parsonsponyz 115 #1 Posted July 19, 2023 I know this is probably answered already but couldn't find. I have a 93 520H and worked fine until couple of weeks ago when my son was mowing and the hydro temp light started flashing after approximately 45 minutes. I immediately had him stop and I changed the oil and filter and cleaned around the transmission. We just came back from mowing and it came on again and remained on until shut off. I was wondering if anybody else encountered this problem. Reaching out hoping it could be a bad sending unit, slipping belt but know it probably runs deeper. Any ideas appreciated. Share this post Link to post Share on other sites
Rick3478 428 #2 Posted July 20, 2023 I'll start with obvious stuff you didn't mention. Parking brake left on? Clogged or chewed up fan, or torn loose from shaft spinning free? 1 Share this post Link to post Share on other sites
wallfish 17,000 #3 Posted July 20, 2023 Got to be pretty careful what you write or say now a days! LoL @Docwheelhorse Tony and I were just discussing this exact thing at the show last week! Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,046 #4 Posted July 20, 2023 Click on the fuzzy picture 1 Share this post Link to post Share on other sites
lynnmor 7,307 #5 Posted July 20, 2023 The plastic fan is held on with one small bolt in the center, be sure that it is tight and the fan cannot be turned by hand. That small bolt needs to be installed with threadlocker since it can't be made extremely tight because of the plastic. The cooling fins on the hydro can only be completely cleaned by removing the seat and fender, if you go that far remove the fuel tank as well and do a complete cleaning. Engine cleaner and a garden hose will work well. I clean a mowing tractor that way every year. 2 Share this post Link to post Share on other sites
WHX?? 48,821 #6 Posted July 20, 2023 Is the tranny actually getting hot? Maybe a problem with the idiot light? Just trying to cover all the bases. Share this post Link to post Share on other sites
JoeM 7,874 #7 Posted July 20, 2023 going back to the old bush mechanic days, did you feel the oil filter to see how hot it was? should be uncomfortable to hold on to, and if it is too hot you will let it go real quick. Other than that you need a no touch temp gun. That oil will take up to 190 ish no problem. On a good note, if you have not lost any performance, chances are the sender, dirt fins or fan is the issue. Typical internal issues with Eaton 11 hydro's will make performance suffer and show up real quick as the oil is heated up. 1 Share this post Link to post Share on other sites
parsonsponyz 115 #8 Posted July 21, 2023 Thanks for all the advice, it gives me something to try this weekend. I'll have to take the steps mentioned and also watch my wording. Share this post Link to post Share on other sites
