Dear AvE, your videos have kept me interested in engineering and thus lead me to my degree. You are just the best. Thanks for putting all the work you do into these videos, man!
I'm in first year HET and we just started taking little hydraulic pumps apart last week to measure the displacement and whatever, good timing for this video! Also, I think that's cool that you can flip the input shaft around in case your pump needs to be driven the other way.
Glad you mentioned cavitation. Put your hand underwater and move it from one side to the other really fast. A vacuum pocket will form behind the hand that you can easily see. There's no air in there, but it is a cavity. I have also seen the inlets being pressurized to reduce cavitation. The highest I saw was 100-PSI, and that was on a 3000-PSI system. Great vidya, my friend...
I like the cavitation talk. Ive seen the end results of water cavitating a diesel injection pump quite a few times. They love to send steel glitter all through the fuel system as the pump detonates slowly.
I never really thought about the details of a gear pump and falsely assumed that the oil goes through the middle part, but had been wondering how it would do that as the cavity is pretty small there. Doh. That the oil goes _around_ the outer diameter makes much more sense. #TIL. Your vijeos are a source of interesting information. Skookum as frick. Thanks!
never thought about it until seconds before he was explaining it, but I too assumed the flow would go through the middle. which makes absolutely no sense in retrospect
I always imagined the closing in teeth would pressurise the oil (although the oil doesn't change in volume very much at all unlike with compressed air) with some leakage but yes going around the outside makes more sense.
The ISO code on the pump body is stamped "P " for pump or "M" for motor , Motors also usually have a case drain port.it would appear someone has swapped the rotation group to change direction. You have a pump in this clip as indicated by the seals on the thrust plates ,a motor is bidirectional and the thrust seals seals are figure 8 shaped .
Moe7404. i worked industrial hydraulics for 20 years. now retired. that demo was the best that subject could EVER be done. the part about pump or motor is a point that even a lot of people that work on them dont even understand
I to work in the hydraulics industry and it does catch a lot of people out. What he stripped down was actually a pump tho because of the 2 different sized ports and the kidney plate seal only sealing off the high pressure side. Some pumps like commercial brand actually run a full seal around the shaft like a motor has but the ports are the give away.
Ist a one directon motor wich needs the sealing only on the higpressure side an a lekage flow from the bearings spots to the Tank side The actuator is labeld as a Motor also Greetings from germany
The cut out pieces on the gear side of the bearing holder only allow oil to escape back out into the side of the pump that it came from. Because the groves don't break into where the bearings are. The groves on top do look like they allow the high pressure oil into the bearings. I think this makes sense because if the oil was flowing in and out of the bearings it would not be at as high a pressure. Also I love your channel, and I wish I had lecturers like you at uni.
Got a university report on gear pumps and was getting bored of my tutors long winded vijeos without any swearing. Glad I remembered you made a video on these!
As someone who lives in a former colonial outpost, the easiest way to tell imperial fasteners in my garage is by the rounded heads from using metric tools on them...
Another well tested method. Eyeball the fastener, and select the tool you are absolutely certain will fit it.. if you selected metric.. it will be imperial... and if you selected imperial it will be metric. Uncanny.. works every time for me.
Put my 48 Ford 8N into a tree stump, cracking my loader pump case earlier this year. Had to self learn everything you just showed. This filled in some lingering gaps of knowledge from that day.
I am a mechanic for a company which specializes in truck mounted material handling loaders (primarily logs) ran completely by a gear pump mounted to an eaton pto on the underside of the truck transmission and driven by the input shaft of the transmission, typically when we see symptoms of a tired pump we only replace pumps, not disassemble and repair. This vidjayo defintely helped me understand a little more of the witchcraft that goes on inside these pumps
Those pumps are designed to wear into itself. The gears eat into the housing at break-in making its own clearance. You will always see wear in the housing. The wear is on the low pressure side. High pressure pushes toward low pressure. If the wear goes past the housing locating pins to the high pressure side it is worn out. If you replace the bearings, you reset where the gears are at in the housing and you have internal leakage. Thanks for the vid, sorry my comment is a year late.
Excellent, I have been trying to figure out why my pump wont build pressure and heats up quickly, after reversing the rotation I didn't get the excess fluid diverter in the correct orientation, works great now, thanks!!!!
Your videos helped me fix my ingersol-rand impact now its helping me understand pto’s that i work with daily better. You got one for everything dont ya
Only positive displacement pumps create flow. Centrifugal pumps create pressure. Correct me if I'm wrong, but I'm fairly certain, and this makes intuitive sense when considering the high clearance provided in most impeller pumps, and the low clearance in positive displacement pumps like gear pumps or reciprocating pumps.
Very interesting. From the automotive mechanic side is always throught it squeezed through the middle. This makes more sense now that i see you explain it.
