Warning about tweaking the 419 FEL: John Deere Review  -- John Deere Tractors Discussion Forum and Review Warning about tweaking the 419 FEL: John Deere Review -- John Deere Tractors Discussion Forum

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 01-11-2005, 01:41 Post: 103964
tomrscott



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 Warning about tweaking the 419 FEL

A service tech at a local JD dealer, a guy that has been pretty helpful, while we were talking about the loader, happened to mention to be careful when lifting something heavy, especially trying to get something unstuck, that it is important to get a straight bite on the object so that the left and right arms lift approximately equally.

He said he has seen a couple 419's come in with a permanent twist in the loader frame from putting extreme uneven stress on it. He didn't really know exactly what the guy was doing when it got tweaked, but it may be worth being careful about. This is out of hundreds that this guy has probably seen, he has seen a couple, so it doesn't sound like a terribly chronic problem, but I respect the guy enough to pay attention.

He did say that one guy had tried to jack his 790 hydraulics up to something like 3800 psi and that was undoubtedly one of the ones that got bent.

This might be particularly worth paying attention to if you put in a pressure relief shim kit to raise the hydraulic presssure even to 2500.

For whatever it is worth, I'm going to be kind of careful about lopsided lifting. YMMV






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 01-11-2005, 08:36 Post: 103983
Murf



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 Warning about tweaking the 419 FEL

The other thing I have noticed is that very few FEL's come equipped with a flow divider/combiner.

This is a rather simple device which splits a hydraulic flow into two exact halves regardless of the load being unequal or not. On the FEL there are two lift cylinders, they are plumbed in parrallel, so the fluid is free to take the path of least resistance. That means if there is more weight on the left side of the bucket, the right hand cylinder will try to go up faster than the left, this is what twists the arms.

With a $100 valve in between the loader control valve and the cylinders this could not happen, the divider would limit the fluid going into the lighter loaded cylinder and hold it back to match the speed of the heavier loaded cylinder.

Instead manufacturers choose to depend on a slightly more robust construction to prevent this from happening, and in the average situation this does work.

The problem is when someone tries to over do it with an unbalnced load, such as lifting a heavy object from a hook mounted off to one side of the bucket.

Best of luck.






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