I tried without the counter balance valve but soon fitted it. The steering wheel in my case actually turned the opposite way to the front wheels and would soon make you dizzy. The additional valve was reasonably cheap so no dramas.
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During a conversation with another user I was pointed toward a cross-piloted double check valve to stop the reactive back-feeding, which would reduce cost even more. Have just ordered one to try, if it works youâll be seeing it on my shop soonâŚ
This sounds interesting keep us updated 
In the US a source for a simple double check valve like they are speaking of is Summit Hydraulics. Fairly small and simple.
Will this block work on a Fendt 900 TMS series (COM3)?
After a quick search it looks like what you are asking is if this can be used with the fendt vario active steering turned on.
I would need to verify the exact model and search the matching hydraulics service section but from what I found it appears fendt uses an electric pwm solenoid valve to increase or decrease the flow going into the steering orbital.
In this situation, you would want to connect the valve to the main system pressure and not the controlled flow out to the orbital. This way the supply is constant and not varying. I donât think most steering controllers can deal with changing supply flow rates. By pulling pressure from the main system, an autosteer controller should calibrate and operate just fine.
That or the other choice would be to go ahead and tap into the steering pressure supply but turn the Varioactive steering off in the tractor system controls.
I should be more specific: on an OC Valtra with priority valve to give a CC steering system the LS must be able to bled through the valve.
Here is my test with an SP10-57C:
@jhent what is the purpose of this check valve (out of port 1)? I would say itâs not needed
Would that be recommanded/approuved by the valve manufacturer? I canât figure out how this would work. And I would never modify a steering system without understanding every element on it.
In the diagram on the hydraforce schematic that was used it shows up on the drawing. It is an optional add on orafice check that can be placed just under the actual sp10-58c cart.
It is not figured in but we did get a price from a hydraforce distributor for it. It doesnât need to be there and the first ones we made did not have one of those checks and they work great on our tractors.
The sp10-58c drains the load sense from its own line when in the neutral position.
The valve design we made has check cartridges when used with another load sense input.
For a Valtra with a load sense activated priority valve and open center main supply, yes our valve will work.
The existing load sense from the orbital can go into LSIN and then LSOUT will go to the priority valve on the tractor. Scroll up to the diagram I posted labeled âHybrid system open center with load sense priorityâ.
Good to know. Yes then an SP10-58 will work on the Valtras, mounted parallel to the orbitrol.
This is exactly how I mount them, without the compensator.
All ports are rated for full pressure and flow in both directions, so yes.
If you have an OC tractor though, itâs probably best to use the OC variant of the valve, and leave the orbitalâs priority valve untouched
Any updates on valves?
They should be letting us know soon as to when the manifold blocks will ship to us. Honestly Iâd expect to hear something this week or next at the latest. I can check with the machine shop and see where they are.
Machine shop sent email saying they are done and awaiting final inspection before shipping. Sent this image.
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preliminary owners manual
We have the blocks but still need to see the tariff charges before we can set a fixed price. We are ordering several full sets of valve components but it seems like 9 weeks lead time is the best to get everything from the Hydraforce distributor.
Very nice instruction document. One question I have is for the PSST port steer sensor that would shut off autosteer there is no reference # for a steering sensor. Would it be possible to provide a part number like the other valves?
Edit: looking into at least the AgOpengps files, it looks like only milliamp type is needed. I will look into sourcing some and see what the costs are.
Different steering controllers use different return signal types. We could list some but the user needs to identify what type their controller will need.
Danfoss, Ashcroft, WIKA, and some.others make sensors.
Danfoss makes a sensor model that has the SAE #4 size threads and comes in different types.
Sensor types.
First two use power ground and signal pins.
Voltage: normally +12v supply and 1-5 or 0-5 volt return signal
Ratiometric: +5volt supply and 0.5-4.5 volt signal.
MilliAmp: can be 12 volt supply and uses return wire only (only uses 2 wires) range 0-20 mAmp value.
Or some might use an adjustable pressure switch. One example was some of Raven systems where used a special off-on pressure switch with a adjustment knob on it.
The AiO work with 4-20ma, 1-5V and 0-5V sensors.
A 4-20ma sensor output a 1-5V signal by simply adding a resistor in the circuit.
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Thats good to know. I have a good price on a batch of new in box 1-5volt Danfoss sensors.
Did you get a chance to try that cross piloted double check valve? I just installed one of your valves on a Case 2590 and the steering wheel turns the opposite direction of the wheels. Or would a counterbalance valve be better?
I installed double check valve last week. It work fine. Wheels turning opposite direction is wrong connection in lines.
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