MF GC2410 Front Loader Hydraulic Problem

[peterjd6]

After moving snow around for an hour or so my front end loader quit curling and dumping. It still operates up and down but doesn't dump. I do not see any signs of leaks and not real sure how to trouble shoot this issue. Any ideas?

 

[oldnslo]

I would first try to disconnect and then reconnect the quick disconnects for the curl circuit. if one of these is slightly unhooked the will stop all movement.

 

[LD1]

^^^^^^^^^^^^^Thats where I would start

 

[peterjd6]

I would first try to disconnect and then reconnect the quick disconnects for the curl circuit. if one of these is slightly unhooked the will stop all movement.

When I did a visual inspection checking for leaks they looked OK, but I will try your suggestion tomorrow and see what happens. I will let you know, thanks for the response.

 

[peterjd6]

I tried what you suggested and still have the same issue. So I then went back and disconnected and then re-connected all four hoses just to be sure they were all connected as they should be. Issues remains the same. Front loader goes up/down but no dumping action. Backhoe is unaffected - no problems there.

Any idea what I should try next?

 

[oldnslo]

Do either or both of the hoses going to the curl function appear to be pressurized when you move the joy stick?

Can you visually check all of the linkage between the joystick and the valve spool? Spool should move approximately the same distance as the raise lower spool.

 

[scdeerslayer]

Swap dump/curl with lift/lower and see if the problem follows.

 

[Snobdds]

Do you have the ability to test the pressure on the hydraulics to see if flow is making it to your front. Something like this from Ken's bolt on hooks or some home brew tester than can test up to 2500 psi will tell you everything you need to know.

 

[peterjd6]

Pardon my ignorance but I don't know what a value spool is and I forgot to look it up before I went to work on it today so I can't answer that question at the moment. I did swap dump/curl with lift/lower hoses and got the same results, that is the front loader still raises and lowers but doesn't dump or curl, which leads me to think the problem then lies somewhere after the connections not before. Would that be correct?

 

[oldnslo]

peterjd6,
Yes if the lift lower works on the curl circuit the problem is not in the valve.

Is the bucket fully curled or fully dumped at this time?

When moving the joystick does the bucket move at all? I.e. try to dump or try to curl..

If the bucket tries to move I would suspect one of the quick disconnect ends on the curl hoses is bad. Not a common problem but the ado occasionally fail.

 

[peterjd6]

The bucket is fully curled. When moving the joystick to dump/curl it is unresponsive, there is no joy.

When I switched the hoses there may have been minor false movement, or at least I thought so; but could have wishful thinking.

So if your suggestion is correct, I am guessing both the male/female part of the connection should be replaced.

 

[oldnslo]

If you put a load on the lip of the bucket does it move at all? I. e like trying to lift something with the bucket lip and trying to dump at the same time. This should eliminate the very slim chance that something in the loader linkage is stuck.

Can you tell if both hoses on the curl circuit get stiff while trying to dump? If yes this would indicate that the rod end line is being blocked and most likely cause would be a bad quick disconnect on the hose.

try feathering the control to dump very slowly. Occasionally a failing quick disconnect will allow a small flow but will fail (close) with a higher flow. A weak or broken spring in one half of a quick disconnect will allow flow in one direction but restrict or block flow in the other direction.

Just trying to help prove it is a bad disconnect before you spend the time and money to change them and the problem does not go away.

 

[peterjd6]

OK - went to supply store to get new quick disconnects. They only had one in stock that was the right size, and someone stole the female half out of the package! So I left with just the male adapter for $6.00 and just replaced the dump adapter on my tractor with the new part. The same problem still persist.

Tried picking up two cement blocks tied together and hooked to the lip of the bucket, still no dumping action. Can't tell if the hoses are still or not cause of the weather, still like 40 out so everything is pretty stiff, Mrs may have a different point of view.

So looks like I may need to order the rest of the parts online and wait till they show up to see if the problem is on the female side.....

 

[Pixguy]

OK - went to supply store to get new quick disconnects. They only had one in stock that was the right size, and someone stole the female half out of the package! So I left with just the male adapter for $6.00 and just replaced the dump adapter on my tractor with the new part. The same problem still persist. Tried picking up two cement blocks tied together and hooked to the lip of the bucket, still no dumping action. Can't tell if the hoses are still or not cause of the weather, still like 40 out so everything is pretty stiff, Mrs may have a different point of view. So looks like I may need to order the rest of the parts online and wait till they show up to see if the problem is on the female side.....

It's always the female's fault!

Geesh, I learned that in husband school.

 

[peterjd6]

Finally got a decent day to get back to working on my tractor. Was at a friend's house two nights ago and after explaining my issue he showed me his old Kubota which has the control valve exposed and is connected by cotter pins. He said sometimes the pins break. So I took mine apart to see if that was the issue, no pins and everything there looks fine.

Then I disconnected the lower HYD Hose upfront as suggested and the curl line shot out fluid but the dump line did not. At some point - not sure how this happened - the bucket did lower itself and then was able to curl back on command, but not dump. So obviously it's just the dump line that's the problem.

Then I went ahead and replaced the quick connector. Before I put the new one on, I tested to see if fluid would come out of the line where the new connector was going on. It did. After the new connector was in place the dump function still does not work and could not get fluid to come out of lower HYD hose.

So frustrated.

 

[aczlan]

Does it make a difference if you move the lever with the tractor off? If you move the lever to all positions with the tractor off, can you push in on the center pin on all 8 connectors?

Aaron Z

 

[peterjd6]

I do not think it makes a difference if I move the lever with the tractor off. The only real response I get is the bucket will drop if it was left in a raised position before being shut off. Not sure what you mean by "pushing in on the center pin on all 8 connectors?"......

 

[aczlan]

I do not think it makes a difference if I move the lever with the tractor off. The only real response I get is the bucket will drop if it was left in a raised position before being shut off. Not sure what you mean by "pushing in on the center pin on all 8 connectors?"......

The reason I ask is that it can build up pressure behind the quick connect and not let the quick connects open up. Moving the lever with the tractor off will relieve that pressure and allow the quick connect to open up.
If you cannot push the center "pin" in, the quick connect will not open and let fluid pass through.
On our machines, I have had to loosen a fitting to relieve the pressure on the loader hoses because there was enough pressure in the hose that the quick connect wouldn't open up and I had similar symptoms to what you are seeing.

Aaron Z

 

[peterjd6]

OK, now I understand the point about pushing in the pins, I will try that today.

 

[427cjackson]

Have you had any luck with this issue? Be careful if you push on the pin of the quick-disconnect...there could pressure behind it. If you were able to reconnect the QD fitting then there's no pressure built-up behind it...in my limited experience, they're impossible to reconnect when under pressure.

If you had disconnected both ends of the cylinder, fluid should have pushed out one hose when you operated the dump control.