Hydraulic pump on a 30 year old excavator: How worn out is it? (Hitachi EX120-2)
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- เผยแพร่เมื่อ 29 พ.ค. 2024
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Price sheet for this project:
docs.google.com/spreadsheets/...
Here are the previous videos from this project: • I bought a broken exca...
0:00 intro
1:32 washing pump
7:42 main disassembly
24:40 pilot pump and input shaft
36:55 ending
#excavator #hitachi #isuzu - ยานยนต์และพาหนะ
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I like how Charley just gingerly walks up and tosses the toy. 🐕🥺Plz throw…
I wonder how many throws he had to edit out
I kept yelling “throw the toy”
My Labradors, which are admittedly not trained, won't even run to the thing after it stops! LOL!
love this channel - no drone shots or dramatic music every 5 minutes, just a regular guy getting stuck into a project - brilliant!!
This one had drone shots at the start. I don't think Matt has done that before. It was kind of weird, actually.
Subscribe. The quality Matt puts into these videos is awesome and must be time consuming as heck.
Youve come this far. Spend the $600. Its the heart of the pump and the machine.
Agreed, anything that would require the entire machine to be torn down to replace should be dealt with now. The way i see it, if you have any reservations about a part then it should be replaced, especially for something that deals with extreme forces.
@@turnergwho made the bearing. If oem and in spec i would keep it
Definitely put new parts in the pump! The excavator will work much better with new plungers
@@terryfearn2068 agreed; the bearings looked actually good with even wear; i did not see galling or pits. But, now that he did all that work and tore it apart, just replace them.
That dog would probably play forever, I like how she kept bringing the ball to Matt as he was backing up. Thanks for the explanation on the pump.
Oh, Charley. 😂😂😂
I’ve never seen anyone use an engine stand to hold so many different things. I love the ingenuity
I use to build those hydraulic gear pumps. Worked for Eaton for decades. Machined every part in them as well. The aluminum body, I used to final hone both ends. They had to be machined in a "cold room" so they wouldn't warp after machining. The main deal when rebuilding them is making sure your internal seals are in correctly. I've rebuilt thousands of them where people put the seals in upside down or not seated correctly. So be careful. Those little shafts with the round ball on the end, make sure there are no scratches. I've polished thousands of those. even the tiniest scratch will take the pump out. Those pumps have a VERY tight tolerance. The gears within .003 of an inch. Also ran the CNC that machined the gears. We had to know how to machine every part and build them. Good Luck, looks like you're doing good.
*- Do you think he should buy the new parts he talked about or do the lapping idea.*
*- I kept thinking buying them is the right way to go.*
I imagine these pumps are assembled in a vertical orientation - the complete assembly of pistons in bores on the loaded bearing input shaft, lowered into the main case.
I could take that apart but getting it back together a different story, Thus man has guts.
Right!
My same thought. As scary as a diesel pump rebuild.
@@frank-t6857 I was thinking the same exact thing...scary as a diesel pump rebuild!
On this weeks episode of Pacific Hillbilly, watch him transform into MacGyver. I really enjoy watching you use your skills to solve problems. I ran a heavy duty shop for 35 years and you are highly skilled and you don't give yourself enough credit for your workmanship.
Matt, since you disassembled it all the way apart, you should always replace all bearings and seals, check into a local bearing shop, they can get them much easier and cheaper and they will be a name brand bearing. By the way, spend the money for a new pump assembly, you'll be much happier later and you'll have full pressure when you need it later.
*- Agreed. Spend the money for new parts. My thoughts exactly> Yes, the lapping thing is interesting, but why do all that bother when you have less bother ordering new parts.*
All those extra pillows the wife puts on the bed would have been perfect to catch the gears!
Charlie behaving well with the little ducklings, so precious.
Great work as usual Matt, thank you.
throw the toy!!!!!! again lol
I watch a lot of utube videos but your channel is the only one that I will stop what I’m doing to watch.I love everything about this channel.
Great video. It is good to see you and the project. Hang in there. One day you will have it done. You have gone where most men would not dare. You are giving yourself quite the education.
My male German shepherd Harvey used to drop his toys at my feet all the time. He’d sit there and stare at me. If only I could do with with him again. I had to rewind this part of the video and show my wife, how much it reminded me of him. My female shepherd is lazy, she walks out in front of me and flops on the ground, belly up and begging for belly rubs. Thanks for sharing the excellent content.
Dog and ducklings - could not be better!
I believe they're goslings. But yeah.
The goslings will be bossing Charlie soon.
He looked a little nervous with those goslings.
Hey!!! toss the dog's binky!!!
That coupling is a Centaflex series A type S, which uses the flexible element under compression principle. Excellent coupling for torsional vibration dampening, but doesn’t like oil.😄😄
I believe those are pistons, not plungers. Unless you replacing them with new ones it is important that they all go back in the same hole they came out of.
