How a hydraulic jack works

[@neffofrog]

I finally understand how a hydraulic jack works. Thank you very much. You are a great teacher!

[@eltunene]

Dear Neffo, thanks so much for your kind comment!!!

[@daytradeit6409]

There simply can't be a better explanation. Thanks!

[@eltunene]

Thanks a lot for your comment, Dmitriy!!!

[@coogeebear9123]

Very easy to understand. Excellent explanation. Thank you very much.

[@eltunene]

Thanks, Coogee Bear, for your kind comment!!!

[@arubaahmad4821]

WOW! I have learned so much and am thankful for this video! Now I know this machine inside out. Cannot wait to watch more of your vides! THANKYOU!!!

[@eltunene]

Thanks, Aruba, for your kind comment!! I invite you to watch my videos on solar energy!! It's amazing most people ignore this wonderful source of energy available to everyone at an incredibly low cost!! Please watch my playlists on solar energy!! Please find some of my green power clips at kzbin.info/www/bejne/jKSZhn2Khqt-mpo

[@venkatraman3635]

Will the jack work if it is placed horizonataly?

[@eltunene]

Dear Venkat, you would have to find the optimal position for gravity to fill up the small piston chamber, which could be somewhere with the lever pointing down or to one side. Otherwise the pump may not "suck" the oil from the reservoir. Cheers!!

[@Anonymous-it5jw]

Thanks. Adding the excellent visual explanation is very helpful.

[@eltunene]

Thanks for your kind comment!

[@eltunene]

Thanks for your kind comment!!!

[@ronfox5519]

This is an excellent explanation. Makes me want to check out the rest of your work. I hope you have something on calculating the thrust of screw jacks.

[@eltunene]

Thanks for your kind comment!!! There are some very interesting types of jacks. Scree jacks ate just an application of the inclined plane. The finer the thread, the longer the ramp and the higher the lifting ratio. One very interesting approach is the friction jack used in old VW jacks. I used to own an old beetle and it worked just fine! It used to lift both the front and the rear wheels on one side of the small thing. You can find an explanation on that on kzbin.info/www/bejne/nn2cn2Cegcqebac

[@ronfox5519]

@@eltunene I will check that out. I recently made a couple crude screw jacks out of nuts and bolts to get me out of a bind. It worked so well, I thought that i would try to calculate how much force I was generating. I skimmed through your channel for a minute. Looks very interesting. You are a man of many interests and abilities. I'm sure I'll be back to learn some new things.

[@bensartakamcas1n126]

This explanation is indeed useful you made me understand it in a simple and direct way I thank you good sir. Take care and God bless.

[@eltunene]

Thanks BensarT, for your kind comment!!!

[@sachinilakshika2213]

this is the exact explanation i was looking for! to the point and perfect!!! thank you

[@eltunene]

Thanks a lot, Sachini, for your kind comment!!

[@hauptuhrdotnetblog6700]

This is how I imagine Fidel Castro would sound if he was explaining hydraulic jacks to me.

[@MrMASess]

This is one of the funniest comments I read in a while. I can't get that scenario out of my head now. The narrator did a great job explaining the concept though.

[@joeperez5692]

😂 😂 only Fidel Castro wasn’t smart enough....although he will be explaining this like he is Bernoulli

[@orusmusic1511]

Hahaha fidel

[@Bruno00366]

@Hyperion 666 Is Spanish, not indian, don't you see the other videos in Spanish? Is an Mexican Engineer. He upload videos in Spanish/English

[@hipairbrush1053]

@Hyperion 666 He is speaking Spanish if they helps.

[@cloudgalaxy9231]

Dude, that's perfect!!! Thank you so much. Perfect explanation.

[@eltunene]

Hi, amigo, thanks a lot for your kind comment!!!

[@literoadie3502]

It works exactly like a air pump (like a bicycle pump) with the difference that the fluid (air is a fluid!) is oil instead of air. All of these pumps have two check-valves; the suction valve which draws fluid from the reservoir and builds pressure in the pump cylinder as the piston is pushed down, and the discharge valve which opens to let oil into the ram cylinder and then close shut to support the force on the ram.

[@eltunene]

That is exactly how it works!!!

[@carmendeliman4853]

Thank you for the exelent explanation and drawing

[@eltunene]

Thanks, Carmen, for your kind comment!!!😍

[@STFocus]

Very simple and clear. Thanks👏👏👏

[@eltunene]

Thanks, STFocus, for your kind comment!!!

