Rear axle temp

[Arrow1]

Hey Im new but have been a reader since I got my B2620 new last spring. I mow about 4 acres of law and have 132 hours on my tractor. I have and issue with the rear axle seems to be running hot. After about an hour of mowing I can feel the heat on my back side. The dealer said I should be able to touch it for about 10 sec before I feel like it will burn my hand. Well I can only do it for about 5 sec. Either im a wimp or it is getting hot. I got heat gun over the weekend and will check it next time I mow. The hydo has fliters and fluid has been changed and looked to be in great shape.. Has anyone had this issue before and what should the temp be when I check it. . I have enjoyed reading and learning from this forum. Thanks for any info

 

[Muhammad]

Welcome to TBN.

 

[Andrewnewy]

The touch test is not very accurate! Rear axles will get hot when working, the tricky part is testing it, ideally the oil inside should sit around 60-70deg C

Absolute max temp would be 80deg C anything more and you'll damage seals

Offten if it's getting to hot, it's due to a blocked filter, or undersized return line.
Or even not enough oil to cool properly.
That said there are also 1000&1 other potential problems.

The best way to test it is with a non contact infrared thermometer, you can pick these up cheap on eBay. And test the oil temp not the axle casing

 

[Briana03]

Hello & WELCOME to TBN!

I moved your thread to the Kubota Owning/Operating Forum.

 

[sw03]

was not 100 deg F over amb is normal?

 

[Texas Fella]

100 degrees (F) over ambient temperature is considered normal for hydraulic oil when it is being "worked" in a tractor. Worked meaning that the hydraulics are being used, whether by an HST, loader, 3 point (up and down, not just an implement sitting there) or rear remotes. 200 degree (F) oil does not do damage to seals in Kubota tractors. May cause issues in other, more complex circuits, but not Kubota's. This was the rule of thumb that I have heard all my life and has been quoted to me by numerous "company" men over the years.

 

[Andrewnewy]

100 degrees (F) over ambient temperature is considered normal for hydraulic oil when it is being "worked" in a tractor. Worked meaning that the hydraulics are being used, whether by an HST, loader, 3 point (up and down, not just an implement sitting there) or rear remotes. 200 degree (F) oil does not do damage to seals in Kubota tractors. May cause issues in other, more complex circuits, but not Kubota's. This was the rule of thumb that I have heard all my life and has been quoted to me by numerous "company" men over the years.

Doesn't mater what make tractor you have, anything over 80deg C (176deg F) is doing damage to hydraulics, not to mention loss of pressure as the oil becomes thinner.

Also out of all the tractors we work on, the Kubota has probably the cheapest , lowest spec hydraulic system we've come across.

 

[Texas Fella]

Don't want to get into an big argument here. I am just sharing what the Kubota people have told me on numerous occasions (and what I learned at eh university) and sharing my observations from the field. I have seen many units that when being worked in the field have hydro oil temps in the 190-200 range that have been running for years with no issues.

 

[brandoro]

After mowing (RFM) the trans housing and filters are quite hot to the touch. Don't think I would want to hold my hand on there 10 seconds, 5 maybe. This is mowing on a hot day, thick grass and the AC on so everything is making heat and the engine is working moderately hard. I agree not very precise but better than nothing.
My tractor is about 20 hours away from the 300 hour service. I'm planning to switch to synthetic trans/hydraulic fluid then and do expect it to run cooler with that. That has been my experience with everything I have put synthetics in previously.

 

[Arrow1]

Update on rear axle temp. Mowed for and hour temp was 174. When a finished an hour later it was still the same. Also the issue with my pedal sticking done when going forward is gone after some greasing at the rocker under the deck. I feel a little better knowning it's not around the 200 range. I will update my dealer with my finding and see what they think. Thanks for the help everyone.