loader problems

Ben Noack · Mar 25, 2011

i have older du-al loader wen i raise the loader it works fine when i lower it one side comes down faster than the other binding the loader i replaced the lines for both sides for the lowering side of the cylinders now i stumped i checked all pins and they all spin fine when i turn them with channel locks any ideas what could cause this to happen

Bob · Mar 26, 2011

It's POSSIBLE the piston packings in one of the cylinders are damaged/unscrewed/fallen apart, or one of the cylinders is simply bent/binding.

Allan in NE · Mar 26, 2011

If it is indeed hydrolocking coming down, I sure think that you would want to replace the "lifting" hoses also as they are part of the circuit and just as important.

During the down direction, the (new) "lowering" hoses are under pressure and therefore, the oil on the other side of the cylinder packing now has to go someplace, so it dumps right back thru the valve to the tank via those "raising" hoses---the same way it came in.

If one of those raising hoses is internally torn, it could be blocking that return oil only.

It's been my experience that when a cylinder packing goes south, you'll usually see oil coming past that dust seal and leaking externally out of the cylinder.

Just a thought,

Allan

bison · Mar 26, 2011

Must be some piece of rubber in the return line blocking a port on the up or down stroke.Could be in the cylinder or anywhere there is a restriction all the way to the control valve

fixerupper · Mar 26, 2011

I think Bob has it pretty well nailed on the head. First thing that came to my mind was the packing nut unscrewed itself in one of the cylinders. Happens a lot with the older Du-als. It that is the problem, Baum Iron in Omaha has the seals. Put the nut back on with loc-Tite and it won't happen again. If you don't use Loc-Tite, it WILL happen again. Pulling the cylinders apart isn't rocket science.

To find out if this is the problem lower the loader way down and disconnect the lift hose from each cylinder. Then with those hoses disconnected, try to force the loader down just like you are normally lowering it. Just a bump or two on the hydraulic lever is all it takes. If oil shoots out of one of the cylinders through the hole that the hose was disconnected from without the cylinder moving, then the seals are leaking in that cylinder. It wouldn't hurt to lay a heavy rug or something like that over the cylinders so you don't shoot oil all over the place. It's a kind of a messy test, but you'll find out if you have a problem in this area real quick. Jim

Joe (Wa) · Mar 26, 2011

I have a loader like that, not as bad as yours but about drove me nutz. I did all the usual hose & valve things that are suggested here.

Finally I concluded the problem was internal. With the cyl fully extended, rod end disconnected, hoses off I was unable to push the rod more than a few inches by hand toward the retracted position. Hooked up the down press hose and retracted the rod, disconnected hose and then could only pull the rod out about mid travel before it stuck again.

The problem was the rod had a slight bow and was binding. With the loader fully raised both lift cyl rods appeared the same, straight as an arrow. The rod chrome had a narrow shadow of wear about 4" long on one side. I would not have noticed it if I hadn't measure the rod and known exactly where it was binding. Continued with repacking with a complete kit. Mounted it was exactly the same as before, no different whatever, still that way.

Joe (Wa) · Mar 26, 2011

Another thing to check, systems and spool valves often have a restrictor on the return side to eliminate the "hop" in lowering the bucket. I've installed adjustable & and nonadjustable restrictors and some valve manifolds have them internally, not always obvious.

loader problems

Ben Noack

New User

Bob

Well-known Member

Allan in NE

Well-known Member

bison

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fixerupper

Well-known Member

Joe (Wa)

Well-known Member

Joe (Wa)

Well-known Member

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