[@ዮሐንስ-ቘ5ጘ]

This is marvelous. Thank you sir for the perfect Explanation

[@eltunene]

Thanks a lot for your kind comment!!!

[@syedhasan6548]

Nice Video Very informative Video Thanks

[@eltunene]

Thanks, Syed, for your kind comment!!!

[@lukesmith2725]

Great video. Well presented and explained. Thank you. Good visuals too.

[@eltunene]

Thanks, Luke!! I am glad you liked it!!

[@DevRaj-xq2ih]

I have a question. If I use one of these jacks to press something against the ceiling for example. And say I leave it like that for a long time. Then would it keep holding it there? Or would it decompress or leak?

[@agence0kaouther]

vaiment merci trés bien expliqué j'aimerais modifié ce verin pour faire descendre les poteaux en tube diametre 50 cad faire un mecanisme pour faciliter le travail des clotures sans taper avec le marteau j'ai fallit cassé mon doight merci

[@eltunene]

Je ne sais pas si un arrangement comme celui-ci peut fonctionner pour vous, je viens de le trouver sur KZbin. À votre santé!! kzbin.info/www/bejne/ZqKQcoeAgp2Yp6M

[@agence0kaouther]

@@eltunene vraiment merci beaucoup

[@usamalasharibaloch8365]

May I ask a question please?

[@eltunene]

Yes, of course, please go ahead

[@usamalasharibaloch8365]

@@eltunene is hydraulic system against law of conservation of energy? Bcz input force is multiplied amd we get output more than input..

[@Atkinsfan]

Very nice explanation. Thank you

[@eltunene]

Thanks, Atkinsfan, for your kind comment!!

[@christopherpetroff9882]

Nice graphics.

[@eltunene]

Thanks, Chris, I appreciate your kind comment!!! Regards!!!

[@Petr.S-g8u]

good video

[@eltunene]

Dear friend, thanks so much for your kind comment!!

[@EngDrawings]

I am an Egyptian engineer & designer and that is very good.

[@eltunene]

Thank you very much!!!

[@الفرعونالعاشق-ب8ر]

هلا ياباش مهندس

[@denzilsnaggs8683]

Question if we use the same jack extend the piston and reservoir would we be able to raise the jack and its load faster??? I want to build a lift but with out motor power hydraulics.

[@eltunene]

Dear Denzil, maybe I did not quite understand your question. A hydraulic jack works with a fluid, but basically the principle of force multiplication is the same as with a lever and a fulcrum. If the load end of the lever goes up say, an inch, and the opposite end has to be moved say, 10 inches, the effort is multiplied by ten, however, if you change that ratio in order to apply force for a shorter distance, and you are expecting the load end to move a longer distance, it will not work that way. If you extend the big piston's length (and of course the reservoir and the length of its cylinder) you'll have the capacity to lift your load for a longer distance, but will have to pump many times, which equates traveling a longer distance at the input. On the other hand, if your are talking about extending the length of the small piston, it will work, but of course, every pumping cycle has to be longer, which equates to pump several times; it will work, but you'll have to apply the same force for a longer distance. However, part of the force multiplication is due to the length of the lever linked to the small piston, since for every inch you move the small piston, you have to your end of that lever about 8 inches, you would have to modify the lever mechanism in order to take advantage of the original multiplication ratio of the lever itself.

[@sokhibabdurasulov3323]

What I don't understand is that as the pressure under A increases because of heavy weight it is lifting but how doesnt it reverse back the pressure when the valve is open to put more oil into it?

[@eltunene]

The valve is in fact opened by the pressure the small piston exerts upon the valve when the jack is being pumped. The pressure on the fluid is distributed evely (Pascal's principle) and exerts a pressure against the small piston too, but the pressure on the small piston is relatively small (psi), since the surface of the small piston is small compared to the surface of the big piston. It's a matter of pressure differences.

[@thetruth3322]

Thank you sir for this information. my mind was clogged until now.

[@eltunene]

Thanks, for your kind comment!!

[@johnvine5731]

Yeah. Fantastic explanation. Thanks.

[@eltunene]

Thanks, John Vine, for your kind comment!!!

[@Progamble]

The best explanation on KZbin. Very clear and simple. Excellent!

[@eltunene]

Thanks a lot!!!

[@petersonthattil9118]

The explanation is wrong. It is a function of pressure. The pressure remains the same across the surface. As the surface area increases the force increases. The force is multiplied by the ratio of the surface area of the small piston to that of big piston.

