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Appendix — Glossary
energize — to send electrical power to a device, as to the coil of a
solenoid valve.
energized conductor — an apparatus that is transmitting electric
current.
energy — the ability or capacity to do work, measured in units of
work.
engine protection system — a system which detects when the
auxiliary engine oil pressure or temperature is out of the proper range
and shuts the engine off.
extendible — capable of linear movement of one or more portions of
an assembly to increase the overall length or reach of the assembly.
extendible-boom aerial device — an aerial device with a telescopic
or extendible boom assembly.
extension cylinder — a hydraulic cylinder which extends and retracts
an extendible boom(s).
fairlead — the group of steel rollers at the platform of a cable placer which
guide the cable or suspension strand during the placing process.
fairlead receptor tube — part of the pulling arms used to support
the fairlead.
fall protection system — a system consisting of a body harness or
body belt, a decelerating lanyard, connectors, and an anchor point at
the boom tip, used to catch and hold a person who falls from a plat-
form. (As of January 1, 1998, the use of a body belt for personal fall
protection is prohibited by OSHA.)
fan — part of the disc or drum chipper which propels chipped debris
and increases airow into the discharge chute.
feed box — assembly housing the feed roll(s).
feed roll — a mechanical controlled roll or rollers used to control the
feed rate to the cutter mechanism.
feed table — folding or xed position guard which restricts operators
access to the cutter mechanism.
feedback (feedback signal) — the return of part of an output signal to
the input for the purpose of modication and control of the output.
feeder tube — a telescopic hydraulic tube assembly mounted on an
extendible boom which carries pump ow to a device mounted on the
extendible portion of the boom such as a digger or boom tip winch.
FeedSense® — Automatically maintains cutter mechanism speed.
ber optic cable — a type of cable used for conducting control or
telecommunication signals, in which the signal carrier(s) is one or more
optical bers, enclosed within an outer covering.
ber optic receiver — an electronic module that collects ber optic
signals and converts them into electrical signals.
ber optic transmitter — an electronic module that converts elec-
trical signals into ber optic signals and sends them through a ber
optic cable.
ber optics — the use of transparent bers of glass or plastic which
transmit light signals throughout the length of the ber. Commonly used
to transmit signals from a remote control.
berglass — glass in brous form added as a reinforcement to a plastic
for use in making various products.
ller breather cap — the component on the top of a reservoir that
allows air to enter and exit the reservoir as the uid level changes,
and which can be removed to access a ll hole when adding hydraulic
uid to the reservoir.
lter — a device through which uid is passed to remove and retain
insoluble contaminants from a uid.
lter cart — a portable device which can be connected to a unit’s
hydraulic system to lter water and/or other contaminants out of the
hydraulic system uid.
lter cartridge — a component containing ltration material which is
installed within a lter housing or attached to a lter receptacle for use,
and can be removed and replaced as a self-contained unit.
rm footing — outrigger placement and extension in accordance with
the instructions in a unit’s operator’s manual to ensure proper leveling
of the vehicle and adequate stability when operating the unit.
xed displacement pump— a pump in which displacement is con-
stant, so that the output ow can be changed only by varying the
drive speed.
drain — a passage or a line from a hydraulic component that returns
leakage uid to the reservoir.
drift — 1: a gradual, uncontrolled change from a set position of an
actuator or component. 2: a tool for ramming or driving something.
driver — the gearbox and motor assembly on a reel lifter which is
connected to and disconnected from the arbor bar through the clutch
assembly.
drop pocket — an open top tool storage area on the chassis of a
unit.
drum — the rotating component, housing the knifes on a drum chip-
per.
drum chipper — a wood chipper which utilizes a drum shaped, rotat-
ing cutter mechanism.
drum clutch — a clutch consisting of two or more drive lugs that engage
similar driven lugs to transmit torque. Commonly used between the
gearbox and cable drum on front or bed mounted winches.
dump valve — a normally open, two-position, two-way valve that sends
pump ow through a path going directly to the reservoir or bypassing
hydraulic circuit when it is not actuated, preventing operation of the
hydraulic system or circuit. When it is actuated, it closes off this path,
redirecting ow to the hydraulic system or circuit to allow operation.
dynamometer — an instrument for measuring mechanical force or
power.
earth anchor — see screw anchor.
eccentric ring — a ring with the center hole located in a position off the
geometric center, commonly used to adjust the position of the rotation
pinion with respect to the rotation bearing gear teeth.
eccentric ring lock — a device which engages a hole or notch in an
eccentric ring to prevent the ring from rotating.
efciency — the ratio of output to input. Volumetric efciency of a pump
is the actual output in gpm divided by the theoretical or design output.
The overall efciency of a hydraulic system is the output power divided
by the input power. Efciency is usually expressed as a percent.
elbow — the structure on an articulating-boom aerial device that con-
nects the upper boom to the lower boom. The elbow allows the upper
boom to pivot relative to the lower boom.
elbow bearing — the rotating member that allows the upper boom to
rotate around the end of the lower boom. Used on aerial devices with
the upper and lower booms mounted side by side.
elbow pin — the horizontal pin that attaches the upper boom to the
lower boom on an articulating-boom aerial device. Used on aerial
devices with the upper boom mounted over the lower boom.
electrical harness — an assembly of electrical wires that is used to
deliver electrical current between components.
electrocution — receiving an electrical shock resulting in death.
electrohydraulic — a combination of electric and hydraulic control
mechanisms in which an electrically controlled actuator is used to shift
the spool in a hydraulic control valve.
electrohydraulic control system — a control system in which the
function control handles are connected to electric controls. The elec-
tric controls actuate electrohydraulic valves to operate the functions
of the unit.
electrohydraulic valve — a directional valve that receives a vari-
able or controlled electrical signal which is used to control or meter
hydraulic ow.
elevator lift — a system located between the turntable and subbase
of an aerial device which is used for lifting the aerial device to increase
the platform working height. This system may be congured as a single
elevator or a double elevator.
elevator unit — the overall device including the subbase, elevator lift
and the aerial device.
emergency operating DC pump — see secondary stowage DC
pump.
emergency operating system — see secondary stowage system.
end gland — a hollow, cylindrical part that screws into or is retained
in the open end of a hydraulic cylinder barrel, through which the rod
protrudes.
end-mounted platform — a platform which is attached to a mounting
bracket that extends beyond the boom tip, positioning the platform
(and platform rotation pivot, if so equipped) beyond the end of the
upper boom.
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