Top Link ?

[SylvainG]

Top link cylinders on sale now at princess auto

https://www.princessauto.com/en/top-link-cylinders/product/PA1000000426?skuId=8699449

Mine doesn't have the check valve - drift doesn't seem to be a problem.

Yep, that's the one I bought, awaiting (free) delivery.

 

[Tinhack]

Annually no, for a given outside force on a cylinder, the larger cylinder will see a lower pressure.
Its the same principle are how a larger cylinder will exert more force then a smaller cylinder at a given pressure, but inverse.

You're thinking backwards as in normal cylinder function. (PSI x Cylinder Area = Force). A larger cylinder WILL provide more Force at the same PSI in the normal function. This situation is not normal cylinder function. It's reversed.

When dragging implements it's: Force x Cylinder Area = PSI

Now, go back to your chair and think about it. This class is over.

 

[TMGT]

You're thinking backwards as in normal cylinder function. (PSI x Cylinder Area = Force). A larger cylinder WILL provide more Force at the same PSI in the normal function. This situation is not normal cylinder function. It's reversed.

When dragging implements it's: Force x Cylinder Area = PSI

Now, go back to your chair and think about it. This class is over.

Might want to check your math.

It's Force÷Cylinder Area=PSI

 

[SylvainG]

Thinking out loud here and lets exaggerate the size to show more precisely. Won't a 10 m2 piston moving 1 mm create more pressure in a 1 cm hose connected to it than a 1 m2 piston moving also 1 mm? Much more fluid wants to move on the first example than the second.

 

[ptsg]

Thinking out loud here and lets exaggerate the size to show more precisely. Won't a 10 m2 piston moving 1 mm create more pressure in a 1 cm hose connected to it than a 1 m2 piston moving also 1 mm? Much more fluid wants to move on the first example than the second.

Well, that can make sense for about 94.7% of the world but you know, those guys in the States are still stuck in inches...

 

[_RaT_]

Yep, that's the one I bought, awaiting (free) delivery.

Make sure to measure your current top link retracted/extended lengths. My L3940 takes the 12". Many cylinders also have 2 or 2 1/2" pistons to choose from.

 

[LD1]

You're thinking backwards as in normal cylinder function. (PSI x Cylinder Area = Force). A larger cylinder WILL provide more Force at the same PSI in the normal function. This situation is not normal cylinder function. It's reversed.

When dragging implements it's: Force x Cylinder Area = PSI

Now, go back to your chair and think about it. This class is over.

Might want to consider deleting or editing this very incorrect information.

This is how people continue to spew mis-information....because they "read it somehwere on the internet".

You are wrong.....and contributing to further confusion in this thread. Do us all the favor and delete both your posts if you dont want to discuss it like adults and perhaps learn something. Ya know.....being cocky is only great if you are actually right

 

[LD1]

Thinking out loud here and lets exaggerate the size to show more precisely. Won't a 10 m2 piston moving 1 mm create more pressure in a 1 cm hose connected to it than a 1 m2 piston moving also 1 mm? Much more fluid wants to move on the first example than the second.

YES, it will move more fluid. But thats not the scenerio. The fluid is contained within the cylinder and hoses.....and cannot move unless the valve is opened....or the hose blows. Exerting force back on the cylinder.....the larger cylinder has greater area to distribute the load....therefore the force PER SQUARE INCH is smaller.....since there are MORE square inches to share the load.

Ever wonder how a little wrist action on a grease gun can generate 10000 psi of pressure with very little outside force? Its because the piston/plunger is tiny. Same way with bottle jacks, floor jacks, etc. Using your logic.....if you had a huge piston moving ALOT of grease or oil....your little wrist action could generate more pressure. Think about that

 

[SylvainG]

But the thing is, it's liquid and the valve prevents the fluid from going anywhere so in the hose, pressure will be higher...

 

[SylvainG]

Make sure to measure your current top link retracted/extended lengths. My L3940 takes the 12". Many cylinders also have 2 or 2 1/2" pistons to choose from.

Already measured my top link fully retracted and fully extended. The hydraulic top link is the same size retracted and gives me one more inch extended.

 

[TMGT]

But the thing is, it's liquid and the valve prevents the fluid from going anywhere so in the hose, pressure will be higher...

The pressure of the fluid will be the same in the cylinder and the hose, the area of the hose is smaller therfore has lower "area" load(for lack of a better word).

This is why smaller diameter tubing can handle higher pressures at the same wall thickness.

 

[LD1]

But the thing is, it's liquid and the valve prevents the fluid from going anywhere so in the hose, pressure will be higher...

No. Your understanding isn't quite right.

P=pressure
A= area of the piston
F=force

P x A = F

Now solve the equation for P

F/A = P

The greater the area....the less pressure with a given force applied.

If you apply 1000 pounds of force trying to compress your toplink, and your piston area is 10sq in....you have 100psi.

Same 1000 pounds but your piston only has 1 sq in, you have 1000psi

What part of that do you don't understand so maybe I can better help

 

[SylvainG]

Ok I get it. Having more surface area reduces the pressure of the fluid internally. Using my example, it would mean the piston would 'try to displace' less fluid with its higher surface. A smaller surface having the same force applied to it you 'try to displace more fluid', creating more pressure in the fluid.

 

[_RaT_]

Already measured my top link fully retracted and fully extended. The hydraulic top link is the same size retracted and gives me one more inch extended.

So what length did you end up getting? Definitely a bonus to go extra on the extend length if that is an option. A top hydraulic link is priceless for a box scraper and a great asset for mowing.

 

[SylvainG]

This one. Hasn't arrived yet though...

https://www.princessauto.com/en/top-link-cylinders/product/PA1000000426?skuId=8699431

 

[_RaT_]

This one. Hasn't arrived yet though...

https://www.princessauto.com/en/top-link-cylinders/product/PA1000000426?skuId=8699431

 

[Tinhack]

No. Your understanding isn't quite right.

P=pressure
A= area of the piston
F=force

P x A = F

Now solve the equation for P

F/A = P

The greater the area....the less pressure with a given force applied.

If you apply 1000 pounds of force trying to compress your toplink, and your piston area is 10sq in....you have 100psi.

Same 1000 pounds but your piston only has 1 sq in, you have 1000psi

What part of that do you don't understand so maybe I can better help

I see the error of my ways now. My third grade math failed me.

I'm going back to my dozer again today and put this to the test.

I'll not delete my posts as they're quoted and I don't want to feel bullied. It's part of the learning process for all and to see an argument closed with evidence.

 

[LD1]

I see the error of my ways now. My third grade math failed me.

I'm going back to my dozer again today and put this to the test.

I'll not delete my posts as they're quoted and I don't want to feel bullied. It's part of the learning process for all and to see an argument closed with evidence.

Fair enough. No intent to make you feel bullied. The most important thing is that you now understand

Actually having and understanding of what is going on is far better than just repeating what others have told you without actually understanding the physics. Im glad you got a handle on it now.

 

[oosik]

After talking to Brian @ Fit Rite it was obvious I needed a Cat 2 top link. Cost more but has been absolutely fool proof for the time I've had it.

 

[Thunder chicken]

For those with hydraulic top links..... I see hooking up an implement could be a pain at times.... wrestling with a heavy cylinder, and if it’s not the ‘right length’ you can’t just screw it in/out, it’s a trip back around (into the cab to wiggle a lever) to adjust the length, hopefully just once! I guess it’s all good exercise! And what about hanging it when not in use? A new bracket of some sort must be in order?