The operator is NOT rotating the outer spool sleeve OR the gerotor (7:10). The operator, by turning the inner spool of the control valve off neutral, causes the gerotor to be pressurized, which drives the gerotor as the oil is on its way to the output ports, which drives the central shaft, pinned to the outer spool, driving the outer spool to "catch up" with the inner part and re-center the leaf springs, redirecting flow from the gerotor to the tank port. The operator is ONLY moving the inner spool. Everything else is driven by hydraulic pressure. The only time operator input directly moves the outer sleeve or the gerotor is when there is no hydraulic pressure on the input port providing re-centering feedback. I CAN turn the steering on my tractor when there's no hydraulic pressure, but I try not to do it when there's any load on the wheels, because that DOES directly drive the outer spool and gerotor, which puts torque load on the leaf springs and the pins, which aren't designed for that kind of load.
Thanks for the video. Very good explanation. I just bought an old tractor with that system. The steering works, but is some kind of loose. If the engine is off I can turn a bit left and then I can quickly turn 1/4 of a turn right. This without actual moving the wheels. I can repeat this. During the quick right turn I can hear a "grinding" noise like teeth grinding from a manual gearbox. Any one who have an idea to what the cause can be?
These are such elegant and complicated components. It’s hard to believe how they came up with this idea back in the day. Thanks for helping me understand a bit better how they work
An excellent explanation, I was curious how these worked and this gave me all of the information I needed. (I had watched a system being fitted to a Off road vehicle and wondered how the valving followed the steering wheel position).
Thats the first video that mension the Caster angle and explains the steering have not restoretion torque. I never drived a machine with this system so it helps me a lot to understand how it works. Great video!!!
GREAT EXPLANS ATION SIR BUT SIR I M HAVING SOME CHALENGES WITH MY STEERING SYSTEMS WHENE YOU ARE STEERING IT TO BOTH LEFT AND RIGHT IT DROWS YOUR HANDS BACK PLEASE SIR CAN YOU EXPLAIN THAT PROBLEM TO ME
Would it function the same way if the pressure and return lines were reversed? The Eaton schematic shows pressure moving from the spool to the gerotor first, then to the cylinder, as you explained. But I wonder if the hydraulic flow would be the same if it moved to the cylinder first, then through the gerotor, as if the pressure and return lines were reversed. I ask because I’ll be experimenting with it in the near future. I have an application that requires me to use an adjustable relief valve and I’d like to put the relief valve in the relief valve port of the steering control valve. The only issue is that due to the design of the casting, an adjustable relief valve can’t be used unless the port would be heavily modified. Simply reversing the pressure and return lines would allow an adjustable relief valve to be used in the original port, saving me some machining, or excess hosing and componentry. I feel like I won’t know the answer to wether it will function with the lines reversed until I try it and see. Just thought I’d ask in case you might have an opinion. Good video. I’d love to know where the animations came from, and if there are different versions for the Eaton steering control valves with power beyond capabilities and other available integral relief, check, and anti cavitation valves that these units are available with.
Most probably because there isn't enough oil flow when you are not moving. Usually the oil pumps are operated by the engine (unless it's an electric vehicle). When you are standing still, the engine is idling and rotating the pump at very low rpm as well (hence less flow). You can easily check this. Keep the vehicle in neutral and press gas, and check if the steering is easier now. :)
![[Hydraulic Steering] Orbital Valve Rebuild and How it Works](http://i.ytimg.com/vi/kflK40LN2XI/mqdefault.jpg)
Awesome explanation!
The operator is NOT rotating the outer spool sleeve OR the gerotor (7:10). The operator, by turning the inner spool of the control valve off neutral, causes the gerotor to be pressurized, which drives the gerotor as the oil is on its way to the output ports, which drives the central shaft, pinned to the outer spool, driving the outer spool to "catch up" with the inner part and re-center the leaf springs, redirecting flow from the gerotor to the tank port. The operator is ONLY moving the inner spool. Everything else is driven by hydraulic pressure.
The only time operator input directly moves the outer sleeve or the gerotor is when there is no hydraulic pressure on the input port providing re-centering feedback. I CAN turn the steering on my tractor when there's no hydraulic pressure, but I try not to do it when there's any load on the wheels, because that DOES directly drive the outer spool and gerotor, which puts torque load on the leaf springs and the pins, which aren't designed for that kind of load.
Good one
Thanks for the video. Very good explanation.
I just bought an old tractor with that system. The steering works, but is some kind of loose. If the engine is off I can turn a bit left and then I can quickly turn 1/4 of a turn right. This without actual moving the wheels. I can repeat this. During the quick right turn I can hear a "grinding" noise like teeth grinding from a manual gearbox. Any one who have an idea to what the cause can be?
These are such elegant and complicated components. It’s hard to believe how they came up with this idea back in the day. Thanks for helping me understand a bit better how they work
An excellent explanation, I was curious how these worked and this gave me all of the information I needed. (I had watched a system being fitted to a Off road vehicle and wondered how the valving followed the steering wheel position).
Good job
Thats the first video that mension the Caster angle and explains the steering have not restoretion torque. I never drived a machine with this system so it helps me a lot to understand how it works. Great video!!!
Good explained I appreciated
Great explanation! :) thank you
I think most wheeled excavators are road legal (that's the point of their design) and they use this type of steering
GREAT EXPLANS ATION SIR BUT SIR I M HAVING SOME CHALENGES WITH MY STEERING SYSTEMS WHENE YOU ARE STEERING IT TO BOTH LEFT AND RIGHT IT DROWS YOUR HANDS BACK PLEASE SIR CAN YOU EXPLAIN THAT PROBLEM TO ME
Thank u for such a great explanation.
Very useful.
Nice movie, thank you! what is the software you use ? is it possible to get it?
Would it function the same way if the pressure and return lines were reversed? The Eaton schematic shows pressure moving from the spool to the gerotor first, then to the cylinder, as you explained. But I wonder if the hydraulic flow would be the same if it moved to the cylinder first, then through the gerotor, as if the pressure and return lines were reversed.
I ask because I’ll be experimenting with it in the near future. I have an application that requires me to use an adjustable relief valve and I’d like to put the relief valve in the relief valve port of the steering control valve. The only issue is that due to the design of the casting, an adjustable relief valve can’t be used unless the port would be heavily modified. Simply reversing the pressure and return lines would allow an adjustable relief valve to be used in the original port, saving me some machining, or excess hosing and componentry.
I feel like I won’t know the answer to wether it will function with the lines reversed until I try it and see. Just thought I’d ask in case you might have an opinion. Good video. I’d love to know where the animations came from, and if there are different versions for the Eaton steering control valves with power beyond capabilities and other available integral relief, check, and anti cavitation valves that these units are available with.
I'd think the top seal would blow out. I've never tried it
No have parts avilabele in india
godd explanation👍👍
How to time steer motor Ford 555c
thank you
Any idea what would cause the steering hard to turn until you start moving ?
Most probably because there isn't enough oil flow when you are not moving. Usually the oil pumps are operated by the engine (unless it's an electric vehicle). When you are standing still, the engine is idling and rotating the pump at very low rpm as well (hence less flow). You can easily check this. Keep the vehicle in neutral and press gas, and check if the steering is easier now. :)
@A10bot I've done this, and it doesn't help the steering ram has a slight leak might not help
How steering comes to neutral position after extreme right or left ?
it doesn't. You have to manually steer it back straight
Ive always heard them called orbital valves
Orbitrol was one manufaturer's trademarked name I think. Like Kleenex.