[jstarnes]

Back into the reservoir probably.

it cant

thats the point it can only go from one side of the cylinder to the other through the valve (making the steering wheel spin on its way through)

so........




where can it go?







thats why I say it would lock up the steering when you try to turn sharply cause you cant stuff 44oz in to a space big enough for 32oz (only using those volumes for example)

 

[hybrid-theory]

i thought by putting in a ball valve, so the fliud would just curculate thru to each side, but imo its just not safe flat towing a rig, unless the rig thats pulling it has the weight and the brakes to safely stop both. yours being a fullsize blazer, you would need something much heavier than your blazer... like i said this is my opinion. my truck weighs around 5800lbs. and i first tried to pull it with a 1/2 ton truck, not smart i know, that truck weighed in at 5240lbs. and my rig would push it around the corners, almost everytime. i only did it three times with that truck, and i was surprised i made it back each time. sometimes when i would get to a stop sign, then try to turn right or left, my rig would not turn, causing the pull truck to just sit there spinning the tires.my friend would have to get in my rig, start it up so i could turn it. this being on pavement,made for some nasty burnouts. i tried it with my 2500hd, and it definitly pulled better(hd being heavier) but it would still push the ass end around, its just not worth if you need to drive on roads with other people. if some asshole stops quick your fawked.

 

[braxton357]

thats why I say it would lock up the steering when you try to turn sharply cause you cant stuff 44oz in to a space big enough for 32oz (only using those volumes for example)

"lock up" or just not allow it to turn all the way in one direction...? Having the front tires steer when flat towing really isn't necessary or wanted anyway. Think of how tow-dollys or tandem axle trailers work.

 

[rockwrangler]

Remove ONE bolt wire back the ram and TOW it get to where your going replace ONE bolt and off you go

 

[jstarnes]

"lock up" or just not allow it to turn all the way in one direction...? Having the front tires steer when flat towing really isn't necessary or wanted anyway. Think of how tow-dollys or tandem axle trailers work.

lock up is a bit harsh but I hope every one understands what I mean


which is that once the steering moves so far in one direction it will stop because a "single ended cylinder" has 2 sides to it one side will always have more volume area than the other the lesser side will pump oil into the greater side ok but the greater side will only pump the amount of oil it takes to fill the lesser side then it will stop with X amount of oil left over with nowhere to go


with a "double ended cylinder" the volume of each side is the same which means you can stroke the rod in and out swapping fluid from left to right with out any wories

 

[muddinmike]

I get it.

It was just an idea, your right though I dont think it will work too well.

fine then, put a ball valve on each line that both flow into the same resivor. I know you have a spare resivor doug :flipoff2:

 

[HaWiiLuVeR]

with a single ended ram, it would work just the same as the system does with the truck running and steering wheel giving input. with a single ended ram one side has larger volume (like you described above), so what you end up getting is more turns for the side that has more volume. (example) so you would have like 3 turns to the right, and 5 turns to the left. i dont see how it would differ on a flat tow.

 

[DougK20]

So, I got it hooked up tonight and tried 3 scenarios.

1. Truck turned off with ram attached and steering column unlocked. Turned easy to the left (which would be the cylinder's pressure stroke). But, was very difficult to turn back right and collapse the ram.

2. Started the truck and let idle while I turned both left and right. This time it turned left even easier, but it was still very tight trying to compress that cylinder back when turning right.

3. Disconnected the ram from the tie-rod and it worked perfectly. Tracked and turned awesome up to the 60mph I was able to do in my subdivision. Bolting it back up was only a matter of seconds. So, that's my story and I'm stickin' to it

Thanks for all your help!!!!

 

[Station]

So, I got it hooked up tonight and tried 3 scenarios.

1. Truck turned off with ram attached and steering column unlocked. Turned easy to the left (which would be the cylinder's pressure stroke). But, was very difficult to turn back right and collapse the ram.

2. Started the truck and let idle while I turned both left and right. This time it turned left even easier, but it was still very tight trying to compress that cylinder back when turning right.

3. Disconnected the ram from the tie-rod and it worked perfectly. Tracked and turned awesome up to the 60mph I was able to do in my subdivision. Bolting it back up was only a matter of seconds. So, that's my story and I'm stickin' to it

Thanks for all your help!!!!

I am glad that you found out a simple enough solution. Too bad that there just wasn't quite enough force to get it to work for you with the ram connected. Be careful though towing with nothing to stabilize the steering, as when you least expect it, it might try to find a way to get ugly on you.

