Elliott Digger Derrick - Four Section Cable Tensioning

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Four Section Boom Operation-common EEC-0021 V1.3

Four Section Boom Operation

Lubrication of the extend cable sheaves located on the boom tip end of the

extend cylinder and the retract cable sheaves located on the inside rear of the 2

and

section and the extend cable sheave attached to the bottom of the top plate of the

second section at the sheave case end of the boom are accomplished with the boom

fully retracted. A grease zerk is located on each lubrication point.

Four Section Cable Tensioning

After boom reassembly or from time to time if interior proportioning cables appear loose,

cable tensioning may be required. Tensioning must be done with the boom horizontal

Slightly tighten all cables. Then cycle the boom approx. 4 feet (120cm) out and in a few

times to equalize the extend and retract cable/boom section sequence positioning.

A. Fully retract boom. Do not induce and hold hydraulic pressure. At full retraction,

observing through the winch mount end of the boom, the second section should

be bottomed on the extend cylinder butt plate, the third section should be

bottomed on the thick vertical side plates welded to the inside of the second

section, the fourth section should be bottomed on the thick vertical side plates

welded to the inside of the third section.

B. It is important to achieve these boom section positions before torqueing. If the

boom sections do not bottom out as specified (boom is out of sequence), adjust

cables to achieve proper section positioning. After proper section position has

been established, a scribe mark on all the sections at the boom tip end to identify

proper sections at the boom tip end to identify proper section position relative to

each other may be helpful during the tensioning process.

C. Torque 4/3/2 retract cables to 7 ft-lb (9.5 N.m). Cable adjustment point is located

at the sheave case end of the boom on the bottom of the 2

section. Use the

flats at the front of the cable ends to keep the cables from turning while torqueing

retainer nuts.