Bypass testing a hydraulic cylinder

A demonstration of a quick method for bypass testing a hydraulic cylinder

[@bradbryan9137]

This guy has the gift of teaching. Thank you!

[@madaxe79]

Not bad for a young fella hey. I grew up around hydraulics but never listened to my dad while he was alive, and now there’s all these questions I have, and this young fella is answering them for me... what a champ

[@clanseystrome7437]

This is seriously the easiest way to check cylinders! Amazing mate!

[@zavalondc]

I’m sardinian, here in my country I’m not able to find this kind of video-tutorials in my language, people like you are very usefull also to teach more english to us “the foreigners” ;) bless you

[@pradeeph02]

Best training i have ever attended infact its difficult to demonstrate theory as well practical... which is very well explained and covered

[@allanholiday1690]

What a great teacher. He's able to show things in such and such a simple manner that it's easy to understand.

[@cl7510]

Allan Holiday He is. Wish I would’ve had someone like him to learn from back when I started wrenching on heavy equipment.

[@starhopper457]

Nicely done, Sir!! This also explained the failure of my hydraulic ram on our RV slide out. It would go out, but not come in! This clearly explains the fundamentals of hydraulic action!!

[@WirelessDreamer]

Thank you for taking the time to explain this so clearly. I'm new to working with hydraulics, and on my way out to run this test on my loader cylinder

[@brggmc]

Thank You for such a well presented video. No fancy moves, just straightforward helpful stuff as always!

[@koreakiwon]

Your clips are very easy to understand even for foreigners like me. Thank you so much.

[@arthurfrilingos1860]

Absolutely great video! You described the problem succinctly with detail and with a demonstration. Leaving little doubt in the observers' mind! Well Done!!

[@bloggers7281]

Brilliant. Man you are really blessed with knowledge and teaching skills.

[@Basempass]

Very useful, thanks a lot for sharing, the presenter is an amazing man, god bless

[@Texanfirst727]

Found in the Bobcat Skidsteer service manual this exact test, and exactly how to properly perform.

[@roycarter6235]

Another great video with simple easy to understand demonstrations thank you

[@kameshellappan4326]

Great !! that was mastered level of explaining with real time example with demonstration

[@matthewbricketts]

Great demonstration and very useful - Thank you for sharing.

[@CustomHydraulics]

We are glad you found it useful. We'd like to help you more if you any other questions register them here: www.hydraulics.training/ASKAPTLive And we might answer them tomorrow as we are doing live Q&A to answer any Hydraulic questions. We'd love you to join us: facebook.com/events/176497570992728/

[@migueldelgado2217]

Great and clear explanation. Thank you so much.

[@fitzmeister5992]

Well done presentation. Thank you for sharing your knowledge.

[@andrewmawson6897]

A very clear explanation, thank you :)

[@benjamintsebonego]

Very good demonstration and clear simple test. Thanks hips!!!!

[@michaelcostello6991]

Amazing to see. Simple but not obvious !!! Thank you

[@vasylpanasyuk9969]

Thank you very much. Keep up create so easy to understand videos like this

[@michaelslee4336]

I was thinking how would you do the load dropping test on a loose ram on the bench. Bloody hell, my eyes were opened. You get 6 out of 4 points for that demo.

[@redshadow5205]

Nice video. It's very helpful. A month ago, I experienced problem from two of our hydraulic cylinders wiper seal. The seal move out from its groove. Initially, I suspected there is a problem with the alignment or seal design. But later, after thinking and looking for possible cause, I found out maybe the problem is because the flow controller (miter out) at the rod side was throttled or restricted that caused over pressure that pushes the seal out. So, I adjusted the flow controller wider. As of now, I have not encountered the same problem but not 100% if my root cause analysis is correct. Please feel free to give your opinion.

[@SikinderVatturiv]

I love your teaching my friend ❣️.... Lot of thanks 💕

[@beaverone3837]

Excellent video, worth its weight in gold.

[@tawabitjantuek2976]

thank you for your training, plz advise us the leakage criteria as well

[@busyjoe112]

What, why, and how... Excellent!!! Thank You!!!

[@sjefbeekmans8070]

Great way to test a double acting cylinder, is there a similar way to test a single acting cilinder?

[@ricbarker4829]

Brilliant!

[@criswelltawanda3722]

Thank you so much that was very easy to understand

[@rochelleroos7735]

Thanks for the video. i would like to know how would you test a cylinder to see if the barrel is faulty? if you have a video of that please share the link. Thanks

[@trythistv]

Well, this may prove very useful in determining whether my telehandler boom leaking down is a cylinder or a valve to blame. I'm suspecting a valve because there are 4 cylinders to lift the boom, but it is possible that all 4 are leaking slightly I suppose!

