HELP! BX24 LOST ALL HYDRAULICS!

[sngleshot]

I just finished digging out a small tree stump with my backhoe. Shut down the tractor briefly and when I came back and started it up... nothing. I mean NOTHING. Checked the hydraulic fluid and it was low. Added about one guart and it brought it right up. Only about 190 hours on this tractor. Serviced at dealer with 100 hours on it. I have NO idea what could be wrong. Hydraulic strainer or filter clogged? Just before this happened I bumped the PTO lever accidently and moved it back into MMM slot where I had it for cutting grass. I have an FEL and MMM attached at the same time. All implements are dead. What or where do I start looking??? Thanks in advance for any help or ideas.

ALSO: Not sure how I can relieve pressure on the outriggers, back hoe and FEL so that I can pull it up on my trailer if I have to take it into the dealer.

 

[J_J]

You probably ran out of fluid, so the pump was sucking air.

You already refilled, but you might as well check all filters.

To bleed any air out of the hyd system, just keep moving the levers to operate every cyl.

It should pick up prime, but if not, add some air to the hyd fill cap.

There are other possibility also.

Pump dead, relief valve stuck open, pump shaft sheared.

Check all of your QD's.

A 3000 psi pressure gage would help you determine if any component can develop pressure.

To raise the out riggers, have someone work the out rigger levers and lift of jack the out rigger up out of the way.

 

[Tx Jim]

Check to see that all hyd control levers are in neutral. I doubt that hyd system being one quart low on fluid caused the problem. Although 90 hrs of use on a filter isn't many hours I agree that changing hyd filter would be the place to start after checking hyd pressure with a gauge.

 

[oldnslo]

Does the power steering work? Does the front loader work? If the BX24 has a similar hydraulic system as the BX1850 & BX 2350 then one pump feeds oil into a priority flow control. The priority valve sends part of the flow to the steering and directs the excess to the implements. This pump is driven by the same shaft that drives the HST unit also. If the priority valve totally failed it is possible that it could block all flow and the pump would be going over the relief valve.

Not 100% sure but I believe the loader should be the first valve in the circuit, that would then feed the back hoe and the back hoe would feed the 3 point hitch if you have that option.

I agree with TX Jim that one quart low should not cause this problem.

 

[sngleshot]

IT'S FIXED! HYDRAULICS ARE BACK!

ALL: Thank you so much for the replies. Nice to know that we have the experience and knowledge available to all of us in this group. Especially valuable to a newbie like me. All is well after talking to a tractor service technician at the local Kubota dealer. That young man told me to check my hydraulic lines for the back hoe and that one had possible popped loose under hard working pressure... not separated but loose. This apparently causes some sort of relief valve closure (OR OPENING) that shuts everything down to protect the pump and implements? Not sure if I understood that correctly or not but... I went and check all the lines... and the first one I checked.. was indeed LOOSE! I reapplied the line and went to other two lines and they were all ok and hooked up firmly. So just that one loose hydraulic line.. shut everything down. Living and learning. I am SOOO happy as I know how expensive it would have been to have a tech come out to the house for just a loose line. Thanks again for the replies.

 

[oldnslo]

Glad it was a simple fix. I am still somewhat surprised the loader did not work though.

 

[J_J]

I do believe I mentioned the QD's in post #2.

If that was a pressure line, it would be hard to say which relief valve was dumping the pump flow to tank. Which ever relief had the lowest setting.

But anyway, there would have been relief pressure throughout the flow path at about 2500 psi.

You would think you would be able to use the loader or remote valves.

If you had a pressure gage in the hyd system, you would have seen the pressure cause by the unplugged hose.

You should also have heard the relief valve.