[@mauricobian]

@@petersonthattil9118 your correction isnt valid until you post your own video.

[@petersonthattil9118]

@@mauricobian It is sufficient for a seeker of knowledge. He finds solutions for himself and a small correction is sufficient. If someone is in doubt they can ask questions. I'll not bother to post a video on this subject.

[@mdhridoyr340]

nice video

[@NutsandBoltsAuto]

So a jack that doesnt work most likely has a bad check valve? Would you be able to fix it?

[@eltunene]

Any leak in the gaskets or in the valves can render a hydraulic jack useless. Normally an overhaul si in order for an old jack, replacing all wearable components, such as gaskets, o rings, and valves.

[@amiralclaude3376]

Good video

[@eltunene]

Thanks, Amiral, for your kind comment!!!

[@muhammadzubair4799]

Good explanation...

[@eltunene]

Thanks, Muhammad, for your kind comment!!!

[@subolpaul471]

Thank you for uploading this video. Its very much helpful.

[@eltunene]

Thanks, Subol, for your kind comment! Please watch my other videos. If you find green energy interesting, please watch my videos about solar power at kzbin.info/www/bejne/lXeuoWyVbrB3oc0

[@mightron]

assuming since it's high pressure, can't these explode?

[@eltunene]

If you try to lift excessive weight and apply too much force, it might develop leaks, something has got to give. Yes.

[@ulysses_grant]

Simply. Amazing. SUBSCRIBED!!

[@eltunene]

Thanks, Ulisses, for your kind comment!!!

[@ulysses_grant]

@@eltunene My honor to have a reply from you Sir. I believe you are an actual teacher that lectures in some school or University. Your students are blessed to have you as a mentor. God bless you and your work!

[@help2move]

very good

[@udayaranawaka1235]

Very clear explain, thank you.

[@eltunene]

Thanks for your kind comment!!!

[@yoko8077]

excellent video

[@eltunene]

Thanks, Yoko, for your kind comment!!!

[@JDHR35]

Wonderful video, these are the best types. Short and quick explanation.

[@eltunene]

Thank you very much!!!

[@ashokhuprikar8004]

Very good demo

[@eltunene]

Thanks!!

[@MrDhanesh2nair]

Who the hell disliked this useful explanation. Thankyou sir.

[@eltunene]

Thanks a lot, Dhanesh!!

[@johnarterberry5275]

There are 2 principles at work. One is the force multiplication due to the lever arm, and the second principle is a force multiplication due to the difference in piston diameters between the small and large piston. If 1000 pounds of force is generated on the small piston having a frontal area of 1 square inch, then the hydraulic pressure generated is 1000 psi (1000 pounds per square inch). Then if the 1000 psi fluid acts upon the larger piston of say 4 square inches of frontal area, then the force generated is 4000 pounds (a 2 ton jack).

[@CesarRamirez-hb1tt]

This Animation is great but would be even better if you can add color, particularly for the oil and show it moving through color. I’m sure that would help other people understand.

[@eltunene]

Thanks, Cesar, for your kind contribution. I'll keep that in mind for future videos, thanks a lot!!

[@m.b.smoshitoa8325]

hi CHAVA I THINK YOU CAN HELP ME. FEW MONTHS AGO I BOUGHT A NEW JACK. I ASKED MY SON TO LOWER IT AND HE UNSCREWED IT TO AN EXTEND THAT THE FLUID COME OUT. I THEN TRIED TO REFILL IT AND IT NEVER CAME BACK TO LIFE. AND THEN YERSTERDAY I BOUGHT NEW 20 TON JACK. AND MY ASSISTAND DIDTHE SAME. THAT IT HOW I STARTED SERCHING ABOUT JACKS ON INTERNET. THIS IS WHAT I TRIED TO DO : I UNSCREWED IT COMPLETELY AS IT WAS ALREADY NOT WORKING.I THEN TRIED TO FILL OIL THROUGH THAT HOLE. NOTHING CAME RIGHT. I TRIED SECOND METHOT OF OPENING A PLUG THAT IS RUBBER ON THE JACK AND FILL IT WITH OIL AND IF I PUT MY FINGER ON THAT HOLE AND TRY TO PUSH ``A`` DOWN THE PRESSURE RISES ON MY FINGER. AND WHEN I TRY TO JACK IT UP IT DOES NOT. EISH TRY HELP ME

