Hydraulic Cylinders Push Harder Than They Pull

Рет қаралды 7,104,651

Күн бұрын

If you have ideas/suggestions for videos like this, make sure to leave a comment. I read them all!
-Aldo
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Sounds by ‪@TheJustinator‬

Пікірлер: 1 200

@Weeaboo_AF 8 ай бұрын

Damn. I never even thought about this, but it's so obvious now!

@ARockRaider 8 ай бұрын

that's how it is when something is property explained

@ARockRaider 8 ай бұрын

@enriqueamaya3883 congratulations, but spam is not how you bring more people to your religion. for the good of your own faith please stop spamming.

@stinkyvonfishstix4196 8 ай бұрын

@enriqueamaya3883you should go on with that nonsense

@jonslg240 8 ай бұрын

TIL: I can't pump very hard because of the size of my rod.. 😂 "HEYOO!"

@Walczyk 8 ай бұрын

i still s don’t understand

@SilverTerog2 Жыл бұрын

Holy thats a smooth loop

@KnowArt Жыл бұрын

thanks

@unni.m1959 Жыл бұрын

@AnitaStellium 11 ай бұрын

I was like, where the fuck does it end. This loop got no stop what so ever.

@1islam1 9 ай бұрын

@@KnowArt⚠️ God has said in the Quran: 🔵 { O mankind, worship your Lord, who created you and those before you, that you may become righteous - ( 2:21 ) 🔴 [He] who made for you the earth a bed [spread out] and the sky a ceiling and sent down from the sky, rain and brought forth thereby fruits as provision for you. So do not attribute to Allah equals while you know [that there is nothing similar to Him]. ( 2:22 ) 🔵 And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful. ( 2:23 ) 🔴 But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.( 2:24 ) 🔵 And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally. ( 2:25 ) ⚠️ Quran

@truthfinder6538 8 ай бұрын

Yes just like it will smoothly loop in your head 💀

@rizkisasongko1317 8 ай бұрын

Yep. Push movement has more power than the pull movement. But pull movement has more speed than the push movement, because the volume that needed to fill the pull room is smaller.

@Electricfy706 8 ай бұрын

This need more like.

@calvin2013 8 ай бұрын

Fill what room? If you are pulling you are filling the room without the bar which is a bigger room…

@tjn1017 8 ай бұрын

@@calvin2013 no??? Pushing is the empty space

@calvin2013 8 ай бұрын

@@tjn1017 that is what i said bruh are you ok? The “empty” space gets emptied when pushing and filled with air when pulling. The space with the rod gets filled when pushing and empties when pulling

@OK-Lamb 8 ай бұрын

@@calvin2013I think you are confused with your english sir.

@doimoi958 Жыл бұрын

I love the sound design! Glad to see people putting actual effort and good content to shorts

@KnowArt Жыл бұрын

thanks! I´ll tell @thejustinator (the one that made the sounds for this video) you liked it.

@TenMillimeterSocket Жыл бұрын

It’s nice to see, but rare since it’s almost not worth it with how shitty the creator fund works, you could have a billion views and countless likes and not get a single cent @masteroogway for reference

@johndc2998 7 ай бұрын

Love the sounds @@KnowArt

@Smartsometimes 2 ай бұрын

This is not true. This is strictly based on exterior atmospheric pressure increasing per volume due to elevation. Which is why most hydraulics are positioned vertically not horizontally Unless based on a pressure system i.e. external force power.

@Im_a_jinx-4 9 күн бұрын

Could you curve it so it had more surface area@@KnowArt

@mfbooty_smacker 8 ай бұрын

I actually work in a hydraulic repair machine shop and as a basic technician I didn’t even know this ( but it does make sense)

@KnowArt 8 ай бұрын

Glad I could help

@johannjacob 7 ай бұрын

I worked on a few types of cylinders used in industrial machines and somehow this was one of the first things I inferred. Had to somehow prove it to my senior but fortunately another guy at work backed me up

@electricpaisy6045 6 ай бұрын

Really? I learned that in a 2 week side seminar about pneumatics during my training as electrician. I thought it was comon knowledge in the industry.

