Hydraulic Drive - CONCORD 2800 Operator's Manual

3. Operation

3.6 Hydraulic drive

Air systems equipped with the hydraulic drive option use electric-over-hydraulic (EOH) technology to
control the meter speed independently of ground speed. This gives the operator a faster calibration
procedure and on-the-go rate changing capability as well as the option to apply product to a
prescription map using GPS.
The hydraulic control valve uses 18.9 l/min (5 gal/
min) of hydraulic fluid flow from the fan circuit to
power the variable rate drive motors. An electro-
proportional flow-control valve controls the speed
of each motor, letting the meters turn at speeds
completely independent of each other.
Fig. 10
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