I keep waiting for the day when I'm going to need something I learned here at work. I work in the wireless internet industry, so there's not many hydraulic pumps and such, but some day!
I was always under the impression that hydraulic motors had the same size ports on either side, so that the motor would spin the same speeds in either direction. Then hydraulic pumps normally had the larger size for suction and the smaller size for pressure, depending on the application.
Upon seeing the Craftsman wrench, I had to go into the toolbox for the crucifix and hold it up to the screen. Thoroughly shaken, I then called my Snap-On dealer for further support.
yeah and when she breaks and the guy doesn't show up for a month. fuck that! nawh any way if hes like most of us here hes probably got at least 4 11/16" wrenches. Plus the ones hes had to fuck up to change that one hose jammed up at the back to the valve body some some obscure obsolete machine.
"Before I was rudely interrupted by the truth" has to be up there with one of your best lines. Copyright it quick before it becomes a US presidential campaign slogan.
After hearing you talking about pressure and flow, I wish you would do a few videos just on the basics. Kinda like what you would see in those old education film from like the 40's. Because without a doubt you're knowledgeable enough to get the info right, and I feel you would easily be able to put it all in layman terms.
Great video, your ability to explain relatively complex workings is second to none. I was going to ask your option on a brand of tool the other day and bam there it was, what do you think about porter cable?
Thanks man. Very in-fkn-formative. I had to replace the oil pump in my car about 20 years ago and for whatever reason I thought about gear pumps and watched your vid. Great job, good info.. Thanks again.
Many Fire Engines use a gear pump attached to an electric starter motor as "primer". The gear pump is used to create a vacuum in the body of the main rotary pump (with the help of a little spritz of oil on the gears) to get the air out of it and flood water into it (from a the tank, a hydrant or a pool/pond). The gear pump is also used to test for leaks in the pump and manifolds valves by creating a vacuum which must be maintained when the primer it turned off (which is why the main gauges go into negative pressure on the panel).
Absolutely. I am not any kind of engineer, and I learn a lot from his vids. He drops gold nuggets of information without even knowing it sometimes I think.
They might have explained it just as well in high school but, at the time, you no interest or little experience in the topic. That is, the teacher's ability to teach isn't that much different from AVE but you, with your age and experience, are different.
What drives hydraulic pump and the pump creates pressure, that pressure is determined by the circuits resistance to the flow of the oil passing through it, where that occurs determines the nominal (required) pressure, and the max or stall pressure. The resistance in the lines orifice fitting filter or valve will determine nominal pressure (the pressure that occurs in the lines when the force driving the pump meets the opposing force (friction) enough pressure builds up to either overcome the resistance or bypass the circuit through the relief valve, of the system is functioning as intended then the H/F starts to transfer the pumps mechanical input to the motor, (pressure and flow) setting the motor into motion and the fluid into the return line.
oh and the bearing cut out bits are also to ensure there is flow of new oil past the bearings to keep them cool and lubricated. I dunno if you can get your hands on a variable displacement piston pump, but them things are pretty cool as far as pumps go. we use them in our manlifts for the drive circuit.
I wish I would have watched this 6 years ago. I now understand why a Melling oil pump for a small block Chevy has the pressure relief valve and how it controls bearing pressure and yes, it dumps into the crankcase. It contains no o-ring so the design is simpler and works for the needed pressure. KUDOS! As an aside, modern engine machining now uses plateau honing with deep scratches and a finish that is smoothed for the piston rings to seal "against" and the ring seal is the oil, not the pressure. You want no contact between the 2. This is why modern pistons rings live longer. Better seal, less emissions, more power, longer life. Rediscovered by the diesel crowd that make extremely high horsepower. Can you say RVK meter?
I love how you explain the details. In a previous life I installed CNC machining center’s one client was Worthington pumps. They built hydraulic pumps with herring bone meshing gears. Later on in life I flew airliners and on the MD DC- 9 airplane the engines Pratt and Whitney of course JT 8-9 the hydraulic pumps where variable displacement pumps that used a wobble plate to adjust required pressure. I really enjoy your videos. May ask what is your background as in what did you do for a living? You have a wonderful understanding of so many subjects. 😁🛫
I learn so much useful stuff from these videos. Shortly after you cause me to develop the question "how does something that, by definition, when it is working, is always in a pressurized oil bath, come to experience failure?" you answer the question.
I actually just watch this because it's entertaining and interesting. I don't think I'll ever be using a hydraulic gear pump in my life. But I'll be damned if I don't say that I enjoy the shit out of your videos.
Wow.. Thank you very much for this informative video ... it helped me understand so many things, and now I can reassemble my micro gear pump for the 1/16 Hydraulic wheeled loader :) ... Awesome Video !!