[@eltunene]

Dear Moshitoa, first of all, thanks for your question. I learned about hydraulic jacks back in the early 1950s, and then my life turned to electronics for the last 60 years. However, maybe I can be of help to you by trying to find more info on that. About hydraulic jacks, most of the information around is generic, since they work on the same principle. So I would suggest you to watch the following video at: kzbin.info/www/bejne/q4OxmYh5et2oa7s Without saying a word, this guy cycled the hydraulic jack several times in order to rinse it, fill it and purge it. Notice he never removed the E valve at all, just opened and closed it as part of the recycling process. I think this wordless explanation is worth a million words! Please update me on your final results.

[@deesnuts4993]

Thank you for the explanation Very nice to learn something new

[@eltunene]

Thanks, ven jazz, for your kind comment!!!

[@azharsiraj]

Excellent

[@eltunene]

Thanks, Azhar, for your kind comment!!!

[@zoeminnaar8451]

Can it be used for a machine that picks up heavy heaps of wood?

[@eltunene]

Dear Zöe, well, yes, however, if the motion has to be done for distances over 3ft, or so, you can try using an old power steering system, pump and all, driven by an electric motor. I have seen people use that for dump trucks, so it can be used for building a crane. Here are three links to videos on applications of power steering components for other uses - kzbin.info/www/bejne/qWTYaKiNnqugl80 - kzbin.info/www/bejne/i4mmqHmprbmnf6s - kzbin.info/www/bejne/hoSkpX-Eo52Brac

[@abdullahghurbal37]

very useful and helpful tutorial , Thanks man.

[@eltunene]

Thank you, Abdullah, for your kind comment!!!

[@sharshabillian]

The demo is good, but the reason why so many people disliked it is the voice in the beginning is shocking. Other than that, the demo is great.

[@sachindulal2397]

Thanks for your explanation.

[@eltunene]

Thanks, Sachin, for your kind comment!!

[@kabtennameq]

thank you. but why we should use a special oil to do that ???

[@eltunene]

Almost any fluid would do, however, the cylinders have rubber gaskets and o rings which may be damaged by some liquids, so special hydraulic fluid is better in order to keep the jack in good working order for a long time.

[@adamwarszewo2]

Great movie Sir.

[@eltunene]

Thanks, Adam, for your kind comment!!

[@bosox2318]

Brilliant. Rebuilding one and this is exactly what I was in need of.

[@eltunene]

Thanks, Matt, for your kind comment!!

[@mastertrey4683]

Hydraulics are such amazing but surprisingly simplistic machines. Wwoowww

[@eltunene]

I totally agree!!!

[@izyanemalik6480]

thank you

[@eltunene]

Thank you, Izyane, for your kind comment!!

[@thcenterprisellc112]

Very nice ! Thank you for teaching me that subject it helps me a lot with what I’m doing

[@eltunene]

I am very glad to be of help!! Thanks for your kind comment!!

[@oompalumpus699]

Simple and concise, brilliant.

[@eltunene]

Thanks, Tyrant67, for your kind comment!!

[@tcmusic_thomas_upton]

Good explanation of the principles involved. Thanks.

[@Kaleabe25]

Thank you, Great explanation

[@eltunene]

Thanks, Kaleabe!!! Please watch my videos on solar power, the energy of the future!!!

[@choudharysaab4279]

Wow nice it's simply and clear to understand thanks

[@eltunene]

Thank you very much, Prem Bhai!!!

[@diulaylomochohai]

How does the overload valves work?

[@eltunene]

Dear friend. Those valves are factory set, and are supposed not to be tampered with, trying to get more lift. However, I found a very explanatory video about them, please watch it here. Regards! kzbin.info/www/bejne/aGrNoYVshtWcidE&ab_channel=SmallEngineDIY

[@hersonlamolli6276]

My 4 tons bottle jack is down, but it is stuck. How could it be fix.

[@eltunene]

Almost any stuck valve or piston can cause this, it is recommended to replace all o-rings to start with. The rubber parts have a relatively short life, and are the achilles' heel of hydraulics.

[@andrejosuawungow7733]

What a helpful video! I'm doing a project involving this mechanism. May I ask for your permission to use your video for presentation?

[@eltunene]

Yes, but please do not download it!

[@eltunene]

Thanks, Orville, for your kind comment!!