Sean

 

[Station]

You care to post up a Hydraulic schematic of these valves you speak of?




or are you just gonna talk smack blindly with nothing to back you up?

the reason I ask is because the schematics I have seen say you COULD have a problem, and it MIGHT not track correctly due to the small amount of fluid that would have nowhere to go when the cylinder retracts which would lock up the cylinder which COULD blow the seals depending on what pressure the cylinder was built to handle

Granted in my scenario all the dots would have to connect for this to happen BUT it could happen

OK, so Dougs case shows that a reactive valve does indeed allow reaction with a single ended cylinder. The reason that the reaction was more stiff in one direction had nothing at all to do with any kind of hydro lock because of this being a differential volume cylinder. The only reason for the increased resistance in the one direction is because he was pushing against the bigger side of the piston in that direction , which means that at the pressure required to cause the geroter motor in the orbitrol valve to spin would take about 50% more force acting on the cylinder in that direction.

Thats the key to what you guys are not seeing with your claims of incompatability between load reaction and unbalanced cylinders. Regardless of whether you connect a balanced cylinder or an unbalanced cylinder to a load reactive orbitrol , when a great enough force is applied to the cylinder the gerotor is going to spin. When the geroter spins it opens up the working ports to the T port reguardless of whether the steering valve is in a neutral position or not(unlike the P port which requires input). When there is a positive or negative pressure between the working ports such as there is when running an unbalanced cylinder , this is compensated for by the opening to the T port.

The reason I wait this long to post this, and not post it with a diagram , is because I asked Danfoss engineers about this quite a while back, just to make sure that I was not doing anything without their reccomendation. They said , "NO PROBLEM" , and instead of answering all of my questions over the phone they answered them by sending me a Saur Danfoss technical bulletin that spoke specifically of this.

Well...... that was nearly 2 years ago, and I have moved in that time period. I can not find that technical bulletin with the diagram , so the other day I spoke with some Danfoss engineers again to see if they could send me that technical bulletin . They are very busy , and I have not heard back from them yet , but I am sure they will come though shortly.

Anyway... in the meantime I am being posted about in such a way as to be made to look an ass because of someones apparent personal grudge , and I can not wait for engineers in Denmark for "back up".

the schematics I have seen say you COULD have a problem, and it MIGHT not track correctly due to the small amount of fluid that would have nowhere to go when the cylinder retracts which would lock up the cylinder which COULD blow the seals depending on what pressure the cylinder was built to handle

Granted in my scenario all the dots would have to connect for this to happen BUT it could happen

Sorry but this is NOT a problem , a small ammount of fluid with nowhere to go ISN'T a reality , and it NEVER WILL cause you to "blow the seals" in a steering cylinder.

Sean
blind...

 

[jstarnes]

OK, so Dougs case shows that a reactive valve does indeed allow reaction with a single ended cylinder. The reason that the reaction was more stiff in one direction had nothing at all to do with any kind of hydro lock because of this being a differential volume cylinder. The only reason for the increased resistance in the one direction is because he was pushing against the bigger side of the piston in that direction , which means that at the pressure required to cause the geroter motor in the orbitrol valve to spin would take about 50% more force acting on the cylinder in that direction.

Thats the key to what you guys are not seeing with your claims of incompatability between load reaction and unbalanced cylinders. Regardless of whether you connect a balanced cylinder or an unbalanced cylinder to a load reactive orbitrol , when a great enough force is applied to the cylinder the gerotor is going to spin. When the geroter spins it opens up the working ports to the T port reguardless of whether the steering valve is in a neutral position or not(unlike the P port which requires input). When there is a positive or negative pressure between the working ports such as there is when running an unbalanced cylinder , this is compensated for by the opening to the T port.

The reason I wait this long to post this, and not post it with a diagram , is because I asked Danfoss engineers about this quite a while back, just to make sure that I was not doing anything without their reccomendation. They said , "NO PROBLEM" , and instead of answering all of my questions over the phone they answered them by sending me a Saur Danfoss technical bulletin that spoke specifically of this.

Well...... that was nearly 2 years ago, and I have moved in that time period. I can not find that technical bulletin with the diagram , so the other day I spoke with some Danfoss engineers again to see if they could send me that technical bulletin . They are very busy , and I have not heard back from them yet , but I am sure they will come though shortly.

Anyway... in the meantime I am being posted about in such a way as to be made to look an ass because of someones apparent personal grudge , and I can not wait for engineers in Denmark for "back up".



Sorry but this is NOT a problem , a small ammount of fluid with nowhere to go ISN'T a reality , and it NEVER WILL cause you to "blow the seals" in a steering cylinder.

