General Machine Products 70601 Adams CD Lite Winch - Manual (Page 9)

The control valve available from the factory as an option for the CD Lite winch has been selected specifi-
cally for this application. The internal piloted relief valve is pre-set at the factory, and needs no field ad-
justment. The porting on the control valve was selected to minimize the amount of reducing fittings
needed. The spool is spring loaded in both directions so when the operator releases the lever or handle
(not provided), the spool automatically centers and stops the flow of oil out of the work ports. There is
a ʺpower beyondʺ port on the valve for additional valves downstream.
The fiber optic pendant control allows the operator to be tethered to the vehicle via a fiber optic cord to
operate the winch by remote control. The system has been engineered and designed to provide a holis-
tic approach to the design problem.
The system consists of a pressure generating valve, directional control valve with back cap, transmitter
with joystick, receiver and cabling. The joystick on the transmitter allows the operator to choose the di-
rection and speed of the winch drum rotation. The fiber optic cable connects the transmitter and re-
ceiver. The fiber optic cable, being non-conductive, helps electrically isolate the operator from unin-
tended electrical contact. The receiver accepts the signal from the transmitter and sends a digital signal
to the stepper motor in the back cap on the control valve. The control valve has all the features men-
tioned in the above section, plus the spool is positioned by the stepper motor. There are pre-
programmed values (non- field adjustable) in the receiver for deadband position, ramps up and down
and flow adjustment. The values have been optimized for use with the CD Lite winch.
3.02 HYDRAULIC REQUIREMENTS
To obtain the maximum rated pull and line speed using the hydraulic motor supplied with the CD Lite,
the hydraulic system shall have a rated flow of 30 GPM (114 l/min.) maximum. Hydraulic system pres-
sure shall be limited by a relief valve with a maximum setting of 2500 psi (17237
kPa). The minimum
recommended hydraulic oil reservoir capacity is 60 gallons (227 l) of petroleum-based hydraulic fluid.
Recommended hydraulic line diameters are
3 /
4
in. (19 mm) for: Pump to control valve; Control valve to
Page 8