TM 9-2320-269-10
GLOSSARY - CONTINUED
BASKET LINER
A thermo-fused insulating insert for the mancarrying basket.
BASKET PIVOT
The area about which the basket rotates so the man in the
basket stays vertical to the different elevation angles of the
derrick leg.
CONSOLE
Derrick operator's station consisting of a cabinet which houses
the derrick, turret rotation, turret winch and digger controls.
CONTROL TUBES
Telescopic mechanical linkage which provide control functions at
the mancarrying basket.
DERRICK LEG
The outer, or main section of the steel tube hinged to the turret.
This section has a fixed length and houses the derrick leg
hydraulic extension and manual fiber glass insulating extension.
DIGGER
Hydraulic powered device which uses the auger to drill pole
holes. Mounted on the upper end of the derrick leg hydraulic
extension.
DIGGER RETURN LINE
The drain lines which return the digger hydraulic motor oil back to
the oil reservoir tank.
ELEVATION CYLINDER
A double acting hydraulic powered cylinder which elevates the
derrick leg assembly.
EXTENSION CYLINDER
A double acting hydraulic cylinder which extends and retracts the
derrick leg safety and prevents electric wires from making
contact with the steel leg extension.
HEAD SHEAVE
Pulley w/guard mounted on the outer end of the hydraulic leg
extension for guidance of the turret winch wire rope.
HYDRAULIC LEG
The telescopic section of the derrick leg which is hydraulic
EXTENSION
powered to extend and retract.
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