Plumbing a TB One

[truckinfouble]

I have a Mahindra Force 105S I am adding a TB One hydraulic mower to. The mower requires 15 GPM to run and my machine claims 15.9 even though I know that is best case and I am more than likely a GPM or 2 under. Anyway, I know my machine can handle the mower, just trying to set up the hydraulic to flow as best as possible.
TB One manufacturer says to use 1/2" supply from rear remote and a 5/8" return to tank. I am guessing this is so if supply is cut off the spinning blades and motor dump the fluid to tank then spin down with no fluid pressure? I dont like this idea much and wonder if adding a one way valve between my supply and return or cushion valve would be a better option? Also, if I used a cushion or check valve, would I then be able to just use both ports on my remotes? This way when the mower is turned off it spins down and fluid stays in the motor in a loop from supply hose and return via check or cushion valve.
Eventually I want a dedicated circuit for the mower with an electric over hydraulic on off valve and some way to slow down the blades when turned off without grenading the pump.

 

[oldnslo]

Yes you can plumb a one way ( check) valve for rundown or use a cross port relief set at a lower pressure for rundown. This will act like a brake and slow the blades quicker than a check will.

One item to check on the motor used is shaft seal pressure or back pressure capability. You may have to test the return pressure at flow to verify that going through the ports in on your remote valves is not higher than motor rating.

 

[truckinfouble]

I am really looking at the Cross Port Relief. The issue I am having is the manufacturer says use 5/8 supply and return at no more than 15 GPM. The Eaton motor, 101-1749-009, on it isn't supposed to go more than 10 GPM per Eaton website. It also uses #10 or 1/2" NPT fittings depending on which site you get the specs from.
I am thinking with the 10 GPM flow max and port size, I may be better off using 1/2" hoses and connections with my 15.9 GPM machine. Can anyone possibly add some expertise to my assumptions? Also, with the cross port relief, I am looking at one on Surplus Center that is 1/2" in and out with a 1500-3000 psi range. They offer a lower pressure range but didnt think i should go lower than 1500.

 

[5030]

I think you will be disapointed. Your flow is total GPM flow. Not available flow.

 

[truckinfouble]

Why disappointed? There are 2 pumps on my machine, one for steering the other for attachments. The one for attachments is rated at 15.9 which as I said before I am sure is lower. Either way, my machine is bigger and has more flow than the ones this attachment was made for. I am using it to mow grass in ditches and trim small new growth branches over driveways as it was designed for. I will not use it for clearing land or underbrushing. If I wanted that I would go with Baumalight or Fecon rear mount PTO mulchers. I just dont want to blow a seal on the mower and asked for guidance from the more experienced guys since my machine has more than is needed.

 

[oldnslo]

Truckin
Like 5030 I question the 15.9 GPM being available at the remotes.

I would suggest verifying what the flow to the remotes is before purchasing a mower.

If true 15.9 GPM you will need a larger displacement motor to keep the RPMs down.

Running smaller 1/2 inch hose will NOT reduce flow. It will just create more heat and make your system less efficient.

 

[truckinfouble]

Ok. I do also agree with both that the flow is less than 15.9, I even said that at the beginning. I am here to learn so your explanation of the smaller hose creating more heat makes sence and is something I didn't think of. I can do 3/4 or special order the 5/8 but wanted to try to understand how the various sizes and flows would effect this attachment. Thank you both for your input and hope I didn't sound rude in earlier reply, I am genuinely trying to learn the more in depth side of hydraulic systems.
I was a track vehicle repairer in the Army and had a 3 week block on Hydraulics but it was basic to say the least with a lot of time spent on troubleshooting and not the more technical side of flow and design.
I also agree a different motor may be needed and will address that with the dealer since he knew what I had and swore it would work fine. Even said use 1/2" hose which I questioned at the beginning.

 

[100 td]

If this is your tractor, clicking the SPECIFICATION tab on this page shows 11.2 GPM
217 Mahindra 557 4WD Shuttle | Steel Horses

 

[truckinfouble]

No. I traded the 5570 in for an MForce 105s in June.

 

[100 td]

OK, so you have now updated your info, I went off that info so previous comment not relevant, I should have gone back and reread the post info.