@pstrap1311 4 ай бұрын

@@electricpaisy6045 it is. Cylinders with this design are described as "unbalanced. "Balanced" cylinders have an extra long rod that extends out the back wall of the cylinder through seals. Balanced cylinders are used when symmetrical operation is desired, for example a boat steering cylinder. Otherwise there will be significantly faster steering in one direction than the other.

@gimmeaford9454 4 ай бұрын

I was a hydro troop in the USAF and that was something we learned day one.

@mxicros Жыл бұрын

This is correct if we keep the same working pressure. In the case of needing to do the same job, you only have to increase the pressure on the rod side.

@felixar90 10 ай бұрын

It’s easier to just design the system to have enough pressure to pull with sufficient force, rather than have 2 different pressures. The push stroke will have some extra force but it usually doesn’t matter. What is often a more annoying problem is that the cylinder extends slower than it can retract, because the piston side has a greater volume to fill than the rod side. This can be solved to a extent by recycling the oil coming out of the rod side into the piston side instead of going to the tank. This is called regeneration. This doesn’t work when extending under a substantial load tho.

@stretchhfab7315 9 ай бұрын

@felixar90 so what your saying is exactly what the other guy wrote only in more detail of a specific system.....Okey dokey

@fitito500 9 ай бұрын

Or simply change the relationship between surfaces by reducing the diameter of the connector on the extraction side 🤷

@windowtintman1986 9 ай бұрын

@fitito500 doing that would reduce the load limit for the hydraulic cylinder, making it weaker. Doesn't sound like a good trade off.

@Ansarbaloch-lk9rc 8 ай бұрын

❤❤❤❤❤❤❤❤

@RandomAcousticMan 5 ай бұрын

The sound effects be going like "OUOUOUAAA"

@JoeMama-sx4qz Жыл бұрын

That loop is so smooth, it made me watch it twice and didnt suspect anything till the 3rd time

@Stranger_Box1 7 ай бұрын

I watched it 5 times :(

@gideonk123 5 ай бұрын

How can you really be sure how many times you’ve watched the loop?

@lokeshgnanasekar Ай бұрын

Lol I watched a lot of times

@seanmaguire3645 4 ай бұрын

My pulling game is also weak hydraulic cylinder😢

@adriandiaz-cabrera1733 4 ай бұрын

Don't play, you have no game to begin with.

@monsieurmig8969 4 ай бұрын

@@adriandiaz-cabrera1733that makes 3 of us

@Itzarzky 4 ай бұрын

my favorite types of pies are creampies as well

@vintage-radio 3 ай бұрын

@@Itzarzkyrelatable

@Itzarzky 3 ай бұрын

@@vintage-radio greatest feeling until she hits u with a pregnancy test and your heart drops to the floor

@adamgibson9357 8 ай бұрын

Extend/Retract > Push/Pull. Most confusion stems from nomenclature and language barriers (technically hydraulic systems dont pull. The pump is already creating pressure, which makes it easier to switch sides of the cylinder instead of having a positive pressure pump and vacuum pump for each side)

@KnowArt 8 ай бұрын

you also wouldn't get very far with a vacuum pump as it can only ever get 1 atmosphere of pressure on the other side without a pressure pump

@mafinalmessagechangedaworl7131 8 ай бұрын

Layman’s terms. The rod is pushing and pulling

@ke6gwf 8 ай бұрын

It depends on if you are talking about the hydraulic system or the mechanical system it's operating. For instance, when the hydraulic system is extending the rod, it is Pressing on a hydraulic press, and Lowering on a crane outrigger and Lifting on a forklift and Pushing on a trash compactor. And in this animation, it's pushing the rod out and pulling it back in, even if the pressure is still Pushing on the rod end of the cylinder. It's all about perspective

@susansu-p5o Ай бұрын

I am from China Seals Factory. Our company produces many types of hydraulic oil seals. If you are interested in our products, we can send you free samples so that you can learn more about our products.

@jeremysonneman1330 Жыл бұрын

Oh you should do one for how if you connect both sides with lines and pressurize it, it'll extend a lot faster since the pump is only replacing the volume of the piston rod. It's called a regenerative circuit. It'll extend fast with less power and retract slow.

@KnowArt Жыл бұрын

oh! that's a cool fact. Is that used on big machines? No promises, but I'll put it on the list for research!