Sean
blind...

math doesnt lie

you can do the volume calcs of the cylinder piston and rod side and see that there different and since they tie together through the orbitol there could be a problem

and if the valve opened to tank it would pump all the oil in the cylinder back to tank (path of least resistance) what would then hold the steering from flopping arround (with exception to KPI, and castor)

the valve in the orbitol is OC so the P is open to T the valve opens when you crack the centering springs untill then the work ports are tied together through the gerotor (in the case of the reactive) nothing from the cylinder can make it to tank unless you compress the springs that center the valve and alow it to

 

[DougK20]

Sean, what you said is exactly what I encountered. Yes, I am going to try and install a steering stabilizer on the opposite side for stability. It's a little loose in the bumps & ruts. Thanks to this thread for the idea

 

[Station]

math doesnt lie

you can do the volume calcs of the cylinder piston and rod side and see that there different and since they tie together through the orbitol there could be a problem

Absolutely , math does not lie , but it is things that you have said like this...

lock up is a bit harsh but I hope every one understands what I mean


which is that once the steering moves so far in one direction it will stop because a "single ended cylinder" has 2 sides to it one side will always have more volume area than the other the lesser side will pump oil into the greater side ok but the greater side will only pump the amount of oil it takes to fill the lesser side then it will stop with X amount of oil left over with nowhere to go

... that make me think that you are missing some numbers.
I know that neither I nor physics know what you mean here... Please explain to me how a differential displacement cylinder , filled with fluid, and with the ports plumbed straight to one another ( As you say is the case in the orbitrol) would be any other thing than locked up? It would be hydrolocked and you would not be able to move it even the first 1/8" in either direction . How could the cylinder possibly work " ok " in one direction? In a closed enviroment the vacuum created by a larger volume trying to draw from a smaller volume would create an instant vacuum that would be just as powerful in keeping the cylinder from moving as the pressure created in the opposite load direction.

and if the valve opened to tank it would pump all the oil in the cylinder back to tank (path of least resistance) what would then hold the steering from flopping arround (with exception to KPI, and castor)

Dude.....come on , you need to cool your head down a bit before your next retort, because I know you are smarter than this. You don't think that the suction caused by the extending side of the cylinder would be the path of least resistance?

the valve in the orbitol is OC so the P is open to T the valve opens when you crack the centering springs untill then the work ports are tied together through the gerotor (in the case of the reactive) nothing from the cylinder can make it to tank unless you compress the springs that center the valve and alow it to

We have already had a first hand account by someone impartial to our disagreement here give us an account of the steering cylinder being able to travel through it's stroke with the orbitrol valve in a neutral condtion. You should already know that you are wrong; you don't know why , but yet you insist on arguing.

Obviously nothing I could say would go anywhere with you, so mentioning to you that I have only done about ~70 rigs this way without issue , and that before doing any customers rigs I conducted some of my own tests to see what happens. The result was that I was able to extend and retract and extend the cylinder by hand pushing on the tires off the ground, but that wouldn't mean anything to you.

I have told you that I have spoken to Danfoss engineers myself , apparently you don't believe me.

You and the competition can believe that this does not work all you want to , but I won't be the blind one.

Sean

 

[Tim84K10]

I'm still wondering if what I'm seeing is a Chevy with a stock tie rod, and a ram mounted in single shear on the stock steering stabilizer mounts. That's a pretty shaky way to mount it IMO.

 

[DougK20]

I'm still wondering if what I'm seeing is a Chevy with a stock tie rod, and a ram mounted in single shear on the stock steering stabilizer mounts. That's a pretty shaky way to mount it IMO.

Good observation... Though, the tie-rod has since been sleeved in angle-iron and the 3/4" grade 8 single sheer works great for the moderate trails my rig can handle. I'll be able to justify a nicer tie-rod setup (double-ended ram!) once I upgrade to a Dana 60. The ram axle tube mount design was changed and strengthened as well.

Thanks for the replies about my towing query! No other forum even had a clue :shaking:

 

[Station]

Good observation... Though, the tie-rod has since been sleeved in angle-iron and the 3/4" grade 8 single sheer works great for the moderate trails my rig can handle. I'll be able to justify a nicer tie-rod setup (double-ended ram!) once I upgrade to a Dana 60. The ram axle tube mount design was changed and strengthened as well.

Thanks for the replies about my towing query! No other forum even had a clue :shaking:

Sorry you had to wade through all the BS. When you are ready to go the next step with that hydro steer setup , please give me a call, as Howe is not the only option. Going to a double ended ram probably does not cost as much as you think(Used to Howe prices).

Sean

 

[DougK20]

please give me a call, as Howe is not the only option. Going to a double ended ram probably does not cost as much as you think, Sean

Thanks! I'll keep ya in mind. I would have done so originally, except I got the ram and steering unit used. :smokin:

 

[Gordon]

Anyway... in the meantime I am being posted about in such a way as to be made to look an ass because of someones apparent personal grudge , and I can not wait for engineers in Denmark for "back up".
...

You don't look like an ass from here.

 

[jstarnes]

http://hydraulics.eaton.com/products/pdfs/C-STOV-MC001-E_part1.pdf page 11

 

[jstarnes]

http://www.parker.com/pumpmotor/cat/english/HY13-1560-002.pdf page 9


keep in mind the valve stays centered until it has user input (unless it has problems like a broken centering spring or contaminants stuck in between the spools)