Bourgault tillage units are designed with a master/slave system to control the operating depth (either single or dual-series). This approach avoids the use of complex linkage systems that wear and stretch dramatically affecting the depth control.
A precision Line Lock Valve helps to ensure that the working depth never changes during operation. In addition, the Line Lock Valve ensures that any tractor hydraulic leaks are isolated from the cultivator.
In-Line Filter System
The hydraulic fluid for the depth control is filtered going into the master cylinder when the unit is lifted. Contaminants are released back to the reservoir when the frame is lowered so that hydraulic cylinder shafts and seals are protected from scoring.