3
feet (91mm) of complete removal from the boom sections.
Q. Reach into the rear of the 4
th
section and pull the extend cable anchor out from
its retaining pocket on the bottom of the 4
th
section. A slight angle applied to the
anchor as it is being pulled to the rear will permit easier removal through the 2
nd
and 3
rd
sections.