I’ve really been enjoying this series on the excavator. As I did with the D4. 😊
Charley is just waiting for you Matt - get with the programme - lol
I love the dog coming up to you wanting to play!!
Another great video - you are fearless the way you tackle stuff you've never done before. Love it when your sheppard is in the video - grew up with them.
Charlie is an optimist.
And for his next project, Matt buys a Blackhawk helicopter to restore: “ I like a challenge” he says. 😊
(Thanks Matt, I appreciate the segment on how the pump works)
Matt,when you said did i mention that I haven’t done this before it doesn’t matter,we of the faith know that miracles do happen as they have before, everything will come out in the wash,all the best from Perth 🇦🇺👌👌👌👌
Yesssss, everytime you upload I get so excited, I have to watch it immediately
Me too 😅
Matt, is there nothing you are afraid to tackle. You are amazing. Well done.👏🏼👏🏼👏🏼👏🏼👏🏼👏🏼
Try looking for bearings at a bearing supply house usually quite a bit cheaper than going to the equipment manufacturer
My dog does the same thing: drops toy near or on me, waits for if to be picked up and thrown. Repeat. 🐾🤣😂
my shepard will not give nothing back you give him love charley
Good explanation of the pump, Matt!! Stay with the project!! You're doggie loves being out in the shop and looking after the geese!! 😀
Nice job, Charley wasnt giving up on that ball today 😂, beautiful dog. Well done for tackling that pump, your a braver man then me, but it’s very interesting watching someone else have a crack 😁. My advice, spend the $600, you don’t want to have to get in there again !!!
Another great video Matt. There's an elephant in the room though - what's in the big crate in the driveway?
Nice job on the disassembly of the pump, it is at times very difficult to get bearing assemblies pressed apart, and at times one has to do a Hail Mary and get to it anyway you can. It will be interesting to see and hear how you will resolve some of issues you have come across in the tear down. As for Charlie, well, persistence would describe the attitude best, enjoyed watching, appreciate your videos and your approach to repairs. Thanks.
I think Charlie stole the show. 😂
Definitely replace the pistons and cylinder block ans also the valve plate if you can get it separately but the swash plate maybe send out to get it lapped if it needs it if you get a new one it maybe will need lapping to the head anyway? Bearings and seals as a matter of course while it's apart. Really enjoy the channel it's great to watch 👍
Ya the pistons looked kinda worn.
*- I did not know new swash plates sometimes need lapping when being fitted.*
Charley is a star! She’s like my Millie, will play all day… oh yeah…. The video was interesting too Matt! If you can afford new parts…buy them. That pump would be a right B pull back out later! 🇦🇺🍺🍺
Charley has little feathered friends. Thanks for the video.
Nice job Matt ; Charlie(y) and the ducks footage is always welcome also! That's an amazing "back yard" you have !!
12:30 "I didn't do it!" LOL
I think you did a great job disassembling the hydraulic pump. I have enjoyed watching you for all your content. Your dog feels left out, but I’m sure he’s just a brat.
Charlie; "Are you busy?" Throws toy "How about now, now, now?"
Matt, I've commented on other videos. I've been with you since you bulled the bulldozer out of the ditch.
The quality of your videos is great. I love how you bring us along by talking to us. It's really great.
I love working on my cars and motorcycle. Just keep plugging along. Also, i still seem to remember you saying that this would NOT be a full tear down project like the bulldozer 😂😂.
Thank you.
Brilliant intro… great work as always! Press onwards young fella. Love the work and attention to detail.
If you really want to get your mind blown, read up on how the -5 pump works. There are feedback linkages and pistons inside pistons and PWM solenoids. The pumping action is the same, but the control of the swash plate is insane.
Better pump and digger the dash 5
Good to see you out in the daylight! Your place looks awesome. Of course, your content is excellent as always
Thank you for showing your Axial Variable piston pump. Axial piston pump are the best pumps in use for the application. The only difference is how the pump is been stroked. All the Pumps I repaired are different in design and stroke control function. A lot of heavy, dirty oily work. It was interesting to see how this pump was been built. I am glad to be out of it in my old age profession. It is good to see you have a go at the repair. LOL. From down under.
Charlie is toooo cute, re telling you to play fetch with her! Pretty amazing, seeing the lack of response re the ducks too. :)
You certainly go 100% in on all your builds, really appreciate that level of detail.
How nice of you to cut the grass so the little ones can eat and be able to see the dangerous animals. they seem to like your dog. thanks for showing this.
I'm only from Brazil and I really like your videos, post more videos so we know how the machine repair is going...
I find you inquisitive, fearless, smart, logical, and not afraid to seek and tale advice. You can do this. 👍👍👍
MATT, you might need a Cutting Edge Eng. size bearing puller. Big sucker, like 8" in diameter, guillotine.
