Hydraulic
System
The STC 60 is designed for use with an open center
hydraulic system when equipped as standard. The system
requires an approximate 10 horsepower to supply 6
gallons per minute and 2400 PSI. Power supply is generally
a direct mounted pump and PTO for truck chassis applications,
however other power supplies can be utilized. Crane
utilizes a four section, stackable, electric solenoid
operated directional control valve with a 25 foot
hard wired pendant control. A pressure relief is not
supplied. In instances where a relief cannot be incorporated
into other hydraulic system components, the optional
inline relief should be ordered.
Holding Valves
The base (extension) end of both boom lifting and
extension cylinders are equipped with pilot operated
counterbalance valves built into the cylinder. The
counterbalance valve provides protection from boom
collapse in the event of a hydraulic system failure
or hose break. In addition, the counterbalance valves
smooth lowering of the boom under load and also act
as a thermal relief to prevent excessive pressure
build up due to thermal expansion of the hydraulic
oil.
Winch System
The winch is powered by a low-speed high-torque hydraulic
motor through a 38:1 ratio worm gear with an automatic
mechanical brake for load holding. Winch system is
equipped with 75' of 3/8" diameter wire rope of 6
x 25 construction. A ball bearing swivel hook is provided
for single line applications and a 2-part line block
is provided. Overhaul weights may be optionally supplied.
Rotation System
Rotation is accomplished by a turntable bearing, driven
by a lowspeed high-torque motor through a worm gearbox.
The 85:1 ratio is self locking to prevent movement
when the rotation system is not operating. Continuous
rotation allows fast boom movement to any rotational
position.
Overload Protection
An active overload protection system is standard.
The system senses overload conditions and prevents
operation of boom extend and winch raise functions
in the event of an overload. Boom retract and winch
lower functions remain operational and allow crane
operation to alleviate the overload condition. When
systems are within rating limits the system will automatically
reset to normal operation.
Controls
Equipped as standard, control of the crane is provided
by a hard wired remote pendant providing on-off operation
of crane functions. Switches provided are military
spec sealed toggle, capable of reliable operation
in harsh operating environments which may be encountered.
Optional Equipment
Electro-Hydraulic Flow Control
System provides an electrically controlled variable
flow control valve which is operated at the remote
control pendant. The valve will allow control of the
oil volume supplied to the crane directional valve
and therefore will control the crane function operating
speeds. This system uses the same control switches
as the standard on-off control in conjunction with
a variable controller to regulate crane function speeds.
Control Pendants
The standard remote pendant can be equipped with a
rotary actuator for control of electro-hydraulic flow
control system described above. A hard wired pendant
may be optionally supplied which uses an index finger
trigger actuator for true one hand control of all
crane functions and function operating speeds. A radio
remote control is also available which provides operation
of the crane without wired cables and allows complete
freedom of movement. The unit is FCC approved and
uses a multiple coding system to eliminate any possibility
of accidental operation. The radio remote may be equipped
for on-off or remote speed control operation.
Stabilizers
Stabilizer systems can be provided in manual or hydraulic
versions. A standard configuration is available or
a custom design can be provided for specific requirements.
Winch Options
Optional worm gear or planetary winches can be supplied
in single speed or two speed versions which can provide
line speeds of more than 100 feet per minute single
line, using hydraulic flows recommended for standard
cranes.
Other Options
A variety of other equipment
accessories and options can
be provided to meet the needs of specific applications.
Special equipment includes lifting hooks, flow adjusters
to allow user changeable selection of maximum crane
function speeds, inline relief valves, pallet forks,
grapples and other items too numerous to mention.
Please contact us for evaluation of any special requirements
you may have.
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