|Major components of the
hydraulic system for DREC no-till drill.
Though the drill is pulled on the lower two links of the three point
hitch, the hitch remains level and the openers move up and down on their own. The accumulators, shown in the upper left
photo, equalize the pressure within the system. The memory valves show in the lower right
picture allow the openers to be lifted out of the soil at the end of a pass
and then when the openers are set back into the soil this valve “dumps” the
pressure of the system back into the openers so the pressure is the same as
in the previous pass. A load cell, not
pictured, located on the center opener detects the degree of penetration the
opener is experiencing. A meter in the
cab of the tractor provides information to the operator the amount of
hydraulic pressure in the system as well as on the load cell. The operator can make adjustments or a
computer can do this automatically.