@felixar90 10 ай бұрын

@@KnowArt it is used on large hydraulic presses, not when pressing, but when moving the ram into position so it’s a bit faster.

@mountainfarm5318 9 ай бұрын

Kind of like AC vs DC

@TimpBizkit 7 ай бұрын

I had to work that through in my head but I can see how it works now. I thought the two would just fight each other and slow it down even more, but really both sides are just expanding and spitting the piston out by replacing the metal volume with fluid as if it's just a steel rod with its end sticking out of an airtight hole in a container of expanding fluid. The force is pressure x the cross sectional area of the ram, so not quite as much as either the push or pull (unless the ram is really thick). Well it will be the push minus the pull actually.

@Crlarl 3 ай бұрын

@@mountainfarm5318 No, not really anything like AC vs. DC.

@mattie8162 2 ай бұрын

I love these videos so simple yet the educate and are often times entertaining

@susansu-p5o Ай бұрын

@xxskizzumxx 4 ай бұрын

Hey, that actually makes sense.....thank you

@sunrisetacticalgear2676 10 ай бұрын

My hydraulic guy used the term “rod displacement”

@thtdrgnmn 6 ай бұрын

And this is why I believe we need a ride engineer appreciation day,. Because they have to think about these things are just the tip of the iceberg of things they have to put into account!

@susansu-p5o Ай бұрын

@coriscotupi 7 күн бұрын

Let's take a moment to appreciate the masterful editing. The moment that the the video ends and repeats in loop is just not detectable. One could watch this a few times before realizing the loop point has already passed. Oh and the subject was pretty interesting too.

@Beamestatilea 4 ай бұрын

i learned about this in my automotive class! it’s actually really neat how it’s used in suspension

@DukeEllision329 4 ай бұрын

How is it used in suspension?

@ESSBrew 2 ай бұрын

That makes sense now

@yhawjoey486 Ай бұрын

Shock absorbers I guess

@RajivKC 8 ай бұрын

This guy just appeared out of nowhere and started answering all my questions

@MrJokkoma 9 ай бұрын

Yep one of the first lessons in machinery school 30 years ago.

@KnowArt 8 ай бұрын

any other lessons that would make a good video?

@MrJokkoma 8 ай бұрын

@@KnowArt It would perhaps be interesting to know how to calculate hydraulic pump flow. Or what to measure hydraulic flow whit, everybody has bar gagues to messaure pressure but flow seems harder to messaure.

@KnowArt 8 ай бұрын

@@MrJokkoma hmm... measuring flow, interesting! Also the age old question if a pump generates pressure or flow could be fun, now that I think of it.

@ke6gwf 8 ай бұрын

@@KnowArtsounds like an excellent subject to generate "engagement" as everyone tells you that you are wrong, and the rest of us argue with them! Lol

@garychief2338 8 ай бұрын

@@KnowArt flow is impossible without pressure. Physics isn't mad, just disappointed.

@innovativeyetaknowledgless9035 3 ай бұрын

When operating equipment on a farm I always wondered how these things actually work. Now I do.

@susansu-p5o Ай бұрын

@JugganLoo 4 ай бұрын

So just use 2 cylinders 1 for pushing one for pulling boom problem solved

@LOL666PX 4 ай бұрын

you are NOT an engineer am i right ?

@Skilow 4 ай бұрын

@@LOL666PXidk man he just fixed an issue by turning it into two issues, I think he's qualified.

@JugganLoo 4 ай бұрын

Its what they commonly do to fix that unavoidable issue

@Shooting_Stuff 3 күн бұрын

Yes this is called the anular area(the side of the piston with the rod) and the full Area(the side of the piston without the rod) Aa=Af-πxR²(Rod) Or it can also be calculated as Af- πxD²(Rod)/4 this is also true for pneumatic systems as well.

@ll-OnlyXans-ll 8 ай бұрын

That loop was so smooth I got hypnotized and watched this short for the past 2 years. Nonstop

@ll-OnlyXans-ll 8 ай бұрын

Help me

@susansu-p5o Ай бұрын

@MinhazurSarker Ай бұрын

Never disappoints with the background sfx 😂

@thomasbatdorf5913 4 ай бұрын

The hydraulic power is determined more by the pump than the cylinder. Because while there is more positive pressure going one direction there is more negative pressure going the other negating the statement in the video. The direction of the cylinder is really just a storage reservoir.