[@editerpro9943]

Thankyuo

[@eltunene]

If you mean upside down, it will, if you add a small piece of pipe inside. MrDKDIY did it, please take a look at kzbin.info/www/bejne/qZnbdmx7j9yZhMU&ab_channel=Mr.DKDIY

[@pankajdavada3188]

Nice video created by you Which software is used by you will you suggest me

[@eltunene]

Dear Pankaj, I use very simple software, I am currently using Inkscape for frame by frame animation, very simple. However, there are many nice animators our there, but I have never used them.

[@TellAStoryofficial00]

Was all Base on pascal principle. Nice work of explanation

[@eltunene]

Thanks, Imoisili for your kind comment!!!

[@KarlBassermann]

Very good explanation!

[@martinloh5553]

Fucking amazing video. I own a hydraulic jack and always wondered how it worked. Im baffled by its utter simplicity Thanks

[@eltunene]

Thanks Martin!!!

[@amogistrek]

im about to cut (open) my hydraulic jack to see how it works. ur video save my jack. thanks

[@eltunene]

Scientific curiosity, I used to do the same with all my toys, ha, ha.

[@ondraspendlik9759]

Thanks God anatomy books exist, I don't have to cut people open when I want to learn drawing human body studies :D But seriously, I'm at engineering school now and I'm working on our final project, I picked a pallet jack and this helped me a lot with design of the mechanism

[@titusmunyua9982]

A nice explanation. Thanks

[@eltunene]

Thaks, tito tito!!

[@BottleJackBuddy]

Nice video!

[@eltunene]

Thanks, Bottle Jack for your kind comment!!

[@MindenMoose]

Thanks so much. Very clearly done.

[@eltunene]

Thanks, MindenMoose for your kind comment!!

[@triumfdula8830]

Hello, what hydraulic press ton we need to straighten a 5mm thick aluminium plate 5 x 5 inxh wide ?

[@eltunene]

Hi, Triumf, honestly, my background is electronics, and old fashioned electronics. I did find a video which describes how to straightening cast aluminum using a heat gun. Unfortunately the narration is in Spanish, but the images speak by themselves. The problem with aluminum is springback, so heating appears to be a must. Please let me know if you made it using heat from a heat gun.

[@triumfdula8830]

Chava Tarin thank you i'v seen it with a heat gun but i thought if it would work only by pressing, i didn't know that aluminium have springback effect, anyway thanks for the information you have

[@labradorislove]

Welcome to weird youtube recommendations. We will now meet after 10 years when this appears in my recommended again.

[@joemeroles5936]

Why would the jack work perfect under no load and not work once load is added

[@eltunene]

Very possibly there is a leak in some valve or seal, and under no load, you can pump enough oil to raise the big piston, but when under load the leak would be sufficient to retur the oil without raising the piston.

[@joemeroles5936]

Thanks for the reply so I guess the jack would be garbage

[@puttavenugopal1074]

at the return stroke how fluid comes back and i have not understand regarding butterfly valve can be please kindly help me sir

[@eltunene]

When the small pump is working, it takes fluid out from a reservoir placed around the big cylinder. When it is time to lower the load again, the butterfly valve lets the fluid return to the reservoir and the big piston goes down. If you open the butterfly (so called because of the handle it has) wide open, the piston moves rapidly and the load drops down suddenly, if you open it just a little bit, the load comes down slowly. You can even close it and stop the load midway. It's just a way to empty the big cylinder and return the fluid back to the reservoir. I hope that helps.

[@marmarkhinghi4743]

So clear, thank you.

[@kennethkemei8482]

Which is the best fluid for hydraulic liftings

[@eltunene]

Functionaly, almost any fluid would do, however, the cylinders have rubber gaskets and o rings which may be damaged by some liquids, as well as steel parts which can rust, so special hydraulic fluid is better in order to keep the jack in good working order for a long time. Hydraulic jack oil is low viscosity, essentially the same viscosity as 10W motor oil. Never use brake fluid, antifreeze nor water, it will damage your jack.

[@aneripanchal1127]

very nice technic to explain

[@jeffreyyeager1398]

that is an excellent demonstration. Thank you

[@eltunene]

Thank you very much!!!

[@johnbarron4265]

Bottle jacks can have far superior load capacity and mechanical advantage for their size and weight compared to other types of jacks. The only downside is that they cannot lift as fast as the traditional lever jack assuming the operator has sufficient strength. What you gain in mechanical advantage, you lose in speed. Hence you want just enough mechanical advantage so that you can repeatedly pump the jack handle without fatiguing.

