JD 5210 Hydraulics Hot

[coosa]

I am pretty sure that my 2012 5075e is designed in a similar manner to yours. I actually traded a 5210 for this one. I had an experience a lot like you have described a couple of years after I bought it.

I had not used the tractor for a couple of weeks and ran it for a couple of hours pulling a 7' disc. It was a hot day and I was aware that the surface of the tractor was hot, but the temp gauge was reading normal. I went to turn at the end of a row and had no brakes at all. I brought it in and used a laser thermometer on it and found the temp at the PTO output was 301. I shut it down and let it sit for an hour and it ran normally when I started back up.

I talked to some folks about it and decided it would be best to change the hydraulic fluid and filter. The tractor had 200 hours when that happened, and it has gone 600 since without it happening again. The best guess as to what happened seems to be that a hydraulic valve somewhere didn't open properly, probably because it had been sitting without cranking for a while. That may not be right, but I am thankful that it hasn't happened again. I hope this helps in figuring out your issue.

I remember that I was using my 5210 in the woods one day and a stump punched a hole in the hydraulic filter. I immediately lost steering and brakes, so it would make sense that overheated hydraulic fluid could cause you to lose brakes like the 5075 did.

 

[Harry in Ky]

I have a few questions on this problem myself. I'm not quite sure on the supply of brake fluid on these tractors. I suspect it's part of the steering return flow but I can't confirm that. With a gear drive transmission, there are no clutch packs to supply, so other than transmission lube what need is there for a transmission pump? I'm not aware there is one.

As for brake lines, They originate in the engine compartment, so heat is present, but why would that suddenly make a difference?

I'd be leaning toward the brakes themselves. Fluid pressure present when applied, possible mechanical problems inside, that sort of thing. Wet brake issues can be the source of hydraulic oil heat, not just a result.

 

[Tx Jim]

Harry
You're correct & thank you for bringing my mistake to my attention. I incorrectly stated trans pump supplies oil to brake valve. I was thinking about older model JD utility tractor's hyd systems when I made that incorrect statement.

I'm not sure which hyd pump(PS or 3pt/scv) supplies oil to brake valve reservoir on 5210