Patent Number: 6,293,479

Title: Feed control hydraulic circuit for wood chipper attachment

Abstract: A hydraulic circuit for a wood chipper attachment for a skid steer loader provides power to both a motor for driving a chipper wheel and a motor for driving a feed roller. A priority flow valve is provided to supply priority of flow to the chipper motor. As pressure increases on the chipper motor, the output from the skid steer loader pump reduces and the priority flow valve acts to reduce flow to the feed motor to reduce the infeed speed. The wood chipper is adapted to be mounted on a skid steer loader and utilize the hydraulic power source from the loader power source. A separate relief valve for the chipper wheel motor is set to relieve pressure if the chipper wheel motor stalls at a lower pressure than the relief valve for the hydraulic system on the skid steer loader so that the feed motor will have sufficient pressure for reversing the feed wheel.

Inventors: Kaczmarski; Wally L. (Lisbon, ND), Watts; Verne C. (Lisbon, ND), Majkrzak; David S. (West Fargo, ND), Cronin; Patrick M. (West Fargo, ND)

Assignee: Clark Equipment Company

International Classification: B27L 11/00 (20060101); B02C 025/00 ()

Expiration Date: 09/25/2018