@susansu-p5o Ай бұрын

@ArchangelExile 3 ай бұрын

Intuition always told me that hydraulics can push harder than they can pull but never considered this to be the reason, as I've never actually consciously thought of it until now.

@LynX-xx3gj 4 ай бұрын

Could you possibly make the piston rod side like a concave ish shape and keep it flat on the bottom so that there is more surface area on top that equals that of the bottom side?

@werwurm 4 ай бұрын

You'd just add perpendicular force components that cancel out (that is, if the shape is symmetrical. If it is asymmetrical, there should be a force pushing the piston to one side of the cylinder wall, which also doesn't help.)

@LynX-xx3gj 4 ай бұрын

@@werwurm hmm interesting, how about a convex shape instead?? Would that work

@zsigmons 4 ай бұрын

The surface only matters if it is perpendicular to the direction of the motion. By making it convex or concave you wouldn't increase the perpendicular projection of the surface and thus it wouldn't change anything.

@Ingo-go2qn 2 ай бұрын

@@zsigmons Yes that is correct. You only consider the “footprint” of that piston or the “shadow” in direction of the movement of it.

@susansu-p5o Ай бұрын

@alyssaa- 7 ай бұрын

straight to the point with no filler, love your videos man

@JurassicJosh341 7 ай бұрын

“How’s your pull out game” My pullout game:

@FinancialBasicsMastery-tb8rk 4 ай бұрын

Better than my Engineer class 😅

@orien2v2 Жыл бұрын

This is peak smoothness 🤌❤️

@davidhardman6291 22 күн бұрын

This is a beautiful example of hydraulic power. People sometimes think if I will put a bigger engine on their wood splitter they will get more splitting power. Unless your splitter is under powered for the cylinder it has a bigger engine is not much better. You need a bigger cylinder.

@musicaddict4214 4 ай бұрын

Wouldn't the piston also reduce the volume in the upper half, thus the air would have to fill a smaller space and would be denser. Wouldn't this denser air then apply a greater force and equalize this disparity?

@deku976 4 ай бұрын

Nope, because the volume decreases at the same rate on both sides, as in when you move the piston halfway, the pressure doubles, and that works for both sides. It would only apply if the amount of air is the same on both sides and that's not true due to 2 reasons. 1) the piston rod doesn't displace the air on the other side, it replaces it so the pressure equalises. 2) it's hydraulic, so there is no air

@nasrulabidin858 4 ай бұрын

The rod is the difference

@masonhettinga9609 4 ай бұрын

He said hydraulic not Pneumatic so it's using oil which don't compress

@susansu-p5o Ай бұрын

@birdswindow 2 ай бұрын

the sound design is tickling my brain

@fuhkoffandie 9 ай бұрын

Yeah I get it. One is work, and the other is returning back to work.😂

@KnowArt 8 ай бұрын

lol

@Ansarbaloch-lk9rc 8 ай бұрын

❤❤❤❤❤❤❤

@dovos8572 3 ай бұрын

that sound effect wasn't what i needed to sleep... now i'm awake again at 3am

@susansu-p5o Ай бұрын

@jacqstrappe 8 ай бұрын

WHY ARE ALL YOUR LOOPS SO GOOD

@joshw.2739 2 ай бұрын

I love learning about these specific emergent behaviors that only exist in a real-life system.

@marcviej.5635 Жыл бұрын

the sound is so funny 😂

@marcviej.5635 6 ай бұрын

@MilkyLore thanks

@robertgift6762 7 күн бұрын

As a young boy, I asked if steam locomotives would evidence dis.

@Laughing_Central638 Жыл бұрын

Never think of that.glad to listen these essential things 😅😊

@TheRazzband Ай бұрын

Bro's watch time is probably perfect because of how good these loops are

@RoastHardy 4 ай бұрын

Can't the rod be perforated so the checkered area can be reached by the oil if a hollow rod is used?

@joseorozco8147 4 ай бұрын

No, por qué seria una camara diferente y no causaría ningún efecto hidráulico.

@joseorozco8147 4 ай бұрын

Lo que se puede hacer es usar un embolo con doble vástago.