@6:50 the seal needs only one lip to seal the second seallip is for dust. The Most Motors have a leakeoil port the Port is for reversal use in this case the motor can only be used in one direction
quick question on the backup plate for that lip seal, how exactly does it work to make that 15psi seal hold up to 3000psi? does it just add force back on the lip to keep it from folding over? the reason I'm asking is because my truck has an 87 cummins diesel engine from a Komatsu excavator and they are equipped with a rotary pump with a front lip seal. now normally that lip seal is no big deal because it's just sealing a low pressure vane pump inside the injection pump itself, and is usually only fed up to 12 psi or so. But when people go to bumping up the pumps it gets to be necessary to start upping the pressure of the fuel supply to help keep the pump supplied with fuel and keep the dynamic timing working. But upping the inlet pressure starts to leak past the seal at around 18psi. so what I'm asking is, can you send me a drawing or make a quick video of how that backup plate on the seal is keeping that much pressure in so I can some how make my truck go faster and not fill the crank case with diesel fuel? lol thanks in advance!
The seals don't seal anywhere near 3000 psi ,he's wrong about that 50 to 150 psi is considered high in a pump or motor, the rotation group of the pump directs all high pressure flow to the outlet port it's only a small amount of bypass leakage that gets to the shaft seal to lube the bearings ,heat is far bigger problem for an engine mounted pump like yours, we fit Viton shaft seals to cope with that ,I've had 30 years experience working in the commercial hydraulic industry BTW.
Great video! Could you possibly do a video of the internal workings of a hydraulic pump/motor and how it transitions between the two functions? Thanks!
best video for a long time, seems to me you love the shmoo more than electrocity. Do a gerotor pump some time when you have time. Some engine oil pumps are that type. And don't get your lump stuck in the pump..
thank you so much for your help, u taught me so much I needed to know if a pump could run either way all I have to do is flip the gears wow thanks again
You know what ... to your surprise I have a bachelor degree in mechanical engineering , I remember studying what you said in college .. but I suppose only now I've completely understood what was going on :)) ... Thank you
This is so true, and so many people miss this, you have to have a stoppage to create pressure. The pressure is what does the work, but you need resistance. Almost exactly the way electricity works oddly enough.
If I'm not mistaken sysyemic pressure does not change the vapor pressure of a liquid. Vapor pressure is effected by temperature. I think what you meant to say was that as systemic pressure drops and converges with the vapor pressure of the oil it will begin to boil causing the pump to capital. Keep up the good work man I love your videos.
That doesn't sound right - the effect should be dependent on the vapor pressure of the fluid. The bubble collapse does occur at the fluid's speed of sound, though.
@hans the speed of sound waves differs among different materials. high density materials transfer concussion waves faster than low density materials, hence the speed of sound is faster in water than it is in air. grade 4 science ftw
let's do some math, speed of sound in air 340 m/s , a pump gear diameter 25 mm (a big pump )and so 340 /(3.14 *.025) * 60 = 259 872 rpm if you divide that by 1500 rpm or 1800 rpm you find that it is around 173 ~ 144 fold just saying .
@fawzan if I'm reading this correctly I think your reasoning is flawed. you're assuming speed of sound in air, at sea level, through the gear. what's flowing through the gear is oil under negative pressure. as AvE said the oil can boil, now I'm not an inganeer or a math magician, but it stands to reason that the density inside the gear is very different from oil at 1 atmosphere of pressure. now I have been wrong once or twice, and could very well be again, but my previous point was to explain "speed of sound of a fluid".
Nice vid. There is one more way to say what way should the pump turn. You just check how the seals on the sealing elements are fitted. The high pressure part is divided from the low pressure so just by telling which part is which you can tell if the pump is cw or ccw.
I use used small pumps on drills or mounted to a motor to function as a viscus fluid pump. If you ever filled a transmission from the bottom of a vehicle, this will make sense. At low pressure, these will pump 140W oils no problem. Another fun point of using these as viscus fluid pumps, flip your motor or drill into reverse and it changes the direct of the fluid (put too much in scenario). Yes at low pressure a battery operated drill will run these with no issues.
... and a bigger version bloximages.newyork1.vip.townnews.com/energy-tech.com/content/tncms/assets/v3/editorial/d/b3/db3ca91e-0637-11e6-97cb-dffd69c367a4/57163b7e13c8d.image.jpg?resize=1200%2C1600
If you have access to an ultrasonic cleaner (and who doesn't)... pop in a bit of tinfoil and clean it to death.. Tiny holes will appear, caused by cavitation. Also check out -> --lmh.epfl.ch/page-57977-en.html--
the plate with the seals in is teh specticle plate, and some pumps have a grub screw in them that has to be changed too when changing the rotation of the pump. Not sure why, but when i turned the rotation of a pump at work i fulled a truck gearbox up with hydrolic oil threw the pto LOL! thanks for the vid, i didnt know what the bits did on the specticle plate
I work on PC-400 excavators. They have a dual set variable displacement piston pump. To stop cavitation they build the pump with a centrifugal primary pump on the inlet side to somewhat pressurize the oil before the piston section. I thought that was a good idea to make up for a lot of bad ideas that Komatsu has.
