This channel is pure gold. Really decent stuff

Really happy to see this video. I have been arguing with workmates over years who always blame cylinder when they are creeping. Simply barrel has no more space to accommodate rod's volume unless oil escape through valves or rod wiper seal or head. Thanks buddy.

@mike93eh

2 жыл бұрын

BUT cant the rod extend out?? less volume drifting out

@bhstor0

2 жыл бұрын

It won't drift but it will be due to vacuum instead of higher pressure.

these are the some of the best videos i have seen on KZread. Please keep making more!!!!

@lunchboxsessions

7 жыл бұрын

Thanks - and don't worry, we're going to keep on making these videos! If you want to support us, just help spread the word.

@Engineerboy100

4 жыл бұрын

I have to agree, I'm a mechanical engineer and these videos are helping me understand a lot of things that were not fully explained in college .... gotta learn a lot of things on your own if you want to be good. :)

@victorrosero3206

2 жыл бұрын

@@lunchboxsessions Excelente video , podria decirme el nombre de el programa que usa y donde puedo comprarlo para fines educativos ,muchas gracias .

This is excellent! My bobcat has drift and this video would have saved me some time and money!

Love these videos, I'm learning so much, I'm binge watching lol thanks

Found my bobcat lift arm drift with this knowledge. The emergency arm release valve was leaking. Great videos!

@krish08111994

4 жыл бұрын

Are you able to elobrote the way you solved. Kindly need your support.

@simclardy1

3 жыл бұрын

@@krish08111994 I used an ultrasonic leak detector with a contact probe to listen for flow/ turbulence. I think you can use a simple mechanic stethoscope. it was my bobcat t190 2007 machine. next to the seat on the right you have an emergency release valve to lower the arms and that was leaking. cheers

I'm a mechanic in the mining industry and our continuous miner has this problem with the head drifting they have changed Jack's but it is a remote operated machine I think a lot of the drift in this machine comes from worn out solenoids in the controller mounted to the valve chest so be adjust on that this evening and I'll let yall know how that goes. Good video also thanks for the diagram

THANKS FOR UPLOADING THIS VIDEOS

Thank you so much sir, for this amazing video, you save my job

Did you post a cylinder drift in extension video?

Really helpful! I thought the piston rod will slide down all the way to the bottom once the piston seal was removed. The nice graphics and your clear explanation made me grasp the concept pretty easily.

@nathanares5233

2 жыл бұрын

You all prolly dont give a damn but does anyone know a trick to get back into an instagram account? I was stupid lost my password. I would appreciate any assistance you can offer me.

@charlessalvador7251

2 жыл бұрын

@Nathan Ares instablaster :)

@nathanares5233

2 жыл бұрын

@Charles Salvador I really appreciate your reply. I got to the site thru google and Im trying it out now. I see it takes quite some time so I will get back to you later with my results.

@nathanares5233

2 жыл бұрын

@Charles Salvador It did the trick and I now got access to my account again. I'm so happy:D Thank you so much, you saved my account!

@charlessalvador7251

2 жыл бұрын

@Nathan Ares you are welcome :)

Interesting. It is like trying to pull out the plunger of a syringe while your thumb is covering the air hole. Except the seal would be at the top, not against the cylinder walls. So for creep to occur, more oil must be able to get pulled into the cylinder.

Amazing videos, please keep making them. I have not been able to locate the other video on extension drift.

@MarceloMouraMG

7 жыл бұрын

I was looking for it as well. Will it be done?

Were is the video with cylinders drifting outward?

THANK YOU

System Designers might take note of the dangerous amplification of cylinder pressures accompanying that seal failure - since the cylinder pressure will now be set by the rod diameter, not the piston diameter OR the relief pressure. Possibly 3-5 times the cylinder pressure now evident, and over the entire canister. For machinery expected to support heavy loads, a factor of safety of 2-3 based on the rod diameter is a much larger cylinder. Add to that, a pressure relief device or any other device inside the valving will have to contend with 3-4x it's normal operating conditions, possibly leading to an uncommanded lowering, even, unexpectedly, via the rod-end port. No one saw that coming... :/

@ZacharyPiercy

2 жыл бұрын

Yes that’s a very important nugget of information that is easily glossed over from this situation, thanks for emphasizing it here.

I learnt something new.

Thnx bro

Sir what about 2nd condition you mentioned (hanging load)

What if the gland seal is leaking, but the piston seal is good? Or would a bad piston seal eventually stress the gland seal to failure?

Did you ever end up doing a video on cylinder drift in the retract direction? I ended up working on a telescoping forklift and with the machine shut off the boom would extend. This cylinder has holding valves so another test we did was capping the cylinder off completely and it would still drift out.

@bhstor0

2 жыл бұрын

I would suspect air is getting sucked into the cylinder. Pulling the rod out would create a vacuum.

Which software are you using for diagrams?

Sir what will happen if there dubble acting cylender is?

Excelente! aula muito obrigado.

How about proper testing procedure for piston seal by pass

I had an outrigger on a truck mounted crane system that would extend down just fine, but would go back up if I used any other controls. only one of the outriggers did this. Do you Have any insight as to what would cause this? im thinking a check valve of some sort

It would have been more pedagogic if it was orange color below the piston before you remove the piston seal and then change to red in the whole cylinder. That would better show that the pressure will (depending on piston rod and piston diameter) increase substantially in this situation when the seal starts leaking or is removed. Now we can se a slight increase on the lower gauge but changing colors would be even better.

Do you answer questions?

Can you suuggest me a handbook about hydravlic systems???? Thnaks

What application did you use to make this animated diagram sir

When will the site be opened to the public ?