[@kendall187]

Is there a situation where this test would fail to diagnose bypass? What if there’s 2 opposing seals on the piston? Could that not create a situation where it would only bypass in one direction?

[@scottalexander9844]

So if there is a cross port check valve included in the circuit before the cylinder, can the cylinder still retract under a weight?

[@despatches5877]

Brilliant. Waiting for coming Videos.... thanks a lot

[@hersheydipped06]

Please tell me how you constructed that test jig. All parts required to build it. Thanks. Great video. I have a Kubota BX24 where the FEL bucket will curl up but when you release the valve handle it quickly drops down.

[@mubarishussain3696]

If you block the piston end. What would the pressure read at the rod and piston. If the cylinder is OK

[@adamsorell4851]

What happens if a cylinder wont move in either direction when working the valve?

[@larrywebber8128]

can you demo test a pto driven pump which has no leaks full oil but does not operate boom on backhoe ?

[@muhamadiqbal7303]

sir, this test applicable for more than one cylinder/piston more?

[@billthompson9595]

WOW! I LEARNED SOMETHING MORE TO DAY, THANK YOU!

[@Boraxo]

Disconnect both hoses and try to compress cylinder, how far will it move ? Try same test with piston seal removed, heck, remove piston all together.

[@F47451]

Does all the quick connector's leaking valve can survive on working pressure?

[@supercocaso]

Excellent video. Thanks!!

[@ronmcbride3768]

Excellent thank you cured a problem for me .

[@davidzedner4286]

Fantastic video!

[@gregjohnson4368]

Great,, Very informative and easy to understand. Thanks

[@q8.eng.abdulrahman558]

Thank you very much for the explanation

[@CustomHydraulics]

You are welcome! Hey, we are doing a live Q&A tomorrow, to answer any questions about hydraulics, if you have any, you may register them here: www.hydraulics.training/ASKAPTLive Join us live here: facebook.com/events/176497570992728/

[@mwambakampamba1030]

Good job👍

[@duanethieme4186]

Great job, thank you for sharing!

[@adeelanwar8199]

Simply genius at work..

[@rickszabo4312]

Just what this doctor ordered ,thank you

[@firewoodtime2]

I think i lost the packing yesterday. I was going to try a different valve in the system which meant disconnecting 4 hoses. Now it's only one. Yaay!

[@elrattyone6316]

I have a log splitter that works perfectly. I wanted to be able to remove the cylinder so that I could move the splitter down a couple flights of stairs. (Basically, I take the splitter apart so that I can manage its weight, all by myself, by taking it down the stairs in pieces.) My solution was to put quick connects onto the in and out ports of the cylinder. The problem I'm having is that the splitter won't work with the quick connects in the line. (Totally locked up... the ram doesn't even move slowly.) Could somebody please explain to me what could be going on here? I'd really like to get this sorted out, as I have to move the splitter semi-regularly. Thank you very much!

[@conormac2010]

Hi just came across your channel, I have a question I know probably won't be simple to answer but will see, I have a hitachi ex60-5, the pump is wining only when using the bucket ram, sometimes the when blading the bucket in the ground when you lift the boom up the bucket slaps open, due to this I got the ram resaled but it's still doing this, would it be a control valve?

[@garyhall867]

Very well explained, Thanks Mate

[@faridmahomed3339]

yap pritty good how do I test prortional directional valve

[@superjulius73]

Wooow I'll do this on my next troubleshooting job.. Helpfull.... Thanks

[@craigkeller]

Great videos! Thank you.

[@pascalausilviu9751]

This video is very helpful. Thanks for sharing:)

[@tuongtrinh4982]

great video

[@kashidasvishwaakarma5073]

thanks explained very well

[@keithkevin6452]

Absolute Genius! well done

[@haimgobin1251]

Continue the good job

[@bapnbird]

Great video!

[@stevecunningham3475]

Nice, So even if the control valve was leaking would this still conclude that the cylinder is leaking simply by taking off the back port and plugging things off ? Please confirm, thanks

[@bigass197]

Well if it's the valve, the cylinder would not move now would it ;) Because even after a leak in the valve the oil has no path to the back of the piston .

[@andykauzlaric6578]

This is a good example of what not to do. Never check a bypass test with the opposite side closed to air.

[@mohamedbadran1645]

when you removed extraction port , do you caped it as presented on blackboard

[@CustomHydraulics]

Hi Mohamed, the hoses and fittings used on this equipment are quick connect fittings, when disconnected, they are automatically capped/closed to prevent fluid flow. This is explained at the 3 minute mark in the video

[@UY_pdr2020]

Excellent video, very informative and educational. What's the name of that auto "leak free" fittings?

[@subcomandante77]

Just quick connects any hydraulic shop should carry them

[@cesargarduno7999]

Right on point, thanks.

