Mowing Transmission Overheats

[gadoves1]

I have a 08 JD 5103 tractor with approx 1650 hrs on it. I primarily use it for mowing my 25
acre pecan orchard. The problem I am having now is the transmission gets so hot that it nearly burns my hand to touch
any part of the transmission housing. I replaced the hyd fluid filter this morning and that did not help at all. Has anyone out there had a similar problem? Thks for your response. BTW, I am not using JD Hy Gard fluid but generic from from Tractor Supply.

 

[MHarryE]

First - are you sure the transmission is overheating now and ran at a cooler temperature before? It doesn't need to be extremely hot to be too hot for touch. I use an infrared temperature gun to periodically check my tractors. Super accuracy is not important - I have cheap ones from Harbor Freight in each of my tractors.
Second - your tractor has an open center hydraulic system. If for some reason a valve is stuck or something similar happens, all the oil will be pumped over the 2800 psi relief and it will overheat quickly.
Third - the 3 point system - if the feedback is out of adjustment, the hydraulics can still be getting a signal to raise when the arms are at the top. Check to make sure this isn't causing the hydraulic system to run continuously at relief.
Tractor Data indicates you have 2 hydraulic pumps - a 6.8 gpm steering pump and a 9.5 gpm pump for other hydraulic functions. Need to check both systems.

 

[RjCorazza]

I forget the actual number, but I believe 120 deg f is close to where an object is too hot to maintain contact with. A transmission is definitely going to be too hot to touch when up to temp. My past 2 tractors (hst) would get up to 190-200 deg f when worked.

 

[jenkinsph]

I would agree with using an infrared thermometer and check the hydraulic functions. I would also check the hydraulic oil cooler to make sure it is clean too on a regular basis.

 

[RPW]

You changed the filter but did you clean the screen in the differential? It's right next to the PTO shaft. You'll have to drain the hydraulic fluid. About 10 gallons.