Thanks for the explanation. I've mistakenly thought that the pump moved oiled through the mesh of the gears. The first thing I thought when you opened it was how does the oil move through such a close mesh. Now it makes perfect sense that it doesn't and in retrospect it was a little stupid to think that it did...
I've been in the logistic industry for about 18 years in various positions, so I've operated a crap-ton of different material handling equipment over the years. Something I've noticed with electric forklifts is the older (I'm talking electric trucks here) is the pump would always operate at one speed, ie balls-to-the-wall, no matter how much action you selected on one of your levers. I'm guessing the excess oil was being diverted back to the res via your valve block, but that's a bit redundant. The newer machines seem to not only have control-by-wire, but the pump only works as much as required, none of that sudden motor noise when you just want to move something by a hair.
Dear AvE, your videos have kept me interested in engineering and thus lead me to my degree. You are just the best. Thanks for putting all the work you do into these videos, man!
Good work m8. Gratz on your degree =D
Cheers to that. Very cool you found that inspiration
Same story with me but ima machinist 🙃
I'm in first year HET and we just started taking little hydraulic pumps apart last week to measure the displacement and whatever, good timing for this video! Also, I think that's cool that you can flip the input shaft around in case your pump needs to be driven the other way.
Aliminyum , ana gövdeyi ters cevirmesi gerekir , yön degişikligi için
Impeccable explanation! And I love how you stress the flow/pressure distinction.
I absolutely love these kind of videos. Nothing beats the hands on explaining. Please keep these up!
Hahaha, I laughed way too hard at the click of the tourque wrench. I'm guessing you tourqued it to FT (fucking tight)
Jeff from elderly iron has the same torque wrenches...
me too lol
It took some learning growing up to stop at that click before the fastener said "Ting", and my knuckles chimed in.
FFT. That's Full Fucking Tight, for you. Any tighter and you get stripping.
GOOD-'EN-TIGHT. Yah .
Glad you mentioned cavitation. Put your hand underwater and move it from one side to the other really fast. A vacuum pocket will form behind the hand that you can easily see. There's no air in there, but it is a cavity. I have also seen the inlets being pressurized to reduce cavitation. The highest I saw was 100-PSI, and that was on a 3000-PSI system. Great vidya, my friend...
I like the cavitation talk. Ive seen the end results of water cavitating a diesel injection pump quite a few times. They love to send steel glitter all through the fuel system as the pump detonates slowly.
I've never even considered engineering until i came across your channel a couple years ago. Glad you can share joy of machining with us common folk.
Your hydraulic videos is how I discovered you, your infrared heat gun trick is worth its weight in gold. Keep up the great info.
I never really thought about the details of a gear pump and falsely assumed that the oil goes through the middle part, but had been wondering how it would do that as the cavity is pretty small there. Doh. That the oil goes _around_ the outer diameter makes much more sense. #TIL. Your vijeos are a source of interesting information. Skookum as frick. Thanks!
never thought about it until seconds before he was explaining it, but I too assumed the flow would go through the middle. which makes absolutely no sense in retrospect
N
I always imagined the closing in teeth would pressurise the oil (although the oil doesn't change in volume very much at all unlike with compressed air) with some leakage but yes going around the outside makes more sense.
Henner Zeller
I made the same assumption
11/16 wrench on a metric bolt. Never change AvE...
ha..it is a crapsman wrench tho
Just 0.46mm too large, doesn´t matter that much on 12.9 bolts, they´re hard stuff.
If the Crapsman dies on it, who cares?
Wasn't a wrench it's a torque device....lol
I use 3/4 for 19mm and 5/8 for 16 all the time, call me a rebel.
it's 11/16 of the proper torque
Just picked up a little scrap honor pump from work that I'm gonna disassemble and attempt to fix. Your videos definitely helped get me interested!
Aliminyum ana gövdede çizik varsa o pompa ölüdür , bogaz keçesi yada gözlüklerde, keçelerde problem varsa belki kurtarırsın pompanı .
You're a knowledgeable man! And i'm glad to learn something new from you every video!
Hydaraulik relef valve
Relef valve experience
The ISO code on the pump body is stamped "P " for pump or "M" for motor , Motors also usually have a case drain port.it would appear someone has swapped the rotation group to change direction. You have a pump in this clip as indicated by the seals on the thrust plates ,a motor is bidirectional and the thrust seals seals are figure 8 shaped .
You have a great deal of knowledge telling the difference between the two. You should have a RUclips channel.
