Excavator Gear Pump Diagnosis And Repair, Yanmar VIO50.
While using my excavator taking down some trees, it started acting up. The blade down function and the swing function both suddenly got very weak. Here I go through the troubleshooting process and repair to get it back in action.
@PracticalEngineeringChannel Grady's take on pumps pretty much matches mine: • Do Pumps Create Pressu...
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#farmlife #farmcraft101 #farming #farmer #righttorepair #excavator #gearpump #hydraulic #yanmar
00:00 Intro
1:15 Check pressure
3:01 Check pressure relief valve
11:05 Awesome trick
12:26 Swap relief valves
16:10 Diagnosis made, start repair.
19:49 Meanwhile
21:03 Pump teardown
28:45 Install new pump
31:50 Check pressures on new pump
33:32 What’s next?
I live in England & have never used heavy machinery so I don’t know why I look forward to your videos so much but I do 👏👏👏🏴🏴🏴
Just thought you might want to know, watching your video now if you were to put a vacuum cleaner with a rag around the top of your oil tank it creates a negative pressure and will not let things drain
Me too, his videos are exceptional content always. He does a fantastic job explaining things, especially how things work. Definitely my favorite KZheadr!
@@brandonallan6807 I don’t know heavy machine but I think the way he thinks through problems is compulsive viewing 😊😊
I agree. Best part of a Friday
I guess you love seals...
Back in my younger happier days I had a shrimp boat with a 471 Detroit and a Twin Disc hydraulic reduction gear. Worked perfect in forward gear but had to be babied in reverse, or pressure would drop to zero. In the off season I pulled the gear and disassembled everything. Looked perfect in every way. I gave up and went to a factory authorized repair shop. I had minimal to no funds and told the mechanic my issue. He agreed to take a look at my pile of parts and also said it looked as good as new. He was holding one of the clutch drums and shaft in his hand and was spinning the drum on the shaft while talking. All of a sudden he said hey that's not right. The clutch drum was supposed to be a press fit on the shaft and it was the one that drove the oil pump. So when any extra strain was put on the reverse gear the shaft would quit turning and no oil pressure. He felt so happy to have figured it out he gave me a used drum and shaft assembly and sent me back to my boat. There are good people out there!
It's still hard to believe that something that pumps oil can wear out.
Yeah. I suspect it had poor maintenance in its past. Pumping dirty oil with old filters probably.
Pumps are hell of thight clearence,dont forget the termal expansion/contraction rate
When you see what cavitation can do to a ships propeller (or cylinder liner), then you can understand the forces that can be created in fluid dynamics when your common sense would make you think there shouldn't be any wear at all when you have metal fighting against water (oil).
I do not see the concept of something that pumps oil can wear out so hard to understand. For the simple reason even the purest and most highly filtered oils with the best possible friction modifiers being produced still produce a certain amount of drag, friction as well as heat additionally an oil filtered to X microns still has Y or Z amount of particulate in it. Lastly even the highest grade corrosion resistant metals oxidized however slightly. In short what I am trying to say the oil, the filtering, the metallurgy, and the tolerance are despite the degree of expense and effort put into them are not perfect and there is where the wear comes from over time.
It's not the oil that wears gear pumps,it's what gets into the oil during the service life of the machine like dirt from quick release connectors and worn ram seals ,air from low oil levels which cavitates the pump and metal from replacement hoses that aren't cleaned out after cutting.
I worked on hydraulics in the USAF for almost 16 years. Your videos make me remember why I went into computer and network repair after the military. Military hydralic fluid was red and would ruin a uniform in minutes if you had a leak run down your arm.....fun times. Great repair and I hope you get the tracking worked out.
That's why the landing gears are white. Any leak can be seen right away.
OM15, or H515 is what we used in the RAF, I feel your pain!!
@@dennishernden2264 People can be toxic (in general). Are people in the tech world more so?
@@dennishernden2264 Gosh, my anecdotal evidence says it's pretty common among gear heads. Call it a draw? And speaking of "tales of woe", aren't you the one that opened that can of worms?
@@dennishernden2264 Sorry, but your gross generalization based on your anecdotal evidence is not compelling.
