Cullen, Sloman, Cantor, Grauer, Scott & Rutherford
Backhoe boom cylinder bleed circuit
 A bleed circuit for a backhoe boom cylinder which minimizes cylinder pressure during over-center movement of the boom while permitting the maintenance of sufficient cylinder pressure during other boom operations. The boom cylinder is provided with a retract port, a head end port, and a small bleed port with a bleed line connecting the bleed and head end ports. As the boom cylinder crosses over-center, the fluid pressure in the retract side of the boom cylinder may be transmitted from the rod end to the head end of the cylinder thereby reducing cylinder pressure and improving the over-center controlability of the boom. 
J.I. Case Company
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inventional inventional inventional
Roger D. Thomas R.
Mickelson Brown