Re: Hyd oil getting very hot - why?

Posted by fixitforfree on June 11, 2005 at 07:05:45 from (4.226.231.8):

In Reply to: Re: Hyd oil getting very hot - why? posted by Haas on June 11, 2005 at 06:51:19:

The motor doesn't seem loaded at all like the hyd system is under load while not using it. I now own this tractor but used to run it with a 9' sickle mower for my best friend I bought it from for 5-6 years before I bought it from him. Back then (about 8 years ago), we put a brand new hyd pump on it as it got to where it wouldn't lift the sickle mower even when cold. I suspect this "new" hyd pump is now getting weak but why? I suspect there is some problem in the system causing the fluid to get so hot it's ruining the pumps. I say this because this "new" hyd pump we installed 7-8 years ago probably doesn't have 600-700 hours on it and it was out of the box new, not rebuilt. Why would it wear out so quickly? Keep in mind, now the hyd. system seems to work perfect before the fluid gets real hot. No noise, pwr strg is fine, lift is very smooth. After it gets hot it's fine, just doesn't seem as strong and needs the motor revved to do the same work as it would have done at idle when cold. Could there be bad o-rings, sticking valves in the "control" mechanism under the seat causing the hot fluid which could be causing premature pump failure and, thus, my entire problem?

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