@@dukeman7595 I run a hydraulic repair business.
This video given me the exact knowledge that I need to know now a days for my project. Lot of thanks for uploading such a brilliant effort.
Moe7404. i worked industrial hydraulics for 20 years. now retired. that demo was the best that subject could EVER be done. the part about pump or motor is a point that even a lot of people that work on them dont even understand
I to work in the hydraulics industry and it does catch a lot of people out. What he stripped down was actually a pump tho because of the 2 different sized ports and the kidney plate seal only sealing off the high pressure side. Some pumps like commercial brand actually run a full seal around the shaft like a motor has but the ports are the give away.
Ist a one directon motor wich needs the sealing only on the higpressure side an a lekage flow from the bearings spots to the Tank side
The actuator is labeld as a Motor also
Greetings from germany
Moe Shouse I have an old backhoe and not really any power or force when I’m using the backhoe part. Would it be a bad pump?
The cut out pieces on the gear side of the bearing holder only allow oil to escape back out into the side of the pump that it came from. Because the groves don't break into where the bearings are. The groves on top do look like they allow the high pressure oil into the bearings. I think this makes sense because if the oil was flowing in and out of the bearings it would not be at as high a pressure. Also I love your channel, and I wish I had lecturers like you at uni.
Got a university report on gear pumps and was getting bored of my tutors long winded vijeos without any swearing. Glad I remembered you made a video on these!
As someone who lives in a former colonial outpost, the easiest way to tell imperial fasteners in my garage is by the rounded heads from using metric tools on them...
Another well tested method. Eyeball the fastener, and select the tool you are absolutely certain will fit it.. if you selected metric.. it will be imperial... and if you selected imperial it will be metric. Uncanny.. works every time for me.
If it's an American car either might fit, if it's a Japanese car metric tools will fit but you hands won't!
Hey... let's all switch to metric! And let's put the steering wheel on the left side as well, while we're at it!
Put my 48 Ford 8N into a tree stump, cracking my loader pump case earlier this year. Had to self learn everything you just showed. This filled in some lingering gaps of knowledge from that day.
I am a mechanic for a company which specializes in truck mounted material handling loaders (primarily logs) ran completely by a gear pump mounted to an eaton pto on the underside of the truck transmission and driven by the input shaft of the transmission, typically when we see symptoms of a tired pump we only replace pumps, not disassemble and repair. This vidjayo defintely helped me understand a little more of the witchcraft that goes on inside these pumps
I can’t believe that it’s almost six years since I first watched this video. It’s still great to watch now. Thanks.
I love how you go into detail on how to verify that it's a metric bolt and then you wail on it with an 11/16 wrench. You can't script gold like that.
Celeb reply here!! Sorry it took me 4 years to notice...
Those pumps are designed to wear into itself. The gears eat into the housing at break-in making its own clearance. You will always see wear in the housing. The wear is on the low pressure side. High pressure pushes toward low pressure. If the wear goes past the housing locating pins to the high pressure side it is worn out. If you replace the bearings, you reset where the gears are at in the housing and you have internal leakage. Thanks for the vid, sorry my comment is a year late.
Hello. Is it possible to buy these bearings as spare parts?
Very clear good views,explanation,and comprehensive language;as much as vocabulary,u can tell the speaker knows what’s an hydraulic component
I just had to rebuild one of these on my PTO for my wrecker, and damn. This knowledge is great.
Excellent, I have been trying to figure out why my pump wont build pressure and heats up quickly, after reversing the rotation I didn't get the excess fluid diverter in the correct orientation, works great now, thanks!!!!
Your videos helped me fix my ingersol-rand impact now its helping me understand pto’s that i work with daily better. You got one for everything dont ya
I was looking for a repair video on hydraulic pumps and you came up! VERY COOL! I love your videos! Thanks!
Only positive displacement pumps create flow. Centrifugal pumps create pressure. Correct me if I'm wrong, but I'm fairly certain, and this makes intuitive sense when considering the high clearance provided in most impeller pumps, and the low clearance in positive displacement pumps like gear pumps or reciprocating pumps.
I learned more in 10 minutes regarding the workings of a hydraulic pump/motor than I ever did watching RUclips videos.
Very interesting. From the automotive mechanic side is always throught it squeezed through the middle. This makes more sense now that i see you explain it.
I keep waiting for the day when I'm going to need something I learned here at work. I work in the wireless internet industry, so there's not many hydraulic pumps and such, but some day!
Think you should find some vajayos that’s apply to your needs friend
I was always under the impression that hydraulic motors had the same size ports on either side, so that the motor would spin the same speeds in either direction. Then hydraulic pumps normally had the larger size for suction and the smaller size for pressure, depending on the application.
