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Old 4 Weeks Ago   #1
reclineaholic
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Default L355SS using remote hydraulics stops tractor

Over the winter i installed remote hydraulics on my L355SS. Installed a 4 spool valve with open center and power beyond, 2 spools are dedicated for tilt and top on the three point and the other 2 are for remotes. I tapped into the main pressure line from the hydraulic pump for the pressure and power beyond, and tapped into the pump suction line for the return. After I finished it I used a box blade to grade the driveway, just to try it out, and it all seemed to work perfect but now, 3 months later, I'm trying to use the same box blade to level a building site and something is wrong. If I use one of the spools for the top or tilt just a little everything is fine but if I move the spool valve full travel and use all the pump volume/pressure the hydraulic shuttle clutch disengages and tractor stops moving, when I release the spool the shuttle bangs back in hard and the tractor takes off again.

I'm wondering if this is a design error from the way I tapped into the hydraulics or if there is a check-valve on the shuttle clutch that's bad or maybe something wrong with the shuttle clutch? The shuttle clutch seems fine when used from the shuttle lever and it engages smoothly but when I use the remotes and it disengages, when it re-engages it bangs hard, so hard I'm afraid it will break something. For now until I get this figured out I have to stop the tractor to use the remotes.

I attached some pics of the install so maybe someone could figure out what I did wrong. Let me know if there's anything else you would like to see to help me fix this.
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Old 4 Weeks Ago   #2
North Idaho Wolfman

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Default Re: L355SS using remote hydraulics stops tractor

At first I thought : It sounds like you have either the PB and return swapped or the valve did not get the proper plug for the open center / return / PB.

But I dug in deeper and the issue most likely is your bypassing the pressure to the shuttle assembly, Via the return line.

You can run that valve without a PB and run the return back to where you have the PB now, this will create a pressure loop that will keep the shuttle under pressure all the time.
One thing that will not work when you do that, is a one way cylinder, there would be no pressure drop for it to release, but a 2 way cylinder will have no problems with this type of set up.
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Last edited by North Idaho Wolfman; 4 Weeks Ago at 08:24 AM.
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Old 4 Weeks Ago   #3
reclineaholic
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Default Re: L355SS using remote hydraulics stops tractor

Quote:
Originally Posted by North Idaho Wolfman View Post
At first I thought : It sounds like you have either the PB and return swapped or the valve did not get the proper plug for the open center / return / PB.

But I dug in deeper and the issue most likely is your bypassing the pressure to the shuttle assembly, Via the return line.

You can run that valve without a PB and run the return back to where you have the PB now, this will create a pressure loop that will keep the shuttle under pressure all the time.
One thing that will not work when you do that, is a one way cylinder, there would be no pressure drop for it to release, but a 2 way cylinder will have no problems with this type of set up.
Thanks for your reply. I think the 3 point and the shuttle clutch are both in the power beyond circuit, the 3 point is a single acting cylinder. Will that still work?
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Old 4 Weeks Ago   #4
North Idaho Wolfman

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Default Re: L355SS using remote hydraulics stops tractor

Ok, as L355SS schematics are a lot different that all the others, I had to dig and find it.
I have you a 100% fix.
You need to put the piping back how it was originally (besides you return tap) and tap in to the hydraulics on the OEM block for the added valve, this will move the added valve to be after the priority valve for the shuttle.
Here is the block to replace the original one.
http://www.tractorx.com/70050-00279-kubota-block-hyd



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Last edited by North Idaho Wolfman; 4 Weeks Ago at 09:44 AM.
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Old 4 Weeks Ago   #5
reclineaholic
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Default Re: L355SS using remote hydraulics stops tractor

Quote:
Originally Posted by North Idaho Wolfman View Post
Ok, as L355SS schematics are a lot different that all the others, I had to dig and find it.
I have you a 100% fix.
You need to put the piping back how it was originally (besides you return tap) and tap in to the hydraulics on the OEM block for the added valve, this will move the added valve to be after the priority valve for the shuttle.
Here is the block to replace the original one.
http://www.tractorx.com/70050-00279-kubota-block-hyd



That is awesome! Thank you sir!!!
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Old 4 Weeks Ago   #6
North Idaho Wolfman

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Default Re: L355SS using remote hydraulics stops tractor

Quote:
Originally Posted by reclineaholic View Post
That is awesome! Thank you sir!!!
Your welcome, please check back in after the change.
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Old 4 Weeks Ago   #7
reclineaholic
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Default Re: L355SS using remote hydraulics stops tractor

Quote:
Originally Posted by North Idaho Wolfman View Post
Your welcome, please check back in after the change.
I'll be sure to check back in but it may be a couple months before I can get to it because I'm beginning the process of building a new shop right now.
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Old 4 Weeks Ago   #8
Kennyd4110
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Default Re: L355SS using remote hydraulics stops tractor

Nice catch NIW :thumbsup:
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Old 4 Weeks Ago   #9
North Idaho Wolfman

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Default Re: L355SS using remote hydraulics stops tractor

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Nice catch NIW :thumbsup:
Thank you!
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Old 4 Weeks Ago   #10
North Idaho Wolfman

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Default Re: L355SS using remote hydraulics stops tractor

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Originally Posted by reclineaholic View Post
I'll be sure to check back in but it may be a couple months before I can get to it because I'm beginning the process of building a new shop right now.
No problem, I've been here since the summer of 2013 and everything willing will be here a lot longer!
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