Regarding pumps. High pressure pumps, like the gear pump you have there or a piston pump, are what’s called positive displacement pumps. They essentially move cavities around, as you demonstrated. This means, that come hell or high water, that pump will move something, as long as it’s lubricated, and given enough input power and sealing forces, it’ll drive any pressure, because it will output a certain volume per revolution, no matter what. The part about restriction is just relative to flow. If you have a large enough pump, a 2 inch pipe is enough restriction to create a certain pressure. However, as pressure in a hydraulic system is similar to voltage, higher pressure is easier to handle than higher flows, so we usually aim for low flow high pressure. Usually there’s some component in a certain design that sets your maximum pressure, for example a certain seal that gets really pricey above a certain pressure because no one uses them except NASA. Then your working pressure for that system is essentially maybe 60% of that.
A positive displacement hydraulic pump will move (displace) a volume of fluid within a closed system "no matter what", but can only do this within the material strength limitations of the hydraulic pump & pump drive. Hence the necessity for a pressure relief valve in the hydraulic system, to prevent hydraulic component damage.
Good to see the Yanmar's content generator is still in good shape! 😂
If you are a KZhead creator, an excavator is the gift that keeps on giving. So is a Subaru WRX....lol!
I use the vacuum trick when replacing valves on fuel oil tanks.
I watched your vid on the stihl weedwacker yesterday. Today i fixed a guys 12 volt positive displacement waterpump for his camper van. The limmit switch got stuck and did not cut out the pump if the pressure got too high and his pressure relief valve kept on opening. Opened the limmit switch and saw the small plastic button melted on the contact due to too high pressure that caused the pump to pull too much amps. I made a cad drawing of the little button, 3d printed a new one out of abs, replaced it. And it works like a charm. Adjusted the pump pressure to below 200kpa, wich is the pressure rating of the pressure relief valvle.
5/19/23; ..(1/2) hydraulic pump trouble shoot, removal, excellent close up camera shots, clear 'show-&-tell' explanations, re-install (no leaks) & psi test/adjust up to 3500 psi...all like factory new! Excellent video Jon! Your mechanical, video & verbal articulation make your channel A+ ! Stay safe & carry on!👍👍👏👏🔧⚙️💪✅️😊
First off I love the fact that you have caps and pulls for all your hydraulic fittings. Second please keep doing these video's I really like your comments as your working on things. Your understanding of how things work is impressive.
Loving the excavator videos. I mean this in the best way but I hope your excavator keeps breaking down so we get to see more repair videos! Major thumbs up for being willing to tackle these repairs.
Appreciate the excellent work and presentation! Always enjoy seeing the cows too!
You are a patient, patient man aside from the dishwasher 😊 Steve
That pump you mention around 29:30 is also known under the name "Gerotor pump". In case someone has difficulties looking up how it works. They're pretty fun, and also used in hydraulic steering systems, like in a tractor or for the articulated steering system in a wheel loader (directly connected to the steering wheel).
Jon, Your videos are among the very best "weekend warrior" jack of all trades type on you tube. Thanks for taking the time to show us wanna bees a few new tricks. And more especially you share your mistakes and we all learn from them.
Seeing all of those internal parts brought back a flood of memories for me. I spent a summer in college working in the shipping department of a hydraulic pump factory and was always fascinated by what we were manufacturing.
You’re definitely a jack of all trades and a master of many….I always enjoy your videos , keep them coming !!
Concise, clear, entertaining, and well produced, as usual. Thanks. 👍💯
Thank you for taking the time to explain how and why the pump failed. This was a really interesting video.
Looks like someone sold that excavator just in time! 😂
😡
They saw the writing on the wall. When they owned it for all that time they could see it’s steady decline.
@@FarmCraft101 sorry man, sorry. But hey, good youtube content 👍🏽 😁
Man, I love being off on Fridays! I get to watch so many of the channels I love right away.
I would recommend a magnetic hook with a string or bungee cord holding the gauge.
Thanks for the teardown and rebuild. Your narrative is informative and straightforward pretty much on point
Good to see that cam gear hanging out at the shop
Best explanation of how a gear pump works
Hey great job both troubleshooting and replacing that gear pump! I'm not a farmer, nor any kind of hydraulics mechanic (know only what you've taught us in vids) but really enjoy watching all your videos. In my opinion you are definitely one of the best KZheadrs out there, hands down! I think a lot of the reason I enjoy your videos so much is because I'm a lot like you in the jack-of-all-trades sense. I strongly believe that everyone should be as self-suficient as possible and that way too many people throw away thousands of dollars paying mechanics for things they could learn to do themselves. I know not everyone is mechanically inclined, but those who are can save a Ton of money not to mention peace of mind knowing exactly what was done and how. Another great video! 🎉
Who else was waiting for the infamous “seal” picture to pop up @ 23:00? 🙋🏼♂️
Thanks for sharing this, I´m not the only one who laughs with that !