[@eltunene]

Thanks for your contribution!!

[@MrDhilishkumar]

Good . Show the oil flow in different colour

[@eltunene]

Good contribution, thanks!!

[@francleowellmontefalcon2287]

very clear! thanks bro

[@eltunene]

Thank you, dear Franc, for your kind comment!!!

[@Chaudhary-concrete]

good explain brother

[@eltunene]

Thanks, Evergreen, for your kind comment!!

[@Chaudhary-concrete]

I'm grateful to you.

[@Hidden_Seeker_]

Thanks for the video, dude. Very helpful!

[@eltunene]

Thank you, Voltaire, for your kind comment!!

[@rambaburajputhimmatpursaik8832]

Very nice

[@eltunene]

Thanks Ram Babu!!!

[@Peppins]

Anyone know if is possible to remove the manual pump and install a rapid connector to use an eletric pump?

[@eltunene]

Dear Peppins32, I have never done it, but here is an ingenious approach by Dr. Hacker! kzbin.info/www/bejne/kJrSdHSXm6ijoNU

[@diana0423]

Thank you so much, I can understand it!

[@eltunene]

Thanks, Diana, for your kind comment!

[@bobbylee3042]

How do they run out of oil?

[@eltunene]

Any leak due to a bad gasket or seal, can cause a jack to lose oil gradually. Normally those jacks last forever, but sometimes, if used very frequently, they will develop leaks and start to malfunction.

[@gloriousbliss3481]

Thank you for making this video

[@eltunene]

Thanks, Glorious Bliss for your kind comment!!

[@Faz527]

Nice Explanation

[@navinlessing7053]

short simple and educative. thanks

[@eltunene]

Thanks Navin, for your kind comment!!!

[@annakhan2237]

Very useful 👍

[@eltunene]

Thanks, Anna, for your kind comment!!!

[@tamejayyt4214]

Once video now I know how it works

[@eltunene]

Thanks, Tamejay, for your kind comment!!! I invite you to watch my videos about solar power, they are at kzbin.info/www/bejne/jKSZhn2Khqt-mpo .

[@bhojpuriworldvideo3166]

Very good

[@eltunene]

Thanks a lot, Umesh!!!

[@micdal22]

Thanks much for an excellent video clip. It gives the best explanation for how a hydraulic jack works. I have two such jacks that have failed. Can you advise what is the most common cause of failure of hydraulic jacks and if they are easy to repair. Thanks again for any advice.

[@eltunene]

Well, it depends on the type of jack and use. For instance, in tripod jacks, one of the legs may have a crack or dent and that can be fatal for the worker under the vehicle. However, in normal bottle jacks the most frequent cause of breakdown is the seals, an upside down installed seal is not uncommon, same as using corrosive fluid, such as brake fluid for the hydraulics of a jack. Also, balls in check valves seem to last forever, however, a check ball not seating properly or a burr or dent on the seat can be very bad for the dependability of the jack. Maybe the best thing to do would go to a professional for major repairs, such items as jacks are essential for a safe work environment and it is preferable to use no shortcuts. Contamination with dust can also be very bad for jacks, since valves and pistons can stick or the seals can wear out quickly. In exterme cases, cracks in the cylinders can render a jack inoperative.

[@bridgendesar]

I had an idea on how they worked, but it's nice to see it explained

[@eltunene]

Thanks a lot!!!

[@charleskimani8118]

what will happen if u increase the diameter and height of s mall cylinder

[@rockefeller1787]

Very useful 🙏🏽

[@eltunene]

Thanks, Alieu, for your kind comment!!!

[@charleskimani8118]

what will happen if the size of small cylinder is increased to make the big cylinder lift faster

[@eltunene]

Dear Charles, the relative sizes of the small cylinder and the big cylinder are like the arms of a lever. The long arm travels a longer distance with very little effort and moves the short arm a shorter distance with a lot of force. If you use a big cylinder instead of the small cylinder, this is equal to using a lever with same lenght arms. Both arms travel equal distances. You would have to exert the same effort with your hand in the input arm as you expect to appear on the output arm. You can try this: try to lift a heavy object with a lever, short arm as output and longer arm as input. You can easily jerk the object up and down. If you slide the fulcrum until both arms are equal, you will have to exert great force for barely moving the heavy object. Same thing happens with the relative sizes of the cylinders in the hydraulic jack!