@lunchboxsessions

8 жыл бұрын

We're planning on a full public launch later this fall. If you register at the website (www.lunchboxsessions.com) then we'll send you an email when the time comes. Cheers!

Hi everyone,,,,i want to ask what is the problem of my pc60u backhoe komatsu.the cylinder boom in bucket if you going (out) the rod ok,but if you shift to (IN) the rod the engine become to shout down or off,,,please help me,,,advance tnx

i thought for sure without the seal the piston would make its way down and the fluid below would make its way above the piston.

Good Video, I have a an issue with my main up/down cylinder on my Versalift Bucket van. When I toggle the cylinder up it goes up and when I toggle down it goes up. Everything in the tower checks out so far but I haven't done any troubleshooting on the cylinder since it wasn't visibly leaking . Could the internal seals be gone making it go up on both movements?

@krish08111994

4 жыл бұрын

Shall I Know how the solution happened

great video but you only simulated cylinder 1 what about cylinder 2 with a hanged load? will it be like the first cylinder or not.

@mikehawk4517

4 жыл бұрын

My guess is that it would be the same thing. The only difference is that the cylinder pressure would be at vacuum instead of high pressure.

@mike93eh

2 жыл бұрын

YES!!! that is the exact problem im having that i cant find any info on whatsoever!!

super

I have a cylinder at work that drifts back to extended.

Pumps concrete??

What simulation software is this??? It's amazing!!! 😮 {if it's not just an animation that is}

What is the name of a valve i can use to stop cylinder leak down if a hose breaks ..such as in a crane ?

@1pollo1rabbit

5 жыл бұрын

d man Holding valve or counterbalance valve.

Great video... Learned a lot....Can you tell simulation software U guys have used for this?

@lunchboxsessions

7 жыл бұрын

Hi Suprio. Our artists and programmers make these simulations from scratch. To learn more about Live Schematics, check out our company site: www.cdiginc.com/live-schematics

@AmanSharma-nw4ym

4 жыл бұрын

@@lunchboxsessions sir what will happen if there dubble acting cylender is?

Awesome; Even trained hydraulic Techs don't understand this.

Dear Sir............Example Problem I have a single acting hydraulic cylinder with a stroke of 300 mm, a bore of 18 mm and a rod of 10 mm if the press weight is 10 mm on the Piston Head what is the pressure.....Please explain the calculations

Just and counter balance valve

Your simulation is wrong. If no seal the piston will slowly drop down because the upper force still exist, but no static counterforce anymore.

@DeyanYakimov

4 жыл бұрын

It is not true. In order to dip more of the rod inside the cylinder, some oil need to evacuate. I am sure that if we start heating the cylinder the rod will even moves out in order to compensate expansion of the hydraulic oil. It will worth to see simulation like this.

@F47451

4 жыл бұрын

​@@DeyanYakimov If no seel an oil can move between top and bottom chambers can't it? Simulation works wrong because inside diameter of chamber and outside diameter of cylynder are set equal. In practice the piston is always slightly smaller.

@DeyanYakimov

4 жыл бұрын

@@F47451 If there is no seal oil can move, but only if the rod seal is also leaking. In order to push the cylinder in, you need more space inside to accomodate that part of the rod that is still outside - but the space is limited (oil cannot be compressed). If there is no rod, bud only piston it will slowly drop down. Watch the video once again carefully and you will understad.

@F47451

4 жыл бұрын

@@DeyanYakimov Yes you are right. I did not carefully watch the video. Thank you a lot!

@ericklascaibar9900

2 жыл бұрын

Why does the piston drop slight when the seals are removed? If F=PA and the area on the bottom of the piston is larger than the top, shouldn’t the force be moving up?

Good day Sir. I hope that you can help me for this hydraulic tilt problem.. The problem is the tilt Authomatic release the pressure.. What is the solution for that Sir.. Please give me idea to fixe this problem. Thank you.. God bless...

could you help with hydraulic power pack circuit working

@lunchboxsessions

7 жыл бұрын

Is there a specific feature on your power pack circuit that you are curious about? Does it have a fixed displacement or variable displacement pump?

@SuperSwapnil1990

7 жыл бұрын

hello sir , i want to know how pressure and flow are fixed on a rexroth hydraulic powerpack . it has an axial flow piston pump with 9 pistons.

@lunchboxsessions

7 жыл бұрын

Ah yes I understand. I recommend that you view our videos kzread.info/dash/bejne/nJd3qZiyetqXdrw.html and also kzread.info/dash/bejne/kZmZqs9-XceugM4.html These two videos cover the topics you are inquiring about. Most models of Rexroth, 9 piston axial pumps will be the same or very similar to what is described in these videos.

What is the name of this app?

@lunchboxsessions

5 жыл бұрын

See here: www.lunchboxsessions.com/help/what-software-do-you-use-to-make-the-simulations

Hi. From Baker Hughes =p

@lunchboxsessions

7 жыл бұрын

Great to hear from you Tengku!

🤝🤝🤝

I wish my professor taught us like this

This cannot be true, removing the piston oring sealing will make the piston rod "slowly" sink with equivalent velocity set by the clearance of the piston and cylinder inner diameter, due to the force F from the load.

Please remove that annoying soundtrack... it's distracting from the spoken words.

@lunchboxsessions

7 жыл бұрын

Thanks for the feedback. Most people barely notice that background sound, so it's helpful to get some feedback suggesting that it's too prominent. We're planning to revise how we do sound production, so you'll probably notice some improvements in our future videos. I hope that despite the sound, you're able to get some useful information out of our existing videos. Cheers.

Blah blah blah job blah read blah job blah school