[@OHBINEY]

I bought a valve the hose for the valve is 1/2 but that of the cylinder is small how do I determine the the hose for ut

[@samueltaylor4989]

So a brand new cylinder will not move with this test? You are saying the cylinder you show should be rebuilt?

[@Texanfirst727]

Yes, it failed the test.

[@nortonbaum5355]

Is it possible for a double acting cylinder to leak during extend but not during retract? This procedure only test for leaks during retract. How can I test both directions?

[@djtino666]

some cylinder have two seal .. on for each direction .. so the best way to test that is with a flow meter ... if you put the cylinder at the end of travel .. hold the DCV ... and if there is fluid coming out (or in) your seal is leaking

[@Daffodil956]

Thank you

[@engineeruyamottv1077]

I am actually hesiitant if you can use this technique for very large pistons. Can it be? Thanks!

[@CustomHydraulics]

The test method should be ok for larger pistons, the same theory applies, that the bypassing fluid goes around the piston, and then acts on the larger surface area, resulting in the cylinder extending

[@jimjohnson2929]

I have a log splitter that when I hooked it all up the motor starts fine when it's not hooked up to the pump but when I hook it up to the pump involves it down so much that it does not want to start what seems to be the problem here

[@jimjohnson2929]

Please help

[@ejsimpson8270]

Sounds like the oil from the pump is being dead headed causing too much parasitic load for the engine to start.

[@EightiesTV]

Spool valve is not dumping the high pressure side into the tank when the valve is in the neutral position. Could be a broken spring or bent spool keeping the valve stuck in forward or reverse.

[@Formula1-Dave]

Fantastic

[@dgb5820]

That was great

[@waiting4aliens]

what a neat trick thank you

[@oscardominguez6491]

Great teacher, thank you

[@brandodingo6667]

Would this test work in reverse (capping the retraction port) to retract the piston? It seems unlikely considering your demonstration of surface area, but I’m curious. And would either of these tests work under a load? Please respond. Thanks!

[@CustomHydraulics]

Hi Brando, the test method demonstrated will not work in reverse, as you are relying on the pressure operating on the larger surface area to indicate the bypass A cylinder may be bypassing, but if you use this particular test method when the cylinder is under load, or still mechanically pinned at the cylinder ends, the force created by the fluid leaking around the piston will often not be high enough to move that load - the demonstrate method always gives best results when the cylinder is not mechanically linked to your machine. There are other test methods that can be used to indicate cylinder bypass when the cylinder is still connected. :)

[@EightiesTV]

This test will work with either port if both directional seals have failed precisely because the pressure in both ends of the cylinder are equalizing if bypass exists, resulting in an imbalanced force equal to the pressure x the cross sectional area of the rod. It doesn't matter which side the fluid originally came in. If the seals are not sealing, it is the same volume.

[@gordonbournival152]

thanks for the video ,would be possible to do a video on how to bleed the air of cylinder, (backhoe) for me

[@EightiesTV]

Fully extend, fully retract, repeat several times. Air is gone. No video necessary.

[@gordonbournival152]

@@EightiesTV Hi,thanks for the infos but still doing it,if has a load on it, works perfect when it comes to a point of free from load i always got air in the cylinder ,i can move by hands about 4 inches ,was wondering if it can comes from my spool valves,its a block of two joysticks, thanks

[@rocknrolljesus781]

looking to make a press for forging and pressing hot steel. air powered hydraulic bottle jack is too slow. I know by going with an electric motor and hydraulic pump like on a piece of equipment, like crane, backoh, ect... is the way to go. any thoughts on how to get 15 to 30 tons of pressure with the speed I see in your vidoes. am I on the right track with electric motor and a hydraulic pump system. does piston size matter on cylinder, and what about motor and pump size. forever grateful M. Weber

[@EightiesTV]

With a 2-stage pump like the ones used on log splitters.

[@mrbeltr5833]

Nice 👍

[@joneginnesh2748]

Thanks friend

[@croexcavator]

great ✔✔✔👍👍👍

[@haimgobin1251]

Very good thank you

[@simpliciocamirino2271]

Thank for that sharing sir.

[@supunkirihetti]

Bro Where are you from,,

[@duanesharpjr9512]

What about a cylinder that only has one hydraulic hose

[@pmdeal]

thanks That was great!!!!!!!!!!!!!!!!!!!!!!!!!!

[@donaldmoody9561]

Well done thanks.

[@AmirhosseinJamalian]

Useful

[@sajjadahmed7375]

Lot of love

[@rockiemountin7535]

Great info thanks

[@DigitalHydraulics-AEMETECCoLtd]

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[@gajetoni]

Very smarts 👍

[@westernstar4964]

Brilliant

[@Hcaner-oq3kk]

Makes sense thanks

[@kanekane6273]

what makes a cylinder act spongee

[@jontheroofer1968]

kane kane air in the cylinder for one