I was so pumped for this video
Upon seeing the Craftsman wrench, I had to go into the toolbox for the crucifix and hold it up to the screen. Thoroughly shaken, I then called my Snap-On dealer for further support.
How many easy payments did that cost ya?
+Marcel LeMay Lmao! touché brother.
yeah and when she breaks and the guy doesn't show up for a month. fuck that! nawh any way if hes like most of us here hes probably got at least 4 11/16" wrenches. Plus the ones hes had to fuck up to change that one hose jammed up at the back to the valve body some some obscure obsolete machine.
some would say the real measure of a man is how many combination wrenches he has cut in half and/or welded into funky angles
So hydraulics are the big boy version of wimpy pneumatics? :-)
"Before I was rudely interrupted by the truth" has to be up there with one of your best lines.
Copyright it quick before it becomes a US presidential campaign slogan.
After hearing you talking about pressure and flow, I wish you would do a few videos just on the basics. Kinda like what you would see in those old education film from like the 40's. Because without a doubt you're knowledgeable enough to get the info right, and I feel you would easily be able to put it all in layman terms.
Had to re build a couple of those last winter, i had absolutely no idea how they worked but somehow the re builds went good
I always wondered about the IN's and OUT's of a Hydo pump.... and now I even know the in-between's.
I love you man. I never seen such an explanation like this for gear pumps. neither in books.
Om Gosh Ave...
You have a video for everything.
What is it that you do for a living?
You're a genius.
Great video, your ability to explain relatively complex workings is second to none. I was going to ask your option on a brand of tool the other day and bam there it was, what do you think about porter cable?
Thanks man. Very in-fkn-formative. I had to replace the oil pump in my car about 20 years ago and for whatever reason I thought about gear pumps and watched your vid. Great job, good info.. Thanks again.
I appreciate your clear explanation and good reasoning.you are professional. Thankyou for sharing without holding any secrets.
Many Fire Engines use a gear pump attached to an electric starter motor as "primer". The gear pump is used to create a vacuum in the body of the main rotary pump (with the help of a little spritz of oil on the gears) to get the air out of it and flood water into it (from a the tank, a hydrant or a pool/pond).
The gear pump is also used to test for leaks in the pump and manifolds valves by creating a vacuum which must be maintained when the primer it turned off (which is why the main gauges go into negative pressure on the panel).
I love how you can explain shit better in a few minutes than 3 weeks of high school ever did..
Absolutely. I am not any kind of engineer, and I learn a lot from his vids. He drops gold nuggets of information without even knowing it sometimes I think.
They might have explained it just as well in high school but, at the time, you no interest or little experience in the topic. That is, the teacher's ability to teach isn't that much different from AVE but you, with your age and experience, are different.
That's because in high school teacher are only theorists they have no idea how stuff works in real life ...
What drives hydraulic pump and the pump creates pressure, that pressure is determined by the circuits resistance to the flow of the oil passing through it, where that occurs determines the nominal (required) pressure, and the max or stall pressure. The resistance in the lines orifice fitting filter or valve will determine nominal pressure (the pressure that occurs in the lines when the force driving the pump meets the opposing force (friction) enough pressure builds up to either overcome the resistance or bypass the circuit through the relief valve, of the system is functioning as intended then the H/F starts to transfer the pumps mechanical input to the motor, (pressure and flow) setting the motor into motion and the fluid into the return line.
oh and the bearing cut out bits are also to ensure there is flow of new oil past the bearings to keep them cool and lubricated. I dunno if you can get your hands on a variable displacement piston pump, but them things are pretty cool as far as pumps go. we use them in our manlifts for the drive circuit.
"You're gonna have schmoo blasting in your face like last Saturday night" --AVE
Fukken pure gold buddy
+AvE I like this new frequency of video releases. Keep it up!
This is awesome , im taking a hydraulic design course right now so this is at a perfect time!
I wish I would have watched this 6 years ago. I now understand why a Melling oil pump for a small block Chevy has the pressure relief valve and how it controls bearing pressure and yes, it dumps into the crankcase. It contains no o-ring so the design is simpler and works for the needed pressure. KUDOS!
As an aside, modern engine machining now uses plateau honing with deep scratches and a finish that is smoothed for the piston rings to seal "against" and the ring seal is the oil, not the pressure. You want no contact between the 2. This is why modern pistons rings live longer. Better seal, less emissions, more power, longer life. Rediscovered by the diesel crowd that make extremely high horsepower. Can you say RVK meter?
he hydrulic lessons are worth the patreon, the boltr's are gravy. thx for welcoming us into your shop, sorry about the occasional riff raff
It's a lawnmower supercharger.
Does that mean it force-feeds grass into the blade?
Like how I put USB cords into the plugs.
"God damn it! TAKE IT!"
+Dav5id Buschhollll
just stumbled upon this channel, 2nd video in. I knew right away this guy is smart and funny. Keep up the good work!
