B2910 Hydraulic Fluid Aerating

[Rover]

Are there any more updates on this thread? My 2910 is starting to show this problem after mowing with my MMM. Its a very early 2910 (#50384) and is approaching 200 hrs.

This would seem to be from the hydro fluid getting too hot, since its doesn't have a problem until things get hot.

Rover

 

[fordman]

Rover
That sounds just exactly like the same thing mine was doing.Finally after 6 months we got it fixed.The first thing wrong as far as the steering goes,is the power steering relief pressures where set around 450psi to low.They should be set at 1636 to 1778psi with the engine totally hot at 2600 rpm.After raising my pressures up it made my steering turn really easy,as it felt like the front tires are off the ground.After using my MMM for 2 or 3 hours and then droping to an idle,the steering is not quite as free, but as soon as you give it any throttle at all it is back to normal.Kubota say this is normal because you loose approx. 10 to 15% of your psi and flow after the fluid is really hot.As far as my FEL goes it was almost the same story,it was set about 200psi to low also.It is set at 2000psi and Kubota says it wont hurt a thing to set it a little high,so we set it at 2150psi and that is at full throttle.And that is on a LA402,but if you look at the LA302 it has 1 1/2"
cylinders instead of the 1 3/4" on the LA402 but the LA302 sets at 2200psi.After raising my pressure up my loader works better than it ever did.

 

[chim]

The steering on my B7500 would get "lumpy" and difficult to turn after running ay PTO speed with the RFM for an hour or so. It seemed temperature-related. I took IF readings on the fluid cooling coils for reference (forget what the were, but i I posted them at one time). To see what would happen with cooler fluid, when it began to misbehave, I kept it running and sprayed water on the coils to drop the temp. It "fixed" the problem immediately.

The tractor was delivered with UDT. I changed the fluid at the 50 hour interval using UDT again, per my dealer's recommendation. The problem continued. I did tell my dealer about it so it wouldn't be a warranty issue later.

At 250 hours, I changed to Super UDT and the problem has yet to return.

Keep the screens and radiator fins clean as well. Don't know about your tractor, but my B7500 has the battery planted right in front of the coils and radiator - right where you'd think the engineers would want uninterruppted airflow.................chim

 

[Rover]

Thanks for the tip Chim,
My screens are clean and I'm running Super UDT after my 50 hr. service. I was thinking about using some AMSOIL to see if that would help and/or adding an extra cooler, but that for a different thread.

Just comparing this to my B8200 I traded in for the B2910, it had 11 less horsepower, no power steering and 3.5 liters more hydro in its case.

IMHO Kubota needs a bigger tank for the hydro oil and/or a better cooler for the B2910.

Rover

 

[Rover]

Update,

I talked to my dealer today, he hasn't see any tractors in his shop for this problem and was unaware of PSB. Thanks for posting the number here. He looked the PSB number up and looks I'll get this put in about 3 weeks, I'll also have him check the pressure at that time also. I figure this is not a big problem in this area as it is in hotter parts of the country.

BTW this is covered under 4.5 hrs of warrenty work for the dealer and looks like a fairly detailed tear down of the tractor just to get to the lines.

Rover