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Re----Still can't keep it up!!!!


 
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Jiles
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PostPosted: Sat May 19, 2007 6:24 pm    Post subject: Re----Still can't keep it up!!!! Reply to specific post Reply with quote

I posted earlier that I was having trouble keeping the front of my 480D Case off the ground. I have done all that was suggested but I still have the problem. When I am digging with the backhoe, with the bucket face down and the front of the machine off the ground, the front of the tractor will almost fall. As a test, I raised the front of the machine and pulled the stabelizer leaver back and when the cylinder bottoms out and the engine strains, the front of the machine will go down like it looses pressure. This does not make sense to me and I am stumped as what to do. The machine has plenty of power and will drag the whole machine while digging. Especially when the bucked bleeds off. I have to constantly lower the front bucket. Any more ideas would be appreciated.

 
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Ereck Dysfun
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PostPosted: Sun May 20, 2007 2:36 am    Post subject: Re: Re----Still can't keep it up!!!! Reply to specific post Reply with quote

Sounds kind of personal. However, they do make drugs that can assist you with your "problem"...

They're called tylenol, exedrine, and advil. For that headache you've gotten trying to figure this out!

Seriously tho, I don't have any experience with backhoes to be able to help. Sorry

 

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fordtractor2000
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PostPosted: Sun May 20, 2007 2:52 am    Post subject: Re: Re----Still can't keep it up!!!! Reply to specific post Reply with quote

why do you need the front of the machine off the ground when you dig ????? the " proper " way to dig with a backhoe is to put the front bucket on the ground with a little pressure, i.e. leave the wheels on the ground, then put the stabilizers down till they have a little weight on them , that is they way there designed, to have the widest most stable stance, but if it was me with the front bucket probelm you have i`d check for a bad check valve or bad cylinder packing...

 
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fordtractor2000
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PostPosted: Sun May 20, 2007 2:53 am    Post subject: Re: Re----Still can't keep it up!!!! Reply to specific post Reply with quote

why do you need the front of the machine off the ground when you dig ????? the " proper " way to dig with a backhoe is to put the front bucket on the ground with a little pressure, i.e. leave the wheels on the ground, then put the stabilizers down till they have a little weight on them , that is they way there designed, to have the widest most stable stance, but if it was me with the front bucket probelm you have i`d check for a bad check valve or bad cylinder packing...

 
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ben brown
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PostPosted: Sun May 20, 2007 3:10 am    Post subject: Re: Re----Still can't keep it up!!!! Reply to specific post Reply with quote

sounds to me like a control valve problem. most loadee back hoe have pressure oil coming to loader valve, then a line goes to the back hoe. most likly it is in the power beyond valve. oil comes to loader valve. two lines leave that valve. one is return oil from the loader valve. when you ues the loader the other line is what would be the power beyond going to backhoe valve, when you use you backhoe you forcing oil back in to loader valve making it raise the loader. probly only thing that can be done to fix is replace it. or live with it. pressure oil well go to the place of least restance.

 
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Ken L.
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PostPosted: Sun May 20, 2007 4:52 am    Post subject: Re: Re----Still can't keep it up!!!! Reply to specific post Reply with quote

Out of the 175+ that we have at work, not one operator raises the front wheels off the ground while using the backhoe. They raise the back wheels so that there is very little or no weight on the wheel. That's when you get the most stabillity. When you move the loader lever to raise and lower it, does it seem like there is a little too much freeplay in the lever? If so, the centering spring on the spool may have backed off. Under the right conditions, when there is a backpressure(like using the backhoe)it can force the spool to move thus, letting your front wheels drop to the ground. Not saying that's your problem but it could be.

 
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AJK
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PostPosted: Sun May 20, 2007 10:54 am    Post subject: Re: Re----Still can't keep it up!!!! Reply to specific post Reply with quote

You were on about that problem before,you found nothing wrong in the spool valve,do this test to determin where the trouble might be,have a look at the valve for the front loader,determin which spool is for the lift,you will see the two pipes coming off it,swop the pipes,now to lift the front of the machine off the ground you will have to pull the lever back,lift up the front and start digging with the hoe,if the front stays up it will mean that the cylinder are holding and that the problem is either the port valve or the bottom section of the spool,if it drops the same as it was doing it would point to the seals in the cylinders.
Good luck AJ

 
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Jiles
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PostPosted: Sun May 20, 2007 1:04 pm    Post subject: Re: Re----Still can't keep it up!!!! Reply to specific post Reply with quote

THANKS for All the replies. I am not a very experienced backhoe operator, but I do understand that there will be no more stability with the front or rear of the machine off the ground 10 inches or 2 inches. The higher you raise the machine the more dangerous the situation becomes. I raise the machine high because it constantly lowers with every dig cycle. If I don't raise the machine it will slide backwards. What I can't understand is that the front of the machine will stay in the air several hours with the machine stopped. With the design of the piston packing, this is normal. It does not have "lip" seals which are somewhat positive. As I stated, it is not just the backhoe, it will do the same thing if I bottom the stabelizer cylinders. I will tear the valve down again and see if I missed something. As stated, the up porton of the valve has to be getting fluid. I know that the hydraulic system on these machines are complicated and it just takes time and patience to locate the problem. I now have some fresh ideas and they are greatly appreciated. When-- WE-- find the problem I will let everyone know. The machine is usable but aggrevating.

 
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