Operating the Machine HYDRAULIC CONTROL System Operation The hydraulic angle control and the wheel transport assemblies are operated by a single hydraulic circuit off of the tractor, which supplies oil to the selector valve located on the front gang carrier of the disk harrow (See HYDRAULIC CONTROL SCHEMATIC on following page). The oil enters the selector valve through the top two center ports. Oil is shifted to one of the two sets of the lower side ports (each side being a pair.) One side feeds through the 1750-PSI relief valve to operate the hydraulic angle control cylinder. The other side of the selector valve supplies oil for the transport lift cylinders. The rod end of all the transport lift cylinders must return oil through the pressure-locking valve, which is attached to the selector valve. This valve prevents wheel drift (lowering of the wheels) when the harrow is open in angle and plowing. For Transporting the Harrow Close harrow to 0 degree of angle. Install transport lock pin. Push the selector valve handle to TRANSPORT CONTROL position. Raise the harrow and install transport locks for safe transporting. For Field Operation Fully raise the harrow and remove the transport cylinder locks. Lower the harrow by fully raising the wheels off the ground. Pull the selector valve handle to ANGLE CONTROL position operation. Remove transport lock pin and store in field operation hole.
Note: Additional hydraulic system information can be found in the INSTALL HYDRAULIC CONTROL GROUP area of the ASSEMBLY section.