He could have put at least 4 seal pictures in the video
He needs to insert a Navy Seal to change it up.
@@guytech7310 or the British singer named "Seal"
I love the vacuum trick. I learned it in high school working at an oil change shop. The number of times that we had someone comeing in cus they had a cross thereaded drainplug. Best part is the tamper seal was always from Wallmart.
Very happy to see you got the pressure back AND that it was a lot more excessable! Looking forward to the tracking.
Every time you take apart the broken thing and explain why it was broken I learn so much. Thanks!
Thank you for all the effort that goes into explaining the details on the projects you get into. You really teaches us a lot . THANKS
Loving the cows intermissions. .
I remember working on a Massey Ferguson that was built during the time when the factory workers knew that the shop was going to move to France. Customer stated that the machine had low pressure on the renotes, and the issue proved to be pieces of swarf from a drill bit that were lodged inside the pressure relief valve
Another successful repair after a spot on diagnosis !! But of course. John. that's all you do !!! A+ again for the best mechanic for anything that moves !!!
I do enjoy tearing down and troubleshooting all hydraulic bits and bobs. It's amazing how such tiny things can be issues in them despite the normal conditions they operate under. More often than not it's as simple as an oring or wear, always in the most inconvenient spot. Hours or days of labour for a 0.00001 cent part 😅
You are now a Yanmar expert!
Criss cross applesauce. Crossing over your lines to see if the problem follows the controls or stays with the hydraulic drive motor I see. Good way to find what is the problem.
that vacuum trick was genius!
Thanks...good vid. I've run a lot of equipment...but your explanations of the mechanics are so straight forward that your videos are a pleasure.
Always fun swapping out bits to see if/where the problem is moving to. Works in so many fields and can save a lot of work if you get lucky. Thanks for the video and cool trick with the vacuum.
I really enjoy how you actually mention prices of parts in your videos. Some will complain but I think a lot of people understand that whether you overpaid or underpaid compared to so-and-so's brother's price it's valuable info and to be taken with context of time period and location. Keep it up please.
I wanna point out in case anyone is interested or was wondering... So Kayaba is the company that makes pretty much all the mini excavator and compact machinery pumps, or at least all the Japanese ones. The name of the company is now KYB. You'll see that logo on the pump in this video. Yes, they're the same KYB that makes high quality shocks and struts for cars, trucks, and recreational vehicles and motorbikes. I think they're the largest manufacturer in the world for hydraulic shocks. They actually make gigantic shocks like 30ft tall for stabilizing tall buildings and underground mines. Hydraulic pumps and cylinders made in America or elsewhere in Europe borrow heavily from the original Japanese design. Back when computer aided lathes and other manufacturing equipment was primitive, the Japanese were able to mass produce parts with high enough tolerances consistently for hydraulics. That's why when people say Japanese automobiles or machinery is better quality than most other brands, they're not talking out of their asses. Nowadays even Chevrolet is manufacturing in the micrometers of tolerances range, so it matters less for newer models. But it makes sense why 1980-2000 model Japanese mini excavators are favored by people because those machines can be had relatively cheaply while still offering a quality design that CAT, CASE, and the John Deeres of the world have only recently been able to match.
Such an excellent job! I'm learning so much about hydraulics from you!
Congrats FC101, on finally getting the Gear Pump replaced and working again. now onto the tracks..
Another informative video John. But one question-where are the pictures of the good seals?
I've got probably a more than average understanding of hydraulic systems. It was nice seeing your breakdown and troubleshooting process. We learn something new everyday. Thanks
Wonderful work and it is so enjoyable to watch you figure out the problem
What's better than a Saturday with farm craft.
Every time I see a new video I have to watch it instead of working on my stuff. I just finished the video. My break is over and I'm going to service my tractor then till the garden. I have 10 gallons of hygard from john deere so I know you feeling on oil prices.
😂😂😂 The Greg Judy throat cleaning @20:35 had me laughing my head off. Please tell me it was intentional. I guess because we are about the same age, all of your humor works on me. Thanks for another great video to start my Saturday morning off here in Tokyo, Japan. Lots of construction and excavators around the city. Because of you and Diesel Creek, I enjoy watching them more than I ever did. Love the content, brother.
Excellent Diagnosis witch helped me on my project of a Cat D5m lgp dozer transmission gear pump problem.