The old swash plate motor/pump. Used on all zero turn lawn mower nowadays.
You got it backward with how the pump works.
Low angle = Low flow.
High angle = High flow.
High flow takes more HP so as the load pressure goes up the angle will reduce automatically to keep the engine in its optimum load.
With Hitachi any time you get excessive engine load or stalling you need to check the angle sensor as that is the most likely cause.
So the solenoids essentially override the operator input to prevent exceeding some maximum pressure? What mechanical mechanism sits between the operator input and the swash-plate? Or is the whole thing controlled electronically?
@@xtnuser5338 There is no mechanical link .
In the video you saw him remove the pilot pump. That pump delivers low pressure (about 400 psi) to the control levers and from there to the main control bank. The computer reads, among heaps of other things, the angle of the swash plate from the angle sensor the rpm of the pump from the speed sensor and use's the servos to adjust the angle of the swash plate to maintain a prescribed RPM range. Technically this is not a variable swash plate pump. The swash plate is the plate that the pistons are attached too. In a variable swash plate pump it is the plate that changes angle to adjust the flow rate. In this pump it is the pump body that is changing. The nett effect is identical though
@@Agnemons Thanks. I understand everything except: It's not intended to be variable? If the operator pulls only partway, because he wants to swing the boom slowly or whatever, is the lower fluid flow created by reducing engine rpm? Or is the swashplate/head only tilted part way?
@@xtnuser5338 No, the appropriate valve on the control bank is proportionally opened according the control lever input.
But the control is done with hyd using the pilot system. The control computer regulates the swash angle to ensure the engine is running at its optimal load and the operator inputs are transmitted from the control lever to the hyd control bank (One control valve for each function. Boom, Dipper arm, bucket, slew and travel. All bi directional) using the pilot system.
They are two separate systems
I thought that is what I said, but maybe I said it wrong. If you see the very first video on this machine, it would immediately stall when you used any hydraulics. I replaced the angle sensor first but it ended up being the wiring to the servos keeping it at full angle
Enjoyed this video immensely. Learning from the trials and tribulations of disassembly by someone else doing it is very helpful. Thanks for the contribution and congratulations on your success. Am looking forward to part II.
For bearing highly recommended simply bearings out of the UK. They have access to thousands of companies that makes bearing
It looks like this may be the easiest assembly Matt has has tackled so far on the excavator.
I've no he's going to end up with it done just as professional as any shop could have done it.
Love German shepherd have had several through the year!! And the behave just like charley always ready to play!! The pump doesn’t look to that damaged at lest in the video!! Thanks for sharing
Charley is earning his keep by guarding the little ducks. Your up to your ears in worries as to which way to go. Just glad its not me making a decision on how much money to spend.
Charlie: Dad, it's not work time, it's play time.
Best route is to replace all wirn parts.
Resurface parts that aren't hardened.
Those are most likely definitely hardened to handle the pressures they are under when operating.
No matter, Matt is going to do what he thinks is best.
That said, it's better to replace them that to have to rip it out again when he ends up seeing to many shavings in the oil after it's had a hundred or so hours on it.
Nice drone intro. People like dogs and you know it. Johy farmcraft also discovered this and bought himself a dog xD. You discovered the magic of drone shots and bought one too. Matt dieselcreek, John farmcraft and you, my three favorite American TH-camrs. Greetings from Poland.
About the spinning bearing. Use a punch on the bearing housing and make little dimples (a lot of them) all around evenly and after that use very hard retaining compound to seal the deal.
You could also sand the outer race of the bearing to further help loctite keep it in place.
It is still way better then freely spinning bearing. But you can only do it if there is little to no play.
If you feel there is a clearance between the bearing and the housing (you can feel the bearing moving other then just along the bore) then the only thing you can do is to machine a sleeve and restore the original bore, or machine a bigger bearing in there.
I hope this helps!
I was looking for this before I commented. Seen it on a few others like Diesel Creek (Matt was a former machinist.)
@@kstricl I had to comment, because I have done it succesfully many time, but in order to succeed it can't be too loose, yet is an option. However it totally depends on how easily it is serviceable later on after assembly.
Naturally if it is a very difficult place then do it right the first time.
...or you could add material to the bore via welding, and then machine the original bore back to spec. Work-holding on that case is going to be a giant pain in the butt regardless, unless you've got a pretty big mill.
@@xtnuser5338 A Horizontal Boring Mill is the preferred option for this kind of job. I would bore out the hole and sleeve it. If you're curious Brian Block @bcbloc02 has several videos doing bore repairs on a HBM.
Great video as usual Matt! Thanks for sharing. I'll chime in, you should just replace the internals. You never know if you'll need every bit of the hydraulic pressure to accomplish something in the future.
