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Discussion Starter #1
Hello,

I have a FEL(LA481) that won't hold it's tilt. When I fully curl the bucket back, it will slowly start to dump. Once it gets past a certain point it will dump rapidly. I think I have narrowed it down to a control valve(B00101) and not a cylinder issue. After swapping the hoses around on the control valve, I was no longer able to curl the bucket. The boom raise and lowering seem to be working fine. After looking at the parts diagram on Messicks, it looks like I might be able to rebuild or replace the seals on the valve rather than replacing the whole unit. Looking for some guidance on multiple fronts here guys, and eager to learn.

Will it fix my issue? Is this the issue?
How hard would the job be?
How do I know what seals or parts to replace for just the one malfunctioning
valve? Or Should I replace everything?

Pics
https://imgur.com/a/G39eibD



Parts diag- I think.
https://www.messicks.com/ku/85591?se...agramId=379157


Any help would be great.

I should note for clarification that I swapped the boom and bucket lines around first.

So, top left for top right, and bottom left for bottom right. This caused the boom to only lift. I had to loosen the bottom line to bleed fluid, and then it slowly lowered.

I went back to each line in its default spot, and then swapped the top left for the bottom left. This resulted in the bucket no longer being able to curl, but the boom started working correctly again. The issue seems to be on the left side lines. Just not sure if it is the top or bottom.

Thanks guys!
 

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it will be the crowd(curl)/dump ram seals that are leaking, or there is excessive wear between the spool and housing and that is most unlikely.

the control valve spools have an "O" ring at each end to stop the oil from leaking out from the spools and housing.

In your second photo I see the spool ends are exposed to the elements, I would advise you to get a set of boots and cover those, otherwise the constant covering in dirt and dust will be grinding the spool and the sealing "O" ring and eventually you may have to replace the whole control valve assembly.

and make sure you put the hoses back in there original locations.
 

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Discussion Starter #4
it will be the crowd(curl)/dump ram seals that are leaking, or there is excessive wear between the spool and housing and that is most unlikely.

the control valve spools have an "O" ring at each end to stop the oil from leaking out from the spools and housing.

In your second photo I see the spool ends are exposed to the elements, I would advise you to get a set of boots and cover those, otherwise the constant covering in dirt and dust will be grinding the spool and the sealing "O" ring and eventually you may have to replace the whole control valve assembly.

and make sure you put the hoses back in there original locations.
Are the ram seals the seals inside the cylinder? Also, why was i not able to the bucket when I swapped them, 1 for 3 and 2 for 4. Possibly I have two issues? I would think everything would work but just that I would raise and lower the bucket with what would normally be curl and dump?
 

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The fact you had to bleed a hose fitting to lower the boom tells me the return lines were not correctly hooked up to the control valve when you swapped them around.

You would know as oil is fed into one side of the ram, the oil on the other side of the piston has to be able to return through the control valve and back to storage, if the return lines are not correct, there will be a hydraulic lock in the system.
 
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