Hydraulics messed up ONLY when loader is on tractor

[tcnjdeluca]

Hello,

I have a deutz allis 6240 with a loader. I took the loader off in the spring to do some mowing. It was off for a month maybe two and I put it back on, since then it has been acting very poorly, like air is in the system. This can affect the 3 point and even the steering. I checked the fluid, I actually had it overfilled after I burst a steering line and replaced it. Today I drained it back down to the proper level. The problems are the same if not worse. The thing is if I disconnect the loader everything works fine. The tree point lifts strong and smooth and the steering as it should. Could something be wrong with the loader itself? I really know nothing about hydraulics so any help would be appreciated.

Dan

 

[J_J]

Hydraulics:
Type: open
Capacity: 14.8 gal [56.0 L]
Valves: 1
Pump flow: 17.7 gpm [67.0 lpm]

If the valve and cyl hoses are connected correctly, everything should work as before.

Where is the input for the loader valve coming from.

Do you have a hyd gage you can use to check pressures?

Is the OUT hose going to tank?

Is the loader valve in series with the power steering?

Can you describe the flow path from pump through all valves to tank?

With the loader valve in neutral, the fluid should just pass through the loader valve.

If the steering valve is first in series, it may take fluid away from the loader.

 

[ericb2400]

are all the connections between the tractor and loader good and tight? I had a quick connect not connected all the way between my Kubota and loader and it behaved very badly. Loader would not move 3pt would not lift... If you are lucky may be an easy fix.

 

[wdchyd]

are all the connections between the tractor and loader good and tight? I had a quick connect not connected all the way between my Kubota and loader and it behaved very badly. Loader would not move 3pt would not lift... If you are lucky may be an easy fix.

^^^^^^^^^^^^^^^What he said..

 

[oldnslo]

Does the valve stay with the tractor or does it get removed with loader?
If the valves stays on the tractor loader on or off should make no difference.
the valve is removed with the loader then hoses could be swapped or a Quick Disconnect not connected properly like ericb stated.

 

[tcnjdeluca]

The valves stays with the tractor when the loader comes off. Just 4 quick connect hoses attach right to the controller. From what I can the steering and 3pt act differently with the loader in and the loader off. The only other difference from the last time I had it on is a new hose attached to the power steering pump. I don't see any leaking but I will pull off the hood.

I am not sure the hydraulic routing, but will check the shop manual today. It is very frustrating, it seems to be much worse now that the proper amount of fluid is in then when I had it overfilled.

 

[J_J]

Does the hyd for the loader come from the hyd block?

If the loader is disconnected, do you couple the hyd block in and out ports with a short hose?

With the loader installed, the PB from the loader valve goes back to the hyd block.

The OUT hose goes to the return.

The hyd block pressure OUT goes to the IN port of the loader valve.

 

[tcnjdeluca]

Hello,

I have really cleaned the quick connects with no luck the thing acts the same. Someone on another thread had a similar problem (different tractor) and cleaned the pressure bypass valve and it fixed it. I will try to do that soon, I need to get a socket big enough to remove it. All the lines run right from the pump to the valve. Their are three of them, I don't really know what is sending and what is a return. I am attaching pictures. I will need to get a pressure gauge i guess unless this clears up. Here are pictures of the pump and the valve to give people a better idea.

 

[J_J]

That block that has the three hoses coming out is a hyd block.

The pump feeds the hyd block and the hyd block probably feeds the loader valve.

The hyd block probably has a pressure port , a PB port, and an OUT/tank return port.

How do you connect the hoses when you remove the valve and loader?

Did you perhaps switch the input and PB hoses at one time?

You can test which port is the pressure feed port by placing that port hose in a bucket and see if fluid is flowing when you start the tractor.

Are there any markings on the hyd block or the loader valve? Do you have 6 or 7 hoses coming off the loader valve? Seven hoses indicate that you have a PB port.

 

[tcnjdeluca]

Ok I have messed around with it some more and can say that this thing totally acts differently with the loader attached vs not attached. So the hydraulics are working great, attach the lines. Still working great. Move the bucket, things still seem okay. Lift the loader --- things go haywire. They will stay this way, but if I put the bucket down take off the lines to the bucket, the steering and 3 point return to normal. So there is something when I lift the bucket that messes it up. So that basically three things.

What do you think;

1. Something wrong with loader, its lines or one of the cylinders.
2. Something wrong with valve (this stays on tractor when I take the loader off)
3. Something wrong with one of the quick connects -- even though to my best knowledge they are working.

Guesses? How would I check? I am convinced it one of the three things listed.