Way to go John ,A mechanic for the ages Job well done no short cuts on trouble shooting and a good call on the pump that scoring and galling ,Dirty oil and filter will do it every time
Your channel is informative and very interesting, good humor to boot. Keep it up and best wishes.
Got to be a great feeling of satisfaction with a succesful repair.
Education I found very useful. Thank you.
Thanks for the update on Big Momma, glad she is doing better. No adjustable wrenches used, the mark of a good mechanic. Bubba uses adjustable wrenches. Not sure why you didn't share the price of the new pump?
If you look at the rear seal at time stamp 24:16 you can see the scarring on the rear seal face. the grooves in that seal face (non rubber side) will allow high pressure oil to bypass the gears and cause blowby. I was a hydraulic pump mechanic and certified by Sauer Danfoss now just Danfoss and rebuilt many of these motors. once you have scoring like that its cheaper to simply replace the pump as they are fairly cheap pumps.
Another great video, but do you know just how many times you seal and not even one picture of a seal? 😄
Ive had to change the odd hydraulic power steering pump on one of our coaches ,good job done !
Love the vac trick :) I can totally see that kind of thing being useful for future hydraulic type work. Hard drive magnets are soooo useful. I have 2 or three big peanut butter jars full of them, and use them for all sorts of useful tasks.
pumps absolutely make both flow and pressure. good description. flow doesn't mean you can create pressure.
pumps absolutely do NOT make pressure, they make flow. Period. They are capable of producing flow up to the design or rated pressure, but the pressure is created by the resistance of the load at the actuator. Once the sealing capability in the pump degrades it will not be able to produce its rated flow for the same actuator resistance, which will show itself as achieving lower pressure in the system due to the increased amount of internal bypass.
Pumps produce head. There is a correlation between Head and pressure ( H=2.31dP/SG). Flow results from a pressure differential, from high to low. Pumps see head, not flow. Flow results from the pressure differential created by the pump. If your pump produces 100psi but is discharging into a container with 100psi ambient pressure, you'll have no flow, but your pump is still developing head/pressure.
@@python3574 So what causes the relief to open if the pump doesn't produce pressure? Its not a flow relief, it's a pressure relief. What happens when you dead head a pump? Your flow is zero but your pressure is at a maximum. If pressure is resistance to flow, how is there pressure when there is no flow? I get what your saying, but the math/engineering doesn't work that way.
A. A pump doesnt produce 100 psi B. You’re overlooking other factors of how the situation you’re describing actually works, such as the actual power source that drives the pump, the type of pump it is, whether it relieves internally, whether it stalls or not, on and on. Bottom line: a pump will pump the water to its rated capacity, or thereabouts, as long as flow is not restricted. Head is the weight if the liquid column, which is a resistive load, along with line resistance, restriction tesistance, etc. a pump cant infinitely create flow to overcome any arbitrary load (pressure) without either bypassing thru a relief, thru its own internal relief, bypass leakage, power limit if whatever is driving it, or stalling.
A relief valve doesnt open unless the resistive load causes the pressure to increase to the setpoint of the relief valve. Once that happens the excess FLOW the pump is producing above what the actual load can use is diverted thru the relief valve to keep pressure from rising. Pressure is not being diverted, flow is. Thats why the downstream side of the relief valve is at tank (atmospheric) pressure.
I used to want a mini excavator. I am beginning to second guess that need.
Just don’t buy a used one from the auction. Not all things at the auction are bad. But all bad things are at the auction.
It amazes me as to how smart you are. Thoroughly enjoyed this video, thank you.
another great video! I'm a diesel mechanic and I've been using the vacuum cleaner trick for years. works good in the cooling system too, I use a small wet vac and made a vacuum chamber from a new gas can to catch any coolant that gets sucked up.
Similar issue I am experiencing is my Bobcat E80's one side track lacks much power than the other side. It turns well off ground and the travel gears seem good. I am going to be exploring my options. Your videos are encouraging to me thank you.
What you are willing to take on amazes me! Keep up the awesome content!
I completely agree with your comments about the pump making pressure. I have run across folks making those same comments about oil pumps in gas engines. Some people grab a hold of stuff on the internet and just love to argue in circles. Haha. Appreciate all of your work putting out these videos. Makes my day when I see a new one released!
It's one of those cases where i think it's reasonable to say it either way but when someone gets pedantic and goes "actually, pumps blah blah blagh," i just roll my eyes. Pressure is a measure of force and that force is created by the pump so I'm with you and john. Pressure is created by the flow from the pump encountering a restriction.
@@Lucas12v agree, there must be a closed system to pump into in order for the system to work. Venting to atmosphere and there is nothing to read since it can’t build. Some will use that to prove it is the pipes or vessel or oil passages making the pressure, but no pump, no pressure.
@@nealinator do you work with hydraulics?
@@miken5029 not in a direct sense. I have have had exposure in my career with a background in engineering.
Another video I just couldn't lay the phone down on. Great job. Thanks for keeping me entertained on a Friday evening
Another great video. The amount of time and effort you put into your videos is amazing. They are very thorough and very informative. I have done many of the projects that you are now tackling and I really wish I had your videos. Well I was trying to do mine lol. Keep up the great work you are becoming one of the KZhead greats.!
Super video, your explanations are crystal clear , so easy to understand, thank you from Ireland🇮🇪☘️
don't know a thing about hydraulics bit you make me understand it. Week after week. Thank you for that! Looking forward to next friday.
Great use of the vacuum at 11:30. I do the same trick swapping the hydraulic filters on my tractor. I always wonder if I should rig a reservoir before the vacuum itself, but never heard of anyone oiling their shopvac so ....
It's always nice to see a video from you. Best wishes from Denmark
I use an old Dyson for a shop vac, along with a "regular" one. Works great.
Thanks for this video. I think this will help me in the future with my Clark forklift.
Just a trick that I have used before. When a socket is too large in diameter as was your case, I use my lathe and turn dow a sacrificial impact socket to fit. I have a collection of altered sockets. I use impact sockets as they are softer steel.
Perhaps consider assembling a drain kit for each oil pan…. Connect a rubber tube long enough to go between drain plug and bucket to a metal male-male threaded adapter (replacing the oil pan plug), and then screw it into the oil pan… keep it there in between oil changes, with the hose removed and the end of the adapter capped off. Really enjoy your videos!
Another top quality video...your videos are not only entertaining but absolutely educational step by by step and methodical based on pure knowledge and extensive research and thorough testing and examination backed with enthusiasm and hunger for knowledge. Job well done .yanmar excavators are known with quality and durability but it look like this one had a hard life and neglect like any other heavy equipment machine out there ...I am sure you will fix this machine and you will bring it to its former glory ..it will serve you for years to come ...looking forward for the next video to fix the tracking problem.keep up the good work .God bless.
Great job on the pump. Beautiful Angus cattle too. My uncle had an Angus stud on his farm here in AUS , beautiful cattle, unless you wanted to ear tag a new born calf and mumma got a bit upset, then it was watch out !!!
Thanks for making these videos.. it is great to see what farmers do.. and how to fix these machines. Very enjoyable while not a mindless waste of time. I like your excavator.. it seems very nice and easy to work on
Great content. Thumbs up!
I am developing patience by watching you work.
John, don't take this the wrong way, because I know it's causing you grief, but I'm so happy your shit keeps breaking ♥
😡😡😡
Great job and a brilliant explanation for the viewers
@25:46 My airplane (Mooney M20C) has a Lycoming engine IO360-A1D and the oil pump works just like this. I had to change out the oil pump because the FAA sent me a notice that suggested I'd fix it out a $45k engine would get damaged
As a mechanical engineer, I couldn’t agree with you more about pump dynamics. You are a very intelligent man!
If it was due to wear wouldn't the pressure drop slowly? but from what I recall you said that the pressure dropped suddenly.
HEF is a good resource I have the bspp plug and cap kit and a full set of rubber lab stoppers! I used a piece of aluminum gutter across the track for draining the main tank, vi0 70
I have learned a bunch on your channel, you show the mistakes, bobos, talk through the process of what you are doing👍👍
great work love watching you its so refreshing
24:40 this is so well explained, and so interesting 👍
Always liked these gear pumps. They last and are almost bullet proof. Then with so much equipment run by people that do not own them you must have a maintenance schedule. Maintenance goes a long way. Clean fluids and filters save money. Good Video! thanks
Thank you for saying that about pump / pressure / flow. I have always hated that statement and believed it to sound misleading.
It's interesting that something that controls huge machinery can be so delicate.
I admire your persistsnce
great video we fix our own problems
Like the teaser, can't wait for the next repair
Hi Jon, very good many thanks, from UK.
Great video very informative. Enjoy watching cause I learn something every time Thank for showing
Another great video! Thanks for the detailed explanation. Scott