@Tommy-pv1vh 4 ай бұрын

Can't, cause the holes would cause leaks

@kingofnight0535 4 ай бұрын

Could be possible but then weight or force apply by or on piston should be less. I mean rod weight carrying capacity will decrease

@kadmow 4 ай бұрын

you can delete the rod, then the force is equal in both directions (zero).. lol...

@sgtrogers 2 ай бұрын

Netflix: Are you still watching? Someone's daughter:

@poo48 Жыл бұрын

What about rodless cylinders?

@KnowArt Жыл бұрын

Didn't know of their existence. Thanks, they seem interesting. I expect they would not have this problem. But at first glance they seem more fragile in general.

@RWRKofficial 2 ай бұрын

Industrial mechanic here, on of the first thing we learned in college. It’s one of the first when starting this course. :)

@susansu-p5o Ай бұрын

@jboysalem1388 4 ай бұрын

Why did you put this script? (Even though its the same pump) So youre assuming that if its not the same pump it still cant push harder than it pull? you messed this up. if you put 10hp motor on push pump and 1hp on pull pump. itll push more than it pulls, so why are you teaching WRONG things?

@michaelglatz1145 4 ай бұрын

Nearly all hydraulic systems use a single pump. Valves are far cheaper than additional pumps

@LuisAndrewSerra 15 күн бұрын

I was in public with earphones when those wacky sounds played and I thought someone's gone crazy

@SanjeevDarnal-k7t 7 ай бұрын

"Igotaglockinmairari" one of the wisest word.

@niclikescakes 3 ай бұрын

I love every single one of KnowArt's shorts. Elegant, straight to the point shorts.

@susansu-p5o Ай бұрын

@Zirkitri 6 ай бұрын

i really like how this channel makes interesting loops out of things I don’t give a shit about

@idemanddonuts 3 ай бұрын

You can also send pressure to both sides to rapidly extend the cylinder. It's because the shaft would effectively reduce the volume of the cylinder so you need less fluid. But it also means you have much less force

@Smith_Tech_70 7 күн бұрын

Makes me laugh when folks say "you will have more force if you turn it around", even though it's exactly the same in any orientation.

@alexandercuthbertson 8 ай бұрын

I love this account. Quick, simple, and well executed explanations for so many things

@susansu-p5o Ай бұрын

@hyper.technic 3 ай бұрын

I love how everyone is surprised like wtf did you think was going on in there.

@Cnmong 5 ай бұрын

Good to see this a year after it was tested on my engineering paper

@bulletproofpepper2 5 ай бұрын

You can use this mechanical advantage to create more pressure than the pump pressure is putting out. It does take a little time we maxed out a pressure gauge in hydraulic class. With check valves and sequencing blocks you can build incredibly high pressures. You can retract faster also by using that pressure differential too. Unload cylinders can use the extra flow in amazing ways.

@CameronCorless-yf9wt 8 ай бұрын

I was studying to be an engineer but changed to psychology. These videos scratch the engineering itch like nothing else I’ve seen in the past few years since switching.

@gavmansworkshop5624 3 ай бұрын

That's why double acting steam engines have that "chooof chiiiiiif" to them.

@AmenProletar 3 ай бұрын

This is something I am currently studying in mechanical engineering. Interesting animation!!

@not_vinkami 2 ай бұрын

If anyone's confused, to push in this context means the piston is extending and the rod is going out of the chamber, while to pull means the piston is retracting and going into the chamber, not the other way round.

@The_Appolo 8 ай бұрын

Bro's asking questions i don't even knew i had

@weidwingelobjegdiv 7 ай бұрын

This channel gives you the knowledge you never expect 😂.

@gunnison3681 Ай бұрын

That's why we install reducers on the rod side. Equal pressure on both sides

@Hoergupjelly 3 ай бұрын

The noise itches the abyss in my skull

@decipheringenglishleaveitt3812 Ай бұрын

Pascal's law. The force that a piston generates is directly proportional to the surface area of the piston.

@lumberjackofalltrades 8 ай бұрын

I like these simple animations that break down mechanical principles in ways that seem obvious in hindsight.

@minnosthecat3586 3 ай бұрын

It’s been more than 3 years, I have lost track of time. I missed my wife’s second baby, my son’s 18th birthday, and my jury. I don’t know when it will stop.