*- Agreed. I thought is was just less busy work to do so. Your insight about needing all you pressure you can get is insightful.*
Definitely replace the rotating group 👍 The pistons have almost 0 clearances when new and the brass on the swashplate is critical also.
Good dog!
Personally I would suggest investing in a gallon of Gunk or Dunk. A good parts scrub brush . Really hot water,but if your sprayer is not designed for it,you run watcha brung. You already have the compressed air liquid spray dispenser. But the Gunk really helps.
Coffee and motivation. Keep at it. You done good so far.
*- Matt, you already got me laughing at **1:13**. Thank you so very much!*
*- You can't know how emotionally fatigued I was this day and the laughter at your self-deprecating wry comment about getting rescued after flying parts mystified you really helped my perspective...*
*- {and no, I won't burden you why or your followers here with the troubles coming my way}.*
*- You did it again with your wisecrack **2:44** about "Now that I've already got metal flakes in the pump, there is no going back."*
*~ ~ ~ ~ ~*
*- Super good tutorial at the end about how the pump works. Thank you.*
Charley's a good boy!
I realy love your German Sherpard. Wonderful dogs they are.
Appreciate the explanation of how that type of pump works, looks complex but it's really simple when you break down the steps :)
Wood toothpicks work great for picking out o-rings too.
Nice! Almost there.
Very nice work! Hope you find all the parts you want!
Chipping away and making a difference.
Cheeky ducks🦆 🚁
Right on Matt! It is inspiring how you'll tackle about anything! 👍 Best wishes from your friends in Eastern Colorado.
Bearings seem still good.
Great. A New PNH video. Matt, your videos always entertain and enlighten us!
Always enjoy your videos 👍greetings from New Zealand 🇳🇿
Thanks for sharing Matt, maybe get some advice from a hydraulic shop so you know what should be changed out! Louisiana sending prayers and positive energy to you and your family and Charlie too! She really wanted daddy to play ball with her! lol But I’m sure you’re used to that Matt, she’s a good girl! Thanks brother! 🙏🏻🙏🏻🙏🏻👏🏻👏🏻👏🏻👏🏻👏🏻👌🏻👌🏻👍🏻👍🏻👍🏻🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🙋🏼🙋🏼✌🏻✌🏻✌🏻
Charlie needs his own channel, I help Matt.
Repairing such a pump requires experience and knowledge. Parts that look good to a layman often have to be thrown away. Accurate measurements supported by knowledge are essential for verification.
end is so cute
Gear pumps are a lot easier to work on. Mating surfaces have to be perfect though. Worrying about scratches is a good thing. Don’t want those. 😊
The video was great, but the outro was 10/10
“Rots o ruck!” 😂
🇺🇲🇵🇷🇲🇽😎 I love all your videos, Charlie. She's beautiful.❤ Lots of information. Now we know why shops get so much for repairs😊
I seen a trick where the bolt had snapped like yours he welded a washer to the snapped bolt then a nut to the washer obviously the heat helped the bolt to come out easily a trick for when it is needed
Very good video Matt. I see Charley seems to be a very playful mood. I think the overlapping of the parts is something you need to study before you attempt it yourself.
Damn, I thought I was a servant to my cat, but that dog of yours is quite determent to get you to play with him.
Charlie just wants to play. So fun.
The dog is the class clown.. come on dad, let’s play.. 🥳
Great job and really interesting. I greatly admire your ingenuity and dedication to doing any rebuild the right way . Good luck and can’t wait to see the excavator operating.
The main pump is a variable displacement pump. Pressure is constant, but displacement (volume) is changed according to load. So, when you use several controls at once, pump goes to full displacement. They make variable displacement pumps so the engine and pump aren't under constant full pumping load and bypassing to control flow.
This is obviously good for engine and pump life, but also for the hydraulic fluid- much less heat build up by making fluid do unnecessary work. You SHOULD be able to buy replacement bronze inserts for the head of the body and displacement cam.
Even the new one needs lapping (replace the bearings)
Repairing the housing where the Outer race was spinning is no problem. You need a very sharp pointed punch. You want to go and punch the housing where they’re bearing rides. That will raise the material around the punch, MARK. I would do four around the circumference of the whole. I would do 12 o’clock 3 o’clock 6 o’clock and then 9 o’clock towards the outer part of where the race. In between those four punches, you do the same where the inner race would ride or I should say the outer part of of the housing in between where the outer punches are so you wind up with eight punch marks total that are evenly spaced for our meet up edge of the race and four on the inner or lower edge of the race. When you install, I would definitely red lock on the outer brace where it contacts the housing and you install it, it will be snug against the punch marks. I don’t know if I’m explaining it very well but I’ve done this hundreds of times is a master technician with Ford motor company. Good luck. Enjoy watching the videos.
Oh i see the end of wideo. a agree the bearing is worn out
I find it really amazing that you do so many stupid things and still get good results.
Maybe there is hope for me.