I love how you explain the details. In a previous life I installed CNC machining center’s one client was Worthington pumps.
They built hydraulic pumps with herring bone meshing gears. Later on in life I flew airliners and on the MD DC- 9 airplane the engines Pratt and Whitney of course JT 8-9 the hydraulic pumps where variable displacement pumps that used a wobble plate to adjust required pressure.
I really enjoy your videos. May ask what is your background as in what did you do for a living? You have a wonderful understanding of so many subjects. 😁🛫
Haha "click". Totally torqued to spec like a boss.
Very education and accurate. This helped me to understand the K46AC transmission. Thanks
I learn so much useful stuff from these videos. Shortly after you cause me to develop the question "how does something that, by definition, when it is working, is always in a pressurized oil bath, come to experience failure?" you answer the question.
It is really fascinating to see the inside of the gear pump!! Thanks for the video
i feel ave knows me, i do roll my own smokes and can kickstart a harley
but are you female?
was that aimed at the od female in the crowd then? didn't notice that xD
Quit smoking, roll a joint and switch to enduro (dual sport).
I actually just watch this because it's entertaining and interesting. I don't think I'll ever be using a hydraulic gear pump in my life. But I'll be damned if I don't say that I enjoy the shit out of your videos.
Wow.. Thank you very much for this informative video ... it helped me understand so many things, and now I can reassemble my micro gear pump for the 1/16 Hydraulic wheeled loader :) ... Awesome Video !!
Very loud and clear, thanks for sharing this information
@6:50 the seal needs only one lip to seal the second seallip is for dust.
The Most Motors have a leakeoil port the Port is for reversal use in this case the motor can only be used in one direction
quick question on the backup plate for that lip seal, how exactly does it work to make that 15psi seal hold up to 3000psi? does it just add force back on the lip to keep it from folding over?
the reason I'm asking is because my truck has an 87 cummins diesel engine from a Komatsu excavator and they are equipped with a rotary pump with a front lip seal. now normally that lip seal is no big deal because it's just sealing a low pressure vane pump inside the injection pump itself, and is usually only fed up to 12 psi or so. But when people go to bumping up the pumps it gets to be necessary to start upping the pressure of the fuel supply to help keep the pump supplied with fuel and keep the dynamic timing working. But upping the inlet pressure starts to leak past the seal at around 18psi.
so what I'm asking is, can you send me a drawing or make a quick video of how that backup plate on the seal is keeping that much pressure in so I can some how make my truck go faster and not fill the crank case with diesel fuel? lol
thanks in advance!
The seals don't seal anywhere near 3000 psi ,he's wrong about that 50 to 150 psi is considered high in a pump or motor, the rotation group of the pump directs all high pressure flow to the outlet port it's only a small amount of bypass leakage that gets to the shaft seal to lube the bearings ,heat is far bigger problem for an engine mounted pump like yours, we fit Viton shaft seals to cope with that ,I've had 30 years experience working in the commercial hydraulic industry BTW.
Great video! Could you possibly do a video of the internal workings of a hydraulic pump/motor and how it transitions between the two functions? Thanks!
Hey man, I hope you see this. I just wanted to say I love your videos.
Very fun and educational. Some of the best entertainment on youtube.
Chooch.
Caught myself copying your hand movements while explaining some very techy stuff to a customer. Thanks! ;-)
best video for a long time, seems to me you love the shmoo more than electrocity. Do a gerotor pump some time when you have time. Some engine oil pumps are that type. And don't get your lump stuck in the pump..
thank you so much for your help, u taught me so much I needed to know if a pump could run either way all I have to do is flip the gears wow thanks again
Sir, you have a way of breaking down high end knowledge to my level. Also, I can't stop saying chooch or skookum. Thanks!
You know what ... to your surprise I have a bachelor degree in mechanical engineering , I remember studying what you said in college .. but I suppose only now I've completely understood what was going on :)) ... Thank you
I am a comp sci student with literally zero experience in anything mechanics related, yet I still enjoy the hell out of these vijayos
This is so true, and so many people miss this, you have to have a stoppage to create pressure. The pressure is what does the work, but you need resistance. Almost exactly the way electricity works oddly enough.
Thank you Mr. AvE for detail explanation.
If I'm not mistaken sysyemic pressure does not change the vapor pressure of a liquid. Vapor pressure is effected by temperature. I think what you meant to say was that as systemic pressure drops and converges with the vapor pressure of the oil it will begin to boil causing the pump to capital. Keep up the good work man I love your videos.
cavitation is not from boiling, but from moving a surface in contact with the fluid faster than the speed of sound of the fluid.
That doesn't sound right - the effect should be dependent on the vapor pressure of the fluid. The bubble collapse does occur at the fluid's speed of sound, though.
