Loader--no up & down

[Anonymous Poster]

I recently posted a message about the front end loader on my Kubota B6200. When I was moving snow, it stopped working in terms of raising and lowering. I did as some of you suggested. I made sure the quick disconnects were well seated. I moved the tractor into a heated garage, where it has been a couple of days. I checked the fluid level. When it is running and I move the joy stick for the raising and lowering positon, the hose leading into the box where the joy stick is flexs and the pump "screams" as they say.

So to me, the pump appears to be working and fluid seems to be coming to the control box. This has to be because the loader emptys and closes. My question is, what do I do next? Start taking lines apart? The next snow storm is just around the corner and I live far back from the road.

I await your expert suggestions.

Thanks.

Tom

 

[Thomas]

Thomas,
This is a shot in the dark.
If you have a hydraulic flex check to see if under pressure the line sucks in,for the line maybe weak and slowing or stoping the fluid.

I would also any fitting w/ a 45 or 90 degree which might have debris.

If you have a air compressor try blowing out the lines,but make sure both ends are disconnected.

Have you spray where the joy stick goes into the control box with something like WD40.

Hope this helps.

Thomas..NH /w3tcompact/icons/wink.gif

 

[DFB]

When you unplugged the fittings was there any fluid there? did you try to depress the ballvalve in the coupler?

 

[MReeter]

Tom,After installing the loader and filling the cylinders with oil,that might have been just enough to lower the oil level.The pump"squealing"sounds like the resevoir is low.Either that or the oil is just to stiff and wont flow.Just a thought.

 

[TomG]

A common test to see if a hydraulic hose is getting pressure is to set an implement down, grab on to a cylinder feed hose, and then actuate the control valve. If a hose a getting pressure, it can be felt to stiffen. I guess that's what the comment about hose flexing means.

If the hoses don't stiffen, then pressure isn't getting past the control valve. The fact that the curl works, but the lift doesn't means the valve assemble and open centre flow are likely OK. However, the 'screaming pump' probably is the system pressure relief valve. If screamed all the time, then the open centre flow likely is obstructed. If it only screams when the loader lift valve is actuated, then the lift circuit is likely obstructed.

What I'd do is to swap the lift and curl lines. If the lift starts working and the curl stops, then the lift control valve probably is obstructed. If the lift still doesn't work, then something in the lift circuit or the loader itself probably is the problem.

One other test that could be done is to put the lift valve in float position. The bucket should be able to be raised easily with a 5' bar and block. If the bucket floats easily, then the loader arms aren't binding, and oil is free to flow from one side of the cylinders to the other. I believe the oil path in float position goes through the control valve but does not use the open centre flow.