Hydraulic pump on a 30 year old excavator: How worn out is it? (Hitachi EX120-2)

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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

[@FishFind3000]

I like how Charley just gingerly walks up and tosses the toy. 🐕🥺Plz throw…

[@ahorodny1]

I wonder how many throws he had to edit out

[@dcviper985]

I kept yelling “throw the toy”

[@larrybolhuis1049]

My Labradors, which are admittedly not trained, won't even run to the thing after it stops! LOL!

[@666sledgehammer666]

love this channel - no drone shots or dramatic music every 5 minutes, just a regular guy getting stuck into a project - brilliant!!

[@ronm3245]

This one had drone shots at the start. I don't think Matt has done that before. It was kind of weird, actually.

[@johnlowther4068]

Subscribe. The quality Matt puts into these videos is awesome and must be time consuming as heck.

[@kb7722]

Youve come this far. Spend the $600. Its the heart of the pump and the machine.

[@turnerg]

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.

[@terryfearn2068]

@@turnergwho made the bearing. If oem and in spec i would keep it

[@Westcoastdigger]

Definitely put new parts in the pump! The excavator will work much better with new plungers

[@jimsworthow531]

@@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.

[@chrisdidamo7675]

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.

[@jeffreyshier9021]

Oh, Charley. 😂😂😂

[@johndebrular979]

I could take that apart but getting it back together a different story, Thus man has guts.

[@chipps1066]

Right!

[@frank-t6857]

My same thought. As scary as a diesel pump rebuild.

[@gags730]

@@frank-t6857 I was thinking the same exact thing...scary as a diesel pump rebuild!

[@mikeadoodles]

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.

[@bobferranti5222]

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.

[@RobertFay]

*- 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.*

[@Ltech-ludditetechnologies]

Charlie behaving well with the little ducklings, so precious. Great work as usual Matt, thank you.

[@davidstarkweather8050]

throw the toy!!!!!! again lol

[@rexwells4552]

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.

[@alanm3438]

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.

[@Bluegroove47]

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.

[@wyrdlg]

Dog and ducklings - could not be better!

[@johnbize5736]

I believe they're goslings. But yeah.

[@andrewwilgress4100]

The goslings will be bossing Charlie soon.

[@frotobaggins7169]

He looked a little nervous with those goslings.

[@charlescarter7496]

Hey!!! toss the dog's binky!!!

[@kenc3288]

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.😄😄

[@flowerstone]

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. 😊

[@petesmith8000]

Charley is just waiting for you Matt - get with the programme - lol

[@PaulBarwick]

Charlie is an optimist.

[@phillipfritz7014]

24:00 STOP teasing the dog!

[@MikeeonYouTube4]

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 🇦🇺👌👌👌👌

[@GOAT_GOATERSON]

Yesssss, everytime you upload I get so excited, I have to watch it immediately

[@hottamaleboy1198]

Me too 😅

[@jamesravnikar5622]

Try looking for bearings at a bearing supply house usually quite a bit cheaper than going to the equipment manufacturer

[@travelingtracer]

My dog does the same thing: drops toy near or on me, waits for if to be picked up and thrown. Repeat. 🐾🤣😂

[@johnoconnor9331]

my shepard will not give nothing back you give him love charley

[@johnviney7919]

Good explanation of the pump, Matt!! Stay with the project!! You're doggie loves being out in the shop and looking after the geese!! 😀

[@roberthocking9138]

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 !!!

[@ashleyjames6010]

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 👍

[@timothypollard1280]

Ya the pistons looked kinda worn.

[@RobertFay]

*- I did not know new swash plates sometimes need lapping when being fitted.*

[@phillipdean9879]

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! 🇦🇺🍺🍺

[@deanehill9730]

Charley has little feathered friends. Thanks for the video.

[@0MoTheG]

12:30 "I didn't do it!" LOL

[@stephenmeeks684]

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.

[@Isthatyoudermot]

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.

[@BriBake68]

Brilliant intro… great work as always! Press onwards young fella. Love the work and attention to detail.

[@timothyball3144]

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.

[@ferguson20diesel49]

Better pump and digger the dash 5

[@marctrossbach6560]

Good to see you out in the daylight! Your place looks awesome. Of course, your content is excellent as always

[@edgarw5919]

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.

[@dalebailey1844]

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.

[@gordonagent7037]

You certainly go 100% in on all your builds, really appreciate that level of detail.

