The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2025
Filed:
Sep. 30, 2024
Deere & Company, Moline, IL (US);
John R. Mahrenholz, Dubuque, IA (US);
Deere & Company, Moline, IL (US);
Abstract
A hydraulic system is provided with a pump supplying pressurized hydraulic fluid through a first supply line to a closed center control valve. From the control valve the fluid is directed through work lines to a hydraulic motor. Exhausted hydraulic fluid from the hydraulic motor is directed through the control valve to an exhaust line having a back pressure check valve set at a first pressure level. To keep the exhaust line fully charged a second supply line extends between the first supply line and the exhaust line. The second supply line is provided with a pressure reducing valve that is set at a second pressure level that is greater than the first pressure level of the back pressure check valve. An oil conditioning circuit is disposed between the back pressure check valve and a return tank for persistent hydraulic fluid conditioning.