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 05-17-2004, 10:59 Post: 86205
kubotaguy



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 how hot should a hydro get

I was mowing some tall grass the other day with the 60"MMM with my 7800 and I was wearing shorts and could feel heat coming from under the tractor. It didn't burn me but it didn't seem quite right. The when I finished and went to spray off the mower deck I hit the rear end with some spray and it turned into steam. I couldn't touch the rear end with my hand it was that hot. I was finished for the day so I put it away. I got it out the next day and it ran fine. The tractor has about 80 hours on it and I did the 50 hour maintenance. The grill and screen in front of the radiator both were clean. The brake was not set, the fluid level was fine and the temp. guage was not reading hot. Although it was very hot and humid outside when I was mowing and I was mowing very slow in medium range and then went down to low range. Any ideas????






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 05-17-2004, 16:26 Post: 86228
Art White



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 how hot should a hydro get

I could think of a lot of things until I finished reading that might be wrong but with what you were doing you are fine. I'd watch the situation but not worry unless you can find out exactly what it is.






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 05-17-2004, 17:54 Post: 86232
beagle

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 how hot should a hydro get

I'm a little surprised with Art's answer, but I guess that's good news. I mowed all day with my 7800 on Sunday, and although I never really checked, I didn't notice any heat from the rear end. The mower deck would load the engine hard, but shouldn't load the hydraulic system or the Hydro. I did mow in Low Range.

So I can keep my eye on my 7800, when you said the "rear end" was hot, was it the Hydro, Gear Case, or Differential Case, or maybe all of the above? If it wasn't for Art not being concerned, I would have guessed there was a possible problem with the hydraulic cooler circuit. I'll keep an eye on mine and see if I get any heat build up.






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 05-17-2004, 18:07 Post: 86234
oneace

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 how hot should a hydro get

From what I've seen in the past is some body mistakenly knock the remote valve in to the locked on position and caused the fluid to dead head through the relief. That will heat up fluid fast in fact in the shop we do that in intensionaly to get the fluid to normal operating temp. But you may or may not have a remote valve and if you do you will most likely not not have a detent to lock it to the on position. So I'm just rambling again. Any way if this continues try changing the hydro filter again. Then if that does not work get your dealer to flow test the unit to make sure there is not a relief valve sticking some where.






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 05-17-2004, 19:08 Post: 86240
hardwood

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 how hot should a hydro get

Hydros will run quite hot under heavy drawbar load, but if you were only mowing with a MMM it should'nt get hot enough to produce steam. I agree with what has allready been said about a remote valve being in a position to run fluid back thru the relief valve, that will cause lots of heat buildup fast. Another thing I thought about is the possibility of a hose being kinked off or a line that has been crushed that feeds the hyd fluid radiator in front of the engine radiator to cool it. I know basicly nothing about Kubotas, but I'd assume every mfgr. uses a fluid cooler on their hydro tractors. Frank.






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 05-17-2004, 20:43 Post: 86248
kubotaguy



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 how hot should a hydro get

Thanks for the replies fellas.
Beagle, I have mowed with my 7800 several times and it has never gotten that hot but then again this was some pretty tall and thick grass. When I said the rear end was getting hot, I was trying to spray the grass off the two wheels behind the mower in the middle and the water when up on the rear end and steam started coming off like crazy. Then when I got on the tractor to hook up the loader and put it away, I could feel the heat coming from underneath.
Oneace, you bring up another interesting point that I had a question on but forgot about. I have been taking my loader off to mow with and on the loader joystick piece that stays with the tractor there is a little lever that has a lock and unlock position. I've always left it in the unlock position. I can't find anything in my book about it. What is that lock and unlock thing for and could that be the cause of the problem.
On a positive note, I had it out a little bit this evening and everything seemed fine with it.






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 05-18-2004, 07:32 Post: 86276
beagle

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 how hot should a hydro get

That lock lever on the loader valve will lock out the joystick so you can't accidently bump the loader. It doesn't do anything hydraulically. Just thinking through this a little further, it sounds like you ae getting good cooling with the loader on, but might have a circulation problem with the loader off. The rear end should not get that hot from mowing, there just isn't a lot of load on the hydrostat from mowing. Have you noticed any heat build up with the loader? Maybe we can narrow down where the flow restriction might be, if there is one. Any chance you accidently left the loader joystick in the float position while you where mowing? If this happens again, check the hydraulic cooler coil behind the radiator. If it is cool, and the hydrosat is hot, there is a circulation problem somewhere in the system.






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 05-18-2004, 07:47 Post: 86277
Murf

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 how hot should a hydro get

All of our hydro.'s, including mine at here at home, will do exactly the same thing under load.

The problem seems to be that to do PTO work, like cutting grass, the engine must be running at 'PTO speed' but the tractor is moving forward at a relatively slow speed, that means the hydro pump is going flat out, but the excess flow is just cycling throught the reservoir heating everything up.

That heat is part of the losses I was talking about in the other thread about HST vs. gears.

Best of luck.






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 05-18-2004, 08:00 Post: 86280
jonathanengr



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 how hot should a hydro get

I'm glad to see a post on hydros... I have a question, too. Exactly how much noise should a hydro make??? My Dad has a 3130 FST, and when driving my 3430 HSTC said he was unnerved by all of the noise the tranny made. It does make quite a bit more noise--especially the slower you go.

Is all this noise normal? It just sounds very "strained", and since I've neevr been around them I didn't want to take any chances!






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 05-18-2004, 09:34 Post: 86287
beagle

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 how hot should a hydro get

This is my third hydrostat, all different manufacturers, and all have been whiners. The Kubota is actually a little better than the last two, but it is definitely a whiner. Just make sure you keep the fluid and filters clean and full.

Murf, shouldn't the overcharge fluid from the hydrostat still be circulated through the cooler?






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Discussion Boards > Active Subjects > Messages as Posted > Kubota Review Forum

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Art White 1 | beagle 4 | DRankin 1 | hardwood 1 | jonathanengr 1 | kubotaguy 2 | Murf 2 | oneace 2 | yooperpete 2 |

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