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Re: Hyd oil getting very hot - why?
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Posted by Nat on June 11, 2005 at 06:10:46 from (24.93.8.168):
In Reply to: Hyd oil getting very hot - why? posted by fixitforfree on June 10, 2005 at 22:15:20:
Pumping the oil under high pressure causes it to heat up. As it heats up, it gets thinner. I would expect that your hydraulic pump is somewhat worn. The thicker oil "seals" the worn areas of the pump and allows it to produce more pressure at lower RPMs. Once the oil thins out, this seal is lost, so you need to run the tractor at a higher RPM to develop the pressure. Hydraulic oil will ALWAYS heat up when the tractor is running. After all, it's being used to run the power steering and other systems besides the 3PT lift and remotes. What you need to determine is if the oil is getting excessively hot, or if what you're seeing is normal. If the oil is getting excessively hot, and you're not using the hydraulics heavily, then there might be a restriction in the system somewhere. Could be a valve that's not centering properly to let the oil flow through freely.
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