By Robert J. Sheaf, Founder, CFC Industrial
A student in one of our instructors’ hydraulic classes was having issues with his tractor upon startup. He said that they would sometimes have a tough time starting their John Deere JD 4020 tractor when it was cold or if the battery was getting weak.
The John Deere dealer offered them a simple solution — he told them to move the steering wheel back and forth while turning the key. The student said it worked every time.
The JD 4020 has a hydraulic circuit with a closed-center and pressure-compensating pump. Why would the tractor start easier when the steering wheel is constantly rotated back and forth, causing the steering wheels to turn?
Can you identify what was the problem? We welcome responses of all kinds directly to Robert Sheaf at firstname.lastname@example.org or to email@example.com. The solution will be provided in conjunction with our April 2024 issue.
Filed Under: Components Oil Coolers, Pumps & Motors, Technologies