[@RangieNZ]

Charlie is toooo cute, re telling you to play fetch with her! Pretty amazing, seeing the lack of response re the ducks too. :)

[@wileycoyotesr8623]

I find you inquisitive, fearless, smart, logical, and not afraid to seek and tale advice. You can do this. 👍👍👍

[@marcosmota1094]

MATT, you might need a Cutting Edge Eng. size bearing puller. Big sucker, like 8" in diameter, guillotine.

[@jakleo337]

The old swash plate motor/pump. Used on all zero turn lawn mower nowadays.

[@josephsfields]

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.

[@mr6266]

For bearing highly recommended simply bearings out of the UK. They have access to thousands of companies that makes bearing

[@renem6441]

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

[@imienazwisko7052]

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 KZbinrs. Greetings from Poland.

[@Diglo1]

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!

[@kstricl]

I was looking for this before I commented. Seen it on a few others like Diesel Creek (Matt was a former machinist.)

[@Diglo1]

@@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.

[@xtnuser5338]

...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.

[@bmw1894]

@@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.

[@brianblank9921]

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.

[@RobertFay]

*- Agreed. I thought is was just less busy work to do so. Your insight about needing all you pressure you can get is insightful.*

[@paulmanson253]

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.

[@RobertFay]

*- 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.*

[@lifeinbuyck]

Charley's a good boy!

[@timeneilander6338]

I realy love your German Sherpard. Wonderful dogs they are.

[@paulhammond7489]

Appreciate the explanation of how that type of pump works, looks complex but it's really simple when you break down the steps :)

[@trufix72]

Wood toothpicks work great for picking out o-rings too.

[@1971VoiceoftheMummy]

Nice! Almost there.

[@davidwindsor4632]

Chipping away and making a difference. Cheeky ducks🦆 🚁

[@MRrwmac]

Very nice work! Hope you find all the parts you want!

[@lifeafterourloss]

Right on Matt! It is inspiring how you'll tackle about anything! 👍 Best wishes from your friends in Eastern Colorado.

[@rtz549]

Bearings seem still good.

[@jeffh5664]

Great. A New PNH video. Matt, your videos always entertain and enlighten us!

[@morganmurphy6726]

Always enjoy your videos 👍greetings from New Zealand 🇳🇿

[@stephenknutson1343]

Charlie needs his own channel, I help Matt.

[@kamillwojtowiczz3324]

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.

[@kiiiisu]

end is so cute

[@flowerstone]

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. 😊

[@shk2564]

“Rots o ruck!” 😂

[@K3vLo]

The video was great, but the outro was 10/10

[@Tangaroa775]

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

[@SuperMAZ007]

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.

[@ricklarouche4105]

The dog is the class clown.. come on dad, let’s play.. 🥳

[@grandy0406]

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.

[@TyphoonVstrom]

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.

[@rassimbenfifi4015]

Even the new one needs lapping (replace the bearings)

[@johnjohannemann1220]

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.

[@andersnyqvist8671]

Oh i see the end of wideo. a agree the bearing is worn out

[@jscheu71]

You better start paying attention to your supervisor. Might find a surprise in your shoe. lol

[@MitzvosGolem1]

The bronze slipper shoes on pistons plungers and charge pump are the main wear components often first to wear out fail. I built a few of these pumps Pressure compensated variable displacement pumps .

[@dustcommander100]

Another amazing video! Such technical depth!

[@kerrygleeson4409]

Fantastic job Matt great video on this series 🦘

[@tdotw77]

22:00 Slightly modified pitman arm puller to the rescue! Nice one! *Specialty tool* my @$s! Where there's a will -& a welder - there's a way. I know you woulda fabricated something to get that out either way! 👍🏻👌🏻

[@Dysiode]

26:43 that's what she said

[@ineverhadthemoney7857]

buy the ket to replace your piston and case , they must come in a set , if not you have to lappping each piston to pump hole //lol you better start today to lapping then in each bore is so much work it 3 weeks so start now

[@milt7348]

Stay safe and we'll see you next time.

[@brucefowler3371]

You can maybe displace material in the the bore where the bearing fits into. Use a Center punch at equal degrees in the bore. Then use retaining compound

[@jaysmith3361]

Heat expands metal. Can also use a can of liquid air to cool and contract.

[@gags730]

@ 3:39 The dog don't care what the human is doing, its play time.

[@davidbarr1579]

For taking apart that bearing Assy could you freeze it with dry ice or liquid Nitrogen.

[@robertkeime4907]

Great video

[@JBFromOZ]

exciting! great progress mate

[@chipps1066]

We done gotta drone!!WooWeee!

[@richardc3208]

Any old hammer will