@winkystinky 7 ай бұрын

the loop is teaching me more than just watching it once. good job bro omg

@sandewhimsara9277 4 ай бұрын

I have been watching this...for 30 minutes!

@Litepaw 8 ай бұрын

Your sound design is so fantastic that i missed every single word on my first watch 😂

@EnviroSteward Ай бұрын

Dope...simple! A life changing blast of information in 20seconds😮😮😮

@2DE808 3 ай бұрын

Ok, for our next lesson, apply equal pressure to both sides. Which way does it move? This is a basic principle used in automatic transmissions since their inception. Now do a search for "regenerative valve" primarily used in loaders. I put one on my log splitter, time saver for sure!

@IsaacTGamer 4 ай бұрын

all your videos are loops and I love it

@azgerrr 5 ай бұрын

These loops are trippy. I watched it 4 times before realizing it was looping

@coolguy5957 8 ай бұрын

I build hydrolic cylinders from scratch. It’s hilarious how simple they are.

@khalief_. 2 ай бұрын

this guy dude always got me with his loop

@IgorIgor-wk5bg 4 ай бұрын

the noises are making my brain funny

@DarukaZsombor 7 ай бұрын

The gas in the top part of the chamber is just going to have to push on a smaller surface, which means that if the density of the gas is the same as in the lower part of the piston, the force would be the same, because the same amount of pressure is going to apply to a smaller surface, which just means that the preassure is going to be bigger for cm²

@lincolnbliss4885 Ай бұрын

Lol I actually thought of this as a variable before seeing this video. Also the size of the hose port in a hydraulic ram can also effect performance. A smaller port with less flow creates more pressure inside of the ram compared to a larger port with more flow.

@111455 8 ай бұрын

i stayed for the sweet sound effect

@nakshatraneel4029 5 ай бұрын

Gotta appreciate the details in sound effects. Love those ngl.

@heatrotom197 4 ай бұрын

yep, to counter this, there are rapid escape valves that give the liquid an space to escape faster; as a curious fact, the contrarious of this are the strangler valves, wich uses a little trothel wich permits the pass of more or lees fluid

@maverickmissile801 8 ай бұрын

Works for pneumatic cylinders too!

@112233bigboss 5 ай бұрын

Sometimes when it is a perfecf loop I don't realize it's loop and I just keep watching thinking it didn't finish

@cbmech2563 4 ай бұрын

Yep, I've been working with that for the last 50 years. I'm a heavy equipment/ trash truck mechanic

@mr.kakerudanielvl6496 3 ай бұрын

As The Art of War Seems obvious, but even the smartest may need it's asistance. This is so obvious, didn't even realize it until you said it

@samuels1123 3 ай бұрын

There's also a tank somewhere off frame which stores the excess hydraulic liquid when the cylinder is retracted

@livingcontradiction2249 7 ай бұрын

Oh, so that's why both the pneumatic and hydraulic pumps in my school push slowly when I apply them on both sides xd

@JSmith19858 7 ай бұрын

I currently have a cylinder on my bench that has a rod out both ends, so would be balanced. The rod out the other end is used with a scale to measure displacement

@Random_Dragon_Furry 8 ай бұрын

I was thinking to myself well No duh but then I remembered not everyone goes to college for this stuff.

@davidhenri2722 28 күн бұрын

My brain hurts so much, I think I am having deja vu

@sad6452 4 ай бұрын

I keel watching this guy and he has the best loops ever

@sudhajashu3286 4 ай бұрын

Yup as a piston i can confirm that I too have a problem pulling out faster 😞

@Maztrador 3 ай бұрын

''The perfect loop doesn't exist''

@randomperson-kv5nx 7 ай бұрын

Getting 2 of these videos in a roll feels unreal and nice.

@mob_slaya1866 5 ай бұрын

Speaking from someone who rebuilds em on heavy machinery from time to time,when the lines pop like popcorn or the endcap seals fail, there is a mess and/or carnage left behind on most occasions. Most hydro line fails end up dumping around 5 gallons. However, i have had to put up to 60 gallons after a main feed line blew, and the operator ran the excavator(cat 330bl) until it stopped moving. Hydraulics can be very dangerous