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Tractor Talk Discussion Forum

need help on LX665 NH skid loader

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casered

06-20-2005 21:25:50




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Hey guys I am doing some maintenance work on our skid loader and I have a question. First let me explain the problem. When you operate the machine the bucket will tilt forward on its own. It will do it whether there is a load on it or not. In other words if I am just driving it from one spot on the farm to another it will start tilting forward . It has gotten pretty bad as of late. If it is tilted back against within about ten seconds it will be tilted forward at least an inch worth of cylinder stroke.

I was told by a NH dealer that if I took the lines off one of the tilt cylinders and put pressure to the other side if it leaked it would be the cylinder packing. So I tried that today. With the tilt rolled all the way back I took the hose off the head end of one of the tilt cylinders and put pressure on it by holding on the valve to put pressure on the rod end and see if I had leakage past the packing. What I found has me confused.

When pressure is applied to the rod end of the cylinder with the hose off of the head end I get no oil bypassing the packing and coming out of the hose fitting. Instead I get oil coming out of the hose that is off, under pressure and in large quantities. The only thing that I can figure to explain this is a leaking valve body. In my mind in an open center system when pressure is applied to one end of a cylinder the hose that is on the other end should not get oil coming out of it.

What am I missing here? Is it leaking past the spool from one work port to the other work port? Did I just not do something right? I sat and looked at the thing for a while and I cannot figure out what it is. I am sure it would be quite costly to take and have fixed at a dealer and if I know where to look I am sure I can fix it on my own.

Sorry for the long post, but I am at a loss. Anybody out there that can help me?

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RickB

06-21-2005 03:08:10




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 Re: need help on LX665 NH skid loader in reply to casered, 06-20-2005 21:25:50  
If you only took the fitting off one cylinder, the oil is probably bypassing the opposite cylinder piston and passing through the T to the hose you disconnected. Remove the same hose from both cylinders and re-test; or just re-pack both cylinders and be done with it. They have identical numbers of cycles. Or do one now and one next week..... .....



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casered

06-21-2005 04:21:55




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 Re: need help on LX665 NH skid loader in reply to RickB, 06-21-2005 03:08:10  
I guess I should have mentioned some more things and forgot. I did break the line on both cylinders and got the same result on each one. Besides the first line I broke was coming from the valve body and was after the T to the other cylinder so the oil in that line was coming from the valve and not the cylinders. I would just repack the cylinders if I was sure that was it. But if that doesnt cure the problem then it was a waste of $60 and I would still have the problem.

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RickB

06-21-2005 15:20:12




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 Re: need help on LX665 NH skid loader in reply to casered, 06-21-2005 04:21:55  
With everything connected, fill the bucket halfway and curl it most but not all the way back. Discounting however fast it uncurls on its own, does it curl out faster for just a little bit when you stroke the valve to curl the bucket back? In other words, does it curl out before starting to curl back? If no, the load check in the valve are OK. The spool itself is metal to metal, chances of serious internal leakage there are slim. It is an almost sure bet the cylinders need packing. If you think $120 is a lot, go price a loader control valve. That is the unlikely alternative. You could do the test the dealer suggested, just cap the hoses leading back to the valve.

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casered

06-21-2005 16:44:50




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 Re: need help on LX665 NH skid loader in reply to RickB, 06-21-2005 15:20:12  
You mentioned the load checks and I didnt think about them before. When you go to curl the bucket back if you just put a very small amount of foot pressure to the valve it will start to tilt forward instead of back. With more pressure applied it will start to curl back.

I hope my previous post did not sound sarcastic. After I typed it and posted it I thought maybe it did. I did not mean it to be if it came across that way.

I know what you are saying about the valve being much more costly then the packing. Not to mention you need to stand on you head to get in there at it. I just hate the thought of doing something that is unnecassary.

I think we will start at the cylinders though and rule them out. If they are not it at least they will be good to go for another couple thousand hours.

Thanks,

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