+Hans the speed of sound is different in all materials.
@hans the speed of sound waves differs among different materials. high density materials transfer concussion waves faster than low density materials, hence the speed of sound is faster in water than it is in air. grade 4 science ftw
let's do some math, speed of sound in air 340 m/s , a pump gear diameter 25 mm (a big pump )and so
340 /(3.14 *.025) * 60 = 259 872 rpm
if you divide that by 1500 rpm or 1800 rpm you find that it is around 173 ~ 144 fold
just saying .
@fawzan if I'm reading this correctly I think your reasoning is flawed. you're assuming speed of sound in air, at sea level, through the gear. what's flowing through the gear is oil under negative pressure. as AvE said the oil can boil, now I'm not an inganeer or a math magician, but it stands to reason that the density inside the gear is very different from oil at 1 atmosphere of pressure. now I have been wrong once or twice, and could very well be again, but my previous point was to explain "speed of sound of a fluid".
Great video, and great style. 10/10!
Thanks for making it humorous too.
Nice vid. There is one more way to say what way should the pump turn. You just check how the seals on the sealing elements are fitted. The high pressure part is divided from the low pressure so just by telling which part is which you can tell if the pump is cw or ccw.
Very Good man! I’ve learned a lot in so little time! Thank you.
You are off your rocker.....I love it and the smoo is seeping in....thanks for the enlightenment.
thanks for helping my hangover with your soothing video
I use used small pumps on drills or mounted to a motor to function as a viscus fluid pump. If you ever filled a transmission from the bottom of a vehicle, this will make sense. At low pressure, these will pump 140W oils no problem. Another fun point of using these as viscus fluid pumps, flip your motor or drill into reverse and it changes the direct of the fluid (put too much in scenario). Yes at low pressure a battery operated drill will run these with no issues.
Thanks for the explanation. Brilliant.
You explain things brilliantly. Any chance you could you could get to England by tomorrow and teach my auxiliary course?😩
Do you have any examples of cavitation damage? I'd like to see what that looks like up close.
It Kinda looks like it has been sandblasted ;)
bloximages.newyork1.vip.townnews.com/energy-tech.com/content/tncms/assets/v3/editorial/d/b3/db3ca91e-0637-11e6-97cb-dffd69c367a4/57163b7e13c8d.image.jpg?resize=300%2C400
... and a bigger version bloximages.newyork1.vip.townnews.com/energy-tech.com/content/tncms/assets/v3/editorial/d/b3/db3ca91e-0637-11e6-97cb-dffd69c367a4/57163b7e13c8d.image.jpg?resize=1200%2C1600
If you google cavitation damage you will see all sorts of damage pics from props, pumps, impellers etc. It is quite a fascinating failure mode.
If you have access to an ultrasonic cleaner (and who doesn't)... pop in a bit of tinfoil and clean it to death.. Tiny holes will appear, caused by cavitation. Also check out -> --lmh.epfl.ch/page-57977-en.html--
the plate with the seals in is teh specticle plate, and some pumps have a grub screw in them that has to be changed too when changing the rotation of the pump. Not sure why, but when i turned the rotation of a pump at work i fulled a truck gearbox up with hydrolic oil threw the pto LOL!
thanks for the vid, i didnt know what the bits did on the specticle plate
I've been taking things apart since I was 5, and I gotta say I love your channel, even if you are Canadiene. Keep it up
how are you so fucking good at explaining things, you need to write books and force them upon us all
I work on PC-400 excavators. They have a dual set variable displacement piston pump. To stop cavitation they build the pump with a centrifugal primary pump on the inlet side to somewhat pressurize the oil before the piston section. I thought that was a good idea to make up for a lot of bad ideas that Komatsu has.
Thanks for the explanation. I've mistakenly thought that the pump moved oiled through the mesh of the gears. The first thing I thought when you opened it was how does the oil move through such a close mesh. Now it makes perfect sense that it doesn't and in retrospect it was a little stupid to think that it did...
Best explanation ever. Thank you.
know what?youre my favorite youtuber from now on..more power to your channel.
I like how simple and straightforward it is
Such a good video, so much simple and good information I immediately paused and took notes in my notepad app.😎👍💯
So pressure is torque and flow is horsepower. Gotcha. Thanks for all the videos! I've learned a lot!
I've been in the logistic industry for about 18 years in various positions, so I've operated a crap-ton of different material handling equipment over the years. Something I've noticed with electric forklifts is the older (I'm talking electric trucks here) is the pump would always operate at one speed, ie balls-to-the-wall, no matter how much action you selected on one of your levers. I'm guessing the excess oil was being diverted back to the res via your valve block, but that's a bit redundant. The newer machines seem to not only have control-by-wire, but the pump only works as much as required, none of that sudden motor noise when you just want to move something by a hair.