BX1500 hydro problem???

[Brad d]

I have a 2004 BX1500 and it is getting weak in high range, right now the pump just seems to wine in high gear and the tractor has a hard time getting going.. the fluid lever is fine.. Do i need to rebuild the pump or drive? I have changed the filter and oil not that long ago.

 

[dex3361]

What kind of hyd oil did you put in the trans. Did you use Kubota filters? Did you clean the strainer when you changed the Hst oil and filter?

 

[Tom_H]

Just on the off chance this may have happened, are you certain that you changed the hydro fluid and filter and not the engine oil and dilter? Some old tractors did use that same oil system for both, but most tractors now have separate systems. You probably know that, but I'm asking just on the slight chance you might not have.

 

[Brad d]

I changed the engine oil and the hydro oil (filled from the back in the 3 point hitch, and filter next to the front mower deck PTO) Is there more that two oil systems on this thing? It gets worse as the fluid gets hotter.

Oh and I have only used Kubota products


I just added a small shim to the valve tonight seems to have helped.. Need a gauge to confirm the PSI.
Hydraulic Relief Valve Adjustment for Bx2230 and Bx1830 - TractorByNet.com

 

[Tom_H]

No, two is it. Possible explanations that come to mind are: obstruction in line somewhere, kink in hose somewhere, bad pump. Sorry not to be more help.

 

[Brad d]

thanks for the info guys, im pretty mechanical inclined.. but have no idea about tractors.. I do alot of turbo, engine and fuel injection stuff+ TIG/MIG welding...

Would the pressure relief spring just be weak.. I did add a small shim.. it seemed to help lot.. not too sure if its fixed but I will know in the morning when I go to put the bucket on it and load it up when digging in a pile of top soil..

I will also check the screen

 

[rdsaustintx]

If it is an HST flow problem, doubt the pressure relief will matter. Answer Dex's questions:

- What oil and filter did use for the HST?
- How many hours since the suction screen was cleaned?

(PS: high range ain't what ya use for loader work)

 

[Brad d]

- What oil and filter did use for the HST? Kubota brand from the dealer
- How many hours since the suction screen was cleaned? 75H or so

(PS: high range ain't what ya use for loader work) True but it has a hard time moving on flat ground with just the mower deck on. Makes a hum and does not want to move.


thanks again for the help guys

 

[dex3361]

I know this is a silly question but have you checked the brakes. If the brakes are stuck or left on then it will operate in low range but not in high range. Just a thought.

 

[alchemysa]

Did you clean the metal strainer? A blocked strainer can lead to exactly what you describe.

Its part 030 in the pdf attached. It just looks like the head of a large bolt.
The full parts manual is here.. Kubotabooks.com

And its mentioned in Messicks excellent service advice...
Kubota BX Service

 

[rdsaustintx]

- What oil and filter did use for the HST? Kubota brand from the dealer

UDT or SUDT? what filter number?

- How many hours since the suction screen was cleaned? 75H or so

Huh? The tranny fluid was out 75 hours ago too? I am talking about the screen under the banjo bolt behind the left rear wheel.

Dex had another VERY good idea. Check your parking brake. Common mistake to leave it on.

 

[Brad d]

UDT or SUDT? what filter number? Im not too sure about the oil.. its what the dealer gave me.. same with the filter.. the filter was painted gray.. no #'s on it.. i thought it was odd.



Huh? The tranny fluid was out 75 hours ago too? I am talking about the screen under the banjo bolt behind the left rear wheel. yeah it was acting up back then so i changed the fluid

Dex had another VERY good idea. Check your parking brake. Common mistake to leave it on. I will take a look but im pretty sure its off, the tractor does roll pretty easy in my shop


I dont know if things got worse after i borrowed it to a guy a few houses down the road.. he was using the loader and did not know it had low gear (he drove down to his house in high gear) when he came back he said "man this thing just wines when you try to load it up" then i told him when you are doing heavy work it needs to be in low dont know if thats what started this all, i wonder if it just squished the pressure relief spring so much from bypassing that its now shorter... hence lower PSI now


Im going out to cut the lawn now and I will let you know how it acts with a small shim added to the spring

 

[TPS]

Brad,
I hope that you get it figured out. One reason I would rather go do the work for a neighbor and I have rather than loan a tractor out is because you never know what they actually did to the unit. I do know it is not good to operate the fel a lot in high. I also hope the dealer gave you sudt as they is what is recommended on the change. Having said that, the only time I ever noticed a problem with my 1500 was when operating the FEL and BB and I left the hydraulic control lever partially up instead of the neutral position after raising the BB and took off up hill with a load on the FEL man it got real weak and had a whine to it. I stopped and noticed the lever position and put in in neutral and it smoothed right out and stopped the noise. Take care-TPS

 

[Brad d]

UDT or SUDT? what filter number?

humm.. i wish i still had the jugs around, are you saying that this fluid could cause a problem like that?