Altec DRM 12, Руководство пользователя

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14
Appendix — Glossary
terminal block — an insulating mounting used for making electrical
terminal connections.
test block — a manifold with ports for connecting a hydraulic pressure
source, pressure gauge and a cartridge valve such as a counterbalance
valve or relief valve used for testing and adjusting the relief setting of
the valve.
thimble — a metal ring around which a rope is passed and spliced to
make a loop or eye.
thread locking adhesive — an anaerobic adhesive that is applied
to fastener threads to prevent loosening due to vibration or repeated
loading.
three-phase — a system for transmitting high voltage, alternating cur-
rent, electrical power along three separate conductors, with 120 degrees
between the voltage waveform cycles of any two conductors.
three-position valve — a valve having three positions for direction
of fluid flow, such as neutral, flow in one direction, and flow in the op -
posite direction.
three-way valve — a valve having three ports for direction of fluid
flow.
threshold — the amount of signal (starting power) given to a control
valve when the control is just moved from neutral position.
throttle control — a manual, hydraulic, or electrical device used to
regulate vehicle or auxiliary engine speed.
toggle switch — an electrical switch operated by a short projecting
lever combined with a spring to quickly open or close a circuit when
the lever is pushed through a small arc.
tongue weight — the downward weight applied by the towable equip-
ment on the hitch ball. Generally tongue weight should not be more
than 10 percent of the gross trailer weight.
topping cylinder
— see lift cylinder.
torque — 1: a rotational twisting force. 2: to preload a threaded fastener
by application of a rotational twisting force.
torque converter — a rotary device for transmitting and amplifying
torque, especially by hydraulic means.
torsion bar — a rod-like spring which is flexed by being twisted about
its axis, used to assist in stabilizing a mobile unit.
tow line winch — a winch located on a cable placer which is used
for tensioning suspension strand or self-supporting cable or towing a
cable lasher.
tow vehicle (towing vehicle)
— the vehicle that pulls a trailer or
towed vehicle.
trace element analysis — analysis of a small sample of hydraulic fluid
to determine contamination level and condition of additives.
tracking — a current leakage path created across the surface of
insulating material when a high-voltage current forms a carbonized
path within a foreign material on the surface.
transducer — a device that converts input energy of one form into
output energy of another, such as hydraulic pressure into an electri-
cal signal.
transferable boom flares — boom flares, on which a pole guide may
be mounted, that can be pinned to either the intermediate boom tip or
the upper boom tip of a digger derrick.
transferable upper controls — an upper control panel on a digger
derrick that can be attached to either the upper boom tip or the trans -
ferable boom flares by the use of a detent pin.
transition — the area between the feed box and the cutter mecha-
nism.
transmitter — a device used to generate and emit a radio frequency
carrier signal. The signal is sent to a receiver which translates the
signal into usable information.
trim pot — a potentiometer which is used to make fine adjustments
in a circuit during manufacture or calibration, typically by turning a
slotted adjusting screw.
troubleshoot — to locate and diagnose problems in a system or a
component.
trunnion — a mounting device consisting of a pair of opposite, projecting
cylindrical pivots on which something can be rotated or tilted.
trunnion bearing — a bearing that a trunnion pin pivots in.
trunnion pin — a cylindrical pivot pin that is a part of a trunnion.
turnbuckle — a link with screw threads at both ends that is turned to
bring the ends closer together for tightening purposes.
turns from finger tight (T.F.F.T.) — a method of counting the number
of turns of a hydraulic adapter to establish a torque value.
turntable — the structure located above the rotation bearing which
supports the lower boom or articulating arm, and rotates about the
centerline of rotation.
turntable winch — a winch located on the turntable.
turret — see turntable.
two-blocking — a condition in which the load hook, overhaul ball, hook
block, or other lifting component that is attached to the winch line comes
in contact with the boom tip during winch or boom operation.
two-man platform — a platform designed to carry two people. It is
usually 24 ″ wide x 48 ″ wide.
two-part line — a multiple-part line on a digger derrick in which the
winch line is routed from the boom tip sheave down to a snatch block
at the load and then back up to a stationary attachment point on the
boom.
two-position valve — a valve having two positions for direction of
fluid flow, such as open and closed.
two-speed motor — a motor which has two operating speed and torque
modes (a low-speed, high-torque mode, and a high-speed, low-torque
mode) that can be selected by the operator.
two-way valve — a valve having two ports for direction of fluid flow,
with one internal flow path which can be open or blocked.
ultraviolet inhibitor coating
— a sprayed or brushed on layer that
provides ultraviolet light resistant properties.
UNC — Unified National Coarse, a thread description.
underframe — an outrigger weldment mounting position located
beneath the unit subbase or vehicle chassis frame.
undertighten — to torque a threaded fastener below the recom-
mended value.
UNF — Unified National Fine, a thread description.
unfold — to move a pivoting structure such as an articulating upper
boom away from its stowed position.
unit — the Altec device(s), subbase, outriggers, body and associated
interface items mounted on a chassis, but not including the chassis
itself.
unload — to release hydraulic flow, usually directly to the reservoir, to
prevent pressure buildup.
unloaded vehicle weight — the total weight of the completed mobile
unit without payload.
unloading valve — a valve that bypasses flow to the reservoir when
a set pressure is maintained on its pilot port.
upper arm — the primary load-carrying structure of a double elevator
which is located between the riser and the upper pedestal.
upper arm cylinder — the hydraulic cylinder that moves the upper
arm of a double elevator up and down.
upper boom (UPR BOOM) — the boom section in a boom assembly
which is farthest from the turntable when the boom assembly is fully
extended or unfolded, and which supports the boom tip sheave and/
or platform(s).
upper boom cylinder — the hydraulic cylinder that moves the upper
boom about its pivot point on an articulating-boom aerial device.
upper boom drive mechanism — the components used to produce
upper boom movement on an articulating boom-aerial device, such as
linkage, cables, sheaves and/or gears.
upper boom rest — the structural member that supports the upper
boom in the rest or travel position.
upper boom tip — the boom tip of an upper boom.
upper control valve — the hydraulic valve on or beside the platform
of an aerial device used for operating some or all of the functions of
the aerial device.
upper controls — the controls located on or beside the platform used
for operating some or all of the functions of the unit.
upper controls primary battery — the preferred source of power for
fiber optic upper controls.