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!
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.
The process of proper diagnostics is oddly rewarding when completed and works. This I applaud you for your efforts. This comes from a kid on the farm that ran a D40 Cat in the late 60’s to disc, build terraces and get snow drifts off the county road to the highway. Pull rope to start a Briggs, hit some either, engage starter, check hydraulic oil level and leaks / wet spots. I fix cars, but took side jobs. Diesel cats have 3 tank drains for odd angle operations. This guy was sideways on a frozen hill, removed what looked like a cigar, got it running. I started to warn him, just the blade went up and I yelled! He couldn’t hear and slid 200 yards sideways down 3” of snow on frozen dirt on a 15 degree high temp. He dropped the blade and it stopped 20 feet from a barb-wire fence and road ditch. I was fearing the worst, but he got lucky. I was paid and he opened a bottle of “Jack” from the metal tool box. I bet it was 3 days before he quit shaking! lol. Stay safe. Memories…I almost forgot this one. Last time I worked on anything like that!
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.
@@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?
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.
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.
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 RUclipsrs 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! 🎉
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.
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.
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 😅
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.
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'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
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 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.
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.
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.
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 !!!
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 RUclipsr!
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.
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.
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
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
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
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?
Hi Jon. Probably not the best idea to be holding pressure gauge or gripping it between your knees when testing. The small diameter test hose is not as robust as the main hydraulic lines and can easily be damaged by kinking. If the test hose fails you may have a jet of high pressure oil lancing into your flesh. The gauge & lines should be kept well away from your body when testing.
Those small test hoses are actually far stronger than any hose on the excavator,they are rated to over 10,000 psi working pressure and in my 35 years in Hydraulics I've never seen one fail especially at such low pressure as 3500 psi
😂😂😂 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.
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 RUclips greats.!
Machining debris and grit are the two main reasons hydraulic parts wear. I worked with a numbnuts who used anything for an improvised funnel. His favourite was corrugated cardboard because it "holds its shape, bro."
you should consider buying an oil transfer pump. stop picking up heavy buckets of oil. also handy for filling final drives etc. and a centrifugal oil filter would be a good investment also to reuse your old oils after a day of cleaning.
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.
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 ....
@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
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).
There are wear compensating side plates that move in tight in those gear pumps .. I have lapped scoring off gears and plates and put new seals in them . They usually work fine after that. The pressure compensated variable swash plate pumps are completely different. Very expensive and intense to rebuild properly. I did a few . Best to change hydraulic oil often with best quality oil you can get. Not Tractor supply cheapo oil. Or $$$$$$$$ in damage. I am heavy equipment forums a lot. Excellent channel. Skid steer forum also excellent 👍
I had a similar problem with my pump but was in the middle of a job during the height of the covid bollocks where no one had anything in stock so I cut the shafts back and sleeved them then cut them back to spec on my lathe then made a new set of bushes. I put everything back together and it worked beautifully so much so Ive still not replaced the pump. The whole job took me the best part of a day but if I do it again Id have the machining done in an hour or so. I was lucky it was ony the bushes & shaft faces that had gone it certainly saved me a massive head ache aswell as money that I really didnt have. Sometimes its well worth rebuilding those pumps. . .
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
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!!
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.
As a rule of thumb with checking pumps... a gear pump will tend to peak then drop off when you dead end a funtion if its had it as yours was doing.... piston pumps on the other hand start lower and pump the pressure up a bit if they have had it.... usually if a relief valve is jammed open or has a broken spring which in 40 years i have never seen one...not saying they dont though.. the gauge pressure stays more or less constant. A flow gauge is a very good indicator of pump condition as a duff pump's flow drops off when pressure rises. But you did ok as you normally do. Cheers
One thing about an old pump if its in about that condition, you could use it as a heat recirculation pump [aka no pressure, all flow] for a solar heat collector. The advantages of oil are 1, will not burst any pipes, 2, can handle a lot more heat than water [as in not boiling], 3, it is not corrosive, and 4, its not poisonous. Also, especially when your pump is already that worn out, you don't need to worry about it locking up even in super cold weather. All you need is a small motor to turn it, because it is not there to make any real pressure if you are just moving heat with it.
Hydraulics is a mesh of cascade circuitry. Some very helpful places to go with the internet. Amazing pressure pumps once contaminated there lifespan is reduced. But the advantage of hydraulic power to human power is vast. Great video for servicing. Remember being locked in torpedo tube while testing hydraulic doors. Vice best on undoing tight nuts or bolts. Favourate tool ( nut breaker ).
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.
The process of proper diagnostics is oddly rewarding when completed and works. This I applaud you for your efforts. This comes from a kid on the farm that ran a D40 Cat in the late 60’s to disc, build terraces and get snow drifts off the county road to the highway. Pull rope to start a Briggs, hit some either, engage starter, check hydraulic oil level and leaks / wet spots. I fix cars, but took side jobs. Diesel cats have 3 tank drains for odd angle operations. This guy was sideways on a frozen hill, removed what looked like a cigar, got it running. I started to warn him, just the blade went up and I yelled! He couldn’t hear and slid 200 yards sideways down 3” of snow on frozen dirt on a 15 degree high temp. He dropped the blade and it stopped 20 feet from a barb-wire fence and road ditch. I was fearing the worst, but he got lucky. I was paid and he opened a bottle of “Jack” from the metal tool box. I bet it was 3 days before he quit shaking! lol. Stay safe. Memories…I almost forgot this one. Last time I worked on anything like that!
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.
You have probably saved yourself a million dollars in your lifetime in labor cost...what a work ethic
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.
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.
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 RUclipsrs 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! 🎉
Concise, clear, entertaining, and well produced, as usual. Thanks. 👍💯
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.
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.
Thank you for taking the time to explain how and why the pump failed. This was a really interesting video.
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.
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 😅
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.
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.
Good to see the Yanmar's content generator is still in good shape! 😂
If you are a RUclips creator, an excavator is the gift that keeps on giving. So is a Subaru WRX....lol!
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.
Seeing how much trouble you had with a used excavator, really makes me reconsider if im gonna buy a used one.
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
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!
I would recommend a magnetic hook with a string or bungee cord holding the gauge.
Man, I love being off on Fridays! I get to watch so many of the channels I love right away.
Congrats FC101, on finally getting the Gear Pump replaced and working again. now onto the tracks..
Good to see that cam gear hanging out at the shop
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 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
It's interesting that something that controls huge machinery can be so delicate.
that vacuum trick was genius!
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.
Your channel is informative and very interesting, good humor to boot. Keep it up and best wishes.
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.
Such an excellent job! I'm learning so much about hydraulics from you!
Best explanation of how a gear pump works
Appreciate the excellent work and presentation! Always enjoy seeing the cows too!
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.
Got to be a great feeling of satisfaction with a succesful repair.
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.
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 !!!
24:40 this is so well explained, and so interesting 👍
Thank you for saying that about pump / pressure / flow. I have always hated that statement and believed it to sound misleading.
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 RUclipsr!
@@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...
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.
Excellent Diagnosis witch helped me on my project of a Cat D5m lgp dozer transmission gear pump problem.
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.
Who would have thought “Cradles” by Sub Urban would be the outro music. Great song for the ending of another great video.
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.
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
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
I use an old Dyson for a shop vac, along with a "regular" one. Works great.
You have the best show in town graduation why was someone with a great show who is a great teacher I love your show
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
You are now a Yanmar expert!
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
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?
Super video, your explanations are crystal clear , so easy to understand, thank you from Ireland🇮🇪☘️
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"
It amazes me as to how smart you are. Thoroughly enjoyed this video, thank you.
It's always nice to see a video from you. Best wishes from Denmark
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 👍🏽 😁
I have learned a bunch on your channel, you show the mistakes, bobos, talk through the process of what you are doing👍👍
You are a great teacher and i Love the content......... keep it going..... I´l be watching..... Love. Sweden.
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.
Hi Jon. Probably not the best idea to be holding pressure gauge or gripping it between your knees when testing. The small diameter test hose is not as robust as the main hydraulic lines and can easily be damaged by kinking. If the test hose fails you may have a jet of high pressure oil lancing into your flesh. The gauge & lines should be kept well away from your body when testing.
This made me squirm watching it. Very vulnerable place for a male. Hydroponic oil injection is something you shouldn't do a Google image search for.
Those small test hoses are actually far stronger than any hose on the excavator,they are rated to over 10,000 psi working pressure and in my 35 years in Hydraulics I've never seen one fail especially at such low pressure as 3500 psi
😂😂😂 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.
Nice repair And Testing Jon @FarmCraft101
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 RUclips greats.!
Machining debris and grit are the two main reasons hydraulic parts wear. I worked with a numbnuts who used anything for an improvised funnel. His favourite was corrugated cardboard because it "holds its shape, bro."
you should consider buying an oil transfer pump. stop picking up heavy buckets of oil. also handy for filling final drives etc. and a centrifugal oil filter would be a good investment also to reuse your old oils after a day of cleaning.
Thanks for this video. I think this will help me in the future with my Clark forklift.
I am developing patience by watching you work.
Stay safe and we'll see you next week.
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.
Ive had to change the odd hydraulic power steering pump on one of our coaches ,good job done !
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 ....
@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
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).
There are wear compensating side plates that move in tight in those gear pumps ..
I have lapped scoring off gears and plates and put new seals in them .
They usually work fine after that.
The pressure compensated variable swash plate pumps are completely different.
Very expensive and intense to rebuild properly.
I did a few .
Best to change hydraulic oil often with best quality oil you can get.
Not Tractor supply cheapo oil.
Or $$$$$$$$ in damage.
I am heavy equipment forums a lot.
Excellent channel.
Skid steer forum also excellent 👍
I had a similar problem with my pump but was in the middle of a job during the height of the covid bollocks where no one had anything in stock so I cut the shafts back and sleeved them then cut them back to spec on my lathe then made a new set of bushes. I put everything back together and it worked beautifully so much so Ive still not replaced the pump. The whole job took me the best part of a day but if I do it again Id have the machining done in an hour or so. I was lucky it was ony the bushes & shaft faces that had gone it certainly saved me a massive head ache aswell as money that I really didnt have. Sometimes its well worth rebuilding those pumps. . .
Did you use mild steel? I would think the bushes should be hardened.
Well, seen as everyone is saying where they are from.
Hello, from new Zealand 👍🏻👍🏻
Like the teaser, can't wait for the next repair
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
You are a patient, patient man aside from the dishwasher 😊 Steve
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!!
I suspect this is over in Europe somewhere . . . Bells on the cows . . .
ruclips.net/video/IypL_EcI9XE/видео.html
Great job and a brilliant explanation for the viewers
Thanks for the teardown and rebuild. Your narrative is informative and straightforward pretty much on point
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.
Another video I just couldn't lay the phone down on. Great job. Thanks for keeping me entertained on a Friday evening
Happy to hear that Big Momma is doing better
Another great video, but do you know just how many times you seal and not even one picture of a seal? 😄
Wonderful work and it is so enjoyable to watch you figure out the problem
i learn a lot from these videos. like never buy the cheapest pos excavator for sale.
As a rule of thumb with checking pumps... a gear pump will tend to peak then drop off when you dead end a funtion if its had it as yours was doing.... piston pumps on the other hand start lower and pump the pressure up a bit if they have had it.... usually if a relief valve is jammed open or has a broken spring which in 40 years i have never seen one...not saying they dont though.. the gauge pressure stays more or less constant.
A flow gauge is a very good indicator of pump condition as a duff pump's flow drops off when pressure rises.
But you did ok as you normally do. Cheers
One thing about an old pump if its in about that condition, you could use it as a heat recirculation pump [aka no pressure, all flow] for a solar heat collector.
The advantages of oil are 1, will not burst any pipes, 2, can handle a lot more heat than water [as in not boiling], 3, it is not corrosive, and 4, its not poisonous.
Also, especially when your pump is already that worn out, you don't need to worry about it locking up even in super cold weather.
All you need is a small motor to turn it, because it is not there to make any real pressure if you are just moving heat with it.
Love watching your content!
Hydraulics is a mesh of cascade circuitry. Some very helpful places to go with the internet. Amazing pressure pumps once contaminated there lifespan is reduced. But the advantage of hydraulic power to human power is vast. Great video for servicing. Remember being locked in torpedo tube while testing hydraulic doors. Vice best on undoing tight nuts or bolts. Favourate tool ( nut breaker ).