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!

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 👏👏👏🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿

@edwardswiderski4137

Жыл бұрын

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

@brandonallan6807

Жыл бұрын

Me too, his videos are exceptional content always. He does a fantastic job explaining things, especially how things work. Definitely my favorite KZreadr!

@peterwalton1502

Жыл бұрын

@@brandonallan6807 I don’t know heavy machine but I think the way he thinks through problems is compulsive viewing 😊😊

@markedis5902

Жыл бұрын

I agree. Best part of a Friday

@Echohb

Жыл бұрын

I guess you love seals...

It's still hard to believe that something that pumps oil can wear out.

@FarmCraft101

Жыл бұрын

Yeah. I suspect it had poor maintenance in its past. Pumping dirty oil with old filters probably.

@Adam-bw4lw

Жыл бұрын

Pumps are hell of thight clearence,dont forget the termal expansion/contraction rate

@merlepatterson

Жыл бұрын

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).

@gullreefclub

Жыл бұрын

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.

@pauldavidson6321

Жыл бұрын

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.

@freddyrosenberg9288

Жыл бұрын

That's why the landing gears are white. Any leak can be seen right away.

@andrewmullen4003

Жыл бұрын

OM15, or H515 is what we used in the RAF, I feel your pain!!

@wfemp_4730

Жыл бұрын

@@dennishernden2264 People can be toxic (in general). Are people in the tech world more so?

@wfemp_4730

Жыл бұрын

@@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?

@wfemp_4730

Жыл бұрын

@@dennishernden2264 Sorry, but your gross generalization based on your anecdotal evidence is not compelling.

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.

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.

@shadovanish7435

Жыл бұрын

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.

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.

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!👍👍👏👏🔧⚙️💪✅️😊

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.

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 KZreadrs 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! 🎉

You’re definitely a jack of all trades and a master of many….I always enjoy your videos , keep them coming !!

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.

Concise, clear, entertaining, and well produced, as usual. Thanks. 👍💯

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 are a patient, patient man aside from the dishwasher 😊 Steve

Good to see the Yanmar's content generator is still in good shape! 😂

@python3574

Жыл бұрын

If you are a KZread creator, an excavator is the gift that keeps on giving. So is a Subaru WRX....lol!

Thank you for taking the time to explain how and why the pump failed. This was a really interesting video.

Man, I love being off on Fridays! I get to watch so many of the channels I love right away.

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).

You have probably saved yourself a million dollars in your lifetime in labor cost...what a work ethic

Appreciate the excellent work and presentation! Always enjoy seeing the cows too!

Good to see that cam gear hanging out at the shop

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.

that vacuum trick was genius!

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.

Thanks for the teardown and rebuild. Your narrative is informative and straightforward pretty much on point

You are now a Yanmar expert!

I would recommend a magnetic hook with a string or bungee cord holding the gauge.

Congrats FC101, on finally getting the Gear Pump replaced and working again. now onto the tracks..

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.

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.

Best explanation of how a gear pump works

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.

Got to be a great feeling of satisfaction with a succesful repair.

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 😅

😂😂😂 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.

Very happy to see you got the pressure back AND that it was a lot more excessable! Looking forward to the tracking.

Looks like someone sold that excavator just in time! 😂

@FarmCraft101

Жыл бұрын

😡

@FishFind3000

Жыл бұрын

They saw the writing on the wall. When they owned it for all that time they could see it’s steady decline.

@MrSleepProductionsInc

Жыл бұрын

@@FarmCraft101 sorry man, sorry. But hey, good youtube content 👍🏽 😁

It's always nice to see a video from you. Best wishes from Denmark

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 !!!

Such an excellent job! I'm learning so much about hydraulics from you!

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

Ah yes! I love your digger repair videos the best!!

Your channel is informative and very interesting, good humor to boot. Keep it up and best wishes.

Every time you take apart the broken thing and explain why it was broken I learn so much. Thanks!

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 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

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.

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 KZread greats.!

It's interesting that something that controls huge machinery can be so delicate.

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.

It amazes me as to how smart you are. Thoroughly enjoyed this video, thank you.

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

Wonderful work and it is so enjoyable to watch you figure out the problem

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?

I don’t wish hydraulic repairs of an excavator upon anyone such as yourself, but it’s nice to know I’m not the only one who own an excavator not for business use that has had to troubleshoot and make repairs on the worse end of the spectrum. This comment could also be used to let you know you aren’t alone either hahaha. I tore apart and “fixed” my final drives 3 time, hours of trouble shooting before I determined it needed new drives. Installed new drives last week, it’s works great now, but I don’t even want to use the excavator due to the frustration and ptsd of it being fixed for an hour only to have the issue to reappear again. I’m taking a break

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 !!!

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.

Who would have thought “Cradles” by Sub Urban would be the outro music. Great song for the ending of another great video.

Super video, your explanations are crystal clear , so easy to understand, thank you from Ireland🇮🇪☘️

I use an old Dyson for a shop vac, along with a "regular" one. Works great.

Love these Videos! I look forward to them every Friday! I also like the brief segues to the cows. I’ve watched some interesting video shorts about a someone playing a music instrument for the cows and they all come running over to listen. I think that would be some interesting and fun content if you tried that with your cows. Keep up the good work!!

@aviatordave1

Жыл бұрын

I suspect this is over in Europe somewhere . . . Bells on the cows . . . kzread.info/dash/bejne/e62krsF-k6yfiKg.html

I am developing patience by watching you work.

Another informative video John. But one question-where are the pictures of the good seals?

As a mechanical engineer, I couldn’t agree with you more about pump dynamics. You are a very intelligent man!

Excellent Diagnosis witch helped me on my project of a Cat D5m lgp dozer transmission gear pump problem.

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!

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

Like the teaser, can't wait for the next repair

I really can’t understand nothing in these videos even if they are really well explained but they are very entertaining and relaxing to watch.

Another video I just couldn't lay the phone down on. Great job. Thanks for keeping me entertained on a Friday evening

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.

I used to want a mini excavator. I am beginning to second guess that need.

@FishFind3000

Жыл бұрын

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.

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!

@Lucas12v

Жыл бұрын

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.

@nealinator

Жыл бұрын

@@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.

@miken5029

Жыл бұрын

​@@nealinator do you work with hydraulics?

@nealinator

Жыл бұрын

@@miken5029 not in a direct sense. I have have had exposure in my career with a background in engineering.

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.

Thanks for this video. I think this will help me in the future with my Clark forklift.

Great job and a brilliant explanation for the viewers

What you are willing to take on amazes me! Keep up the awesome content!

Another great video, but do you know just how many times you seal and not even one picture of a seal? 😄

You have the best show in town graduation why was someone with a great show who is a great teacher I love your show

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

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

Great video very informative. Enjoy watching cause I learn something every time Thank for showing

Ive had to change the odd hydraulic power steering pump on one of our coaches ,good job done !

Stay safe and we'll see you next week.

Seeing how much trouble you had with a used excavator, really makes me reconsider if im gonna buy a used one.

Who else was waiting for the infamous “seal” picture to pop up @ 23:00? 🙋🏼‍♂️

@TheLablujan

Жыл бұрын

Thanks for sharing this, I´m not the only one who laughs with that !

@erik_dk842

Жыл бұрын

He could have put at least 4 seal pictures in the video

@guytech7310

Жыл бұрын

He needs to insert a Navy Seal to change it up.

@azjv

Жыл бұрын

​@@guytech7310 or the British singer named "Seal"

I have learned a bunch on your channel, you show the mistakes, bobos, talk through the process of what you are doing👍👍

Love the videos, helps me to work on my tractor’s hydraulics. Like all of your videos super informative.

Love watching your content!

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

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 job on the troubleshooting. Asking for ideas is one of the smartest things to do. None of us know everything about anything. 😁😎 Have you considered getting a filter cart? With that you can pump out the tank, filter oil being put into the tank without having to lift the buckets over the fill, and recirc the oil in the tank through the filters on the cart. Great for when you have a puked valve or pump that leaves metal shavings in the tank, or you get a unit with a dirty tank that you don't want to remove and flush. Along with all of those plusses you can just filter and top off the tank periodically without having to dump or haul used oil. Nice not having to have enough oil to change the oil on a service cycle. Just clean and keep going.

great work love watching you its so refreshing

Happy to hear that Big Momma is doing better

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.

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 ♥

@FarmCraft101

Жыл бұрын

😡😡😡

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 ....