Chapter 2 Specifications 9
System Specifications
POWER SOURCE
PTO DRIVEN - Integral mounted hydraulic pump and PTO application. Other standard power
sources may be used. Minimum power required is 23.5 horsepower based on 10 GPM (37.9
liters/min) at 3,000 PSI (207 bar).
CYLINDER HOLDING VALVES
The base ends (extend sides) of the lower boom and extension cylinders are equipped with
integral-mounted counterbalance valves to prevent sudden cylinder collapse in case of hose or
other hydraulic failure. The extend side of the lower boom cylinder is equipped with a 10 gpm
counterbalance valve. The counterbalance valve serves several functions; first, it is a holding
valve. Secondly, it is designed to control the speed at which the lowering function operates and
allows that motion to be metered under load. Finally, it prevents the loss of an excess amount of
oil in the event of a hose failure. Only the oil in the hose at the time of the failure will be lost.
ROTATION SYSTEM
Turntable bearing with external tooth worm gear powered with a high-torque hydraulic motor.
Standard rotation is 420º.
HYDRAULIC SYSTEM (PTO DRIVEN)
The hydraulic system is an open-centered, full-pressure system that requires 10 GPM (37.85
liters/min.) optimum oil flow at 3000 psi (207 bar). It is equipped with a four-section, stack-type,
electric, remote control valve. The system includes a separate hydraulic oil reservoir, suction
line filter, and return-line filter.
EXCESSIVE LOAD LIMIT SYSTEM (ELLS)
Overloading of the crane is limited by the ELLS system. The system consists of a pressure
switch which is mounted on the extend side of the lower boom cylinder and connected
electrically to the lift side of the winch, the extend side of the extension boom, and the down side
of the lower boom. If the operator attempts to lift a load exceeding the rated capacity of the
crane, the winch lift, extension out and lower boom down functions will not operate. To relieve
the situation, the operator may set the load down (winch down) or retract the extension boom
(extension in).
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