Setting hydraulic remote pressure

[City Farmer]

Hi all.
I'm adding 4 remotes to my New Holland 545 for a hyd. top link & 3 remotes for my Woods RB-750 BB. (Tilt,angle & offset) Unless someone tells me otherwise, this is the way I'm running it. Pump pressure to valve #1 (IN).....#1 PB to valve #2(IN).....#2 PB to 3pth. (Out) Low pressure fluid from both valves will return to the rear sump housing.

Now comes the pressure questions.
As long as the pressure in both valves is set Below the 3pt relief pressure, everything should be ok, right??? Does it matter which valve I feed first (higher relief pressure or lower)? The angle and offset cylinders require 1600 psi max. The manual doesn't say anything about the tilt pressure. I figure I'll set the tilt and top link about 150psi below the 3pt hitch pressure.

Andy

 

[oldnslo]

Your main relief should always be in the first valve. This is the only way to ensure that the pump is protected under all conditions. Setting the second valve relief lower will also limit any pressure down stream or this case your 3PH.

 

[City Farmer]

Your main relief should always be in the first valve. This is the only way to ensure that the pump is protected under all conditions. Setting the second valve relief lower will also limit any pressure down stream or this case your 3PH.

Thanks for the help.
Is there any way to get first valve pressure to the 3ph?
I connected the supply & return lines with a gauge tee'd in. Then, I chained down the lift arms. The pressure shot up to 1500psi or so. I'll have look in the book but I'm sure the relief is somewhere around 2150psi. I have to, I'll set both valves at the 3ph pressure and take my chances with the BB.

 

[farm boy00]

Thanks for the help.
Is there any way to get first valve pressure to the 3ph?
I connected the supply & return lines with a gauge tee'd in. Then, I chained down the lift arms. The pressure shot up to 1500psi or so. I'll have look in the book but I'm sure the relief is somewhere around 2150psi. I have to, I'll set both valves at the 3ph pressure and take my chances with the BB.

I think you could take and ad a few relief adjusters (don't think that's the correct name) on your lines going to your remotes or even on the attachment that will adjust the pressure

 

[LD1]

If your 3ph has an internal relief that is only set at 1500psi, the you can adjust your remote valve to 1500-1600 like you want with no adverse effects.

Loader is where you want good pressure. Valves downstream won't effect it. But I am surprised your 3ph isn't a higher pressure.

Normally, on modern CUT 's and UT's, pressure for bother loader and 3ph are both in the 2500psi range.

And in a case like that, there is no way to set a valve placed between the two at a lower pressure, without it effecting the 3ph.

 

[City Farmer]

If your 3ph has an internal relief that is only set at 1500psi, the you can adjust your remote valve to 1500-1600 like you want with no adverse effects.

Loader is where you want good pressure. Valves downstream won't effect it. But I am surprised your 3ph isn't a higher pressure.

Normally, on modern CUT 's and UT's, pressure for bother loader and 3ph are both in the 2500psi range.

And in a case like that, there is no way to set a valve placed between the two at a lower pressure, without it effecting the 3ph.

Tractor data says its 9.1 gpm @ 2450psi. I stopped at 1500psi before it went into relief. The chains started pinging. I broke a 3/8" chain binding down the 3ph a while back and haven't got'n a 1/2" yet.

 

[City Farmer]

I think you could take and ad a few relief adjusters (don't think that's the correct name) on your lines going to your remotes or even on the attachment that will adjust the pressure

Thanks. Good idea, I might have to go that route.

 

[LD1]

I think what farm boy was talking about are inline flow controls. And those will slow things down but wont relieve pressure.

If you want pressure relief on JUST the remotes and still have full power to the 3PH, You will have to have individual pressure relief valves on each one of the remotes. 1/2 NPT 16 GPM 1-25 PSI RELIEF VALVE

Which would get pricey, and each has to have a return to tank.

Why is your blade limited to 1600PSI? Most ag equipment meant for tractors is good for at least 2500 PSI??? As tractor remotes run system pressure which is normally 2400-2500psi.

If it were mine, I'd be looking at fixing the issue with the blade to allow full pressure, rather than make the changes to the tractor. What happens if you want to run some other attachment off a remote?? 1600psi would make anything else underpowered

 

[City Farmer]

I'm not worried about changing implements. Gotta have a tractor for every implement, right? :thumbsup: I think it's about as heavy duty as a BB you can get. It's 7' & weighs just over 1000lbs. I'll just going to run it at 2450psi and see how it goes.

 

[LD1]

Well if thats all you plan on using, put your gauge back on and see what it takes to lift it. If its less than 1600#, then set you remote valve relief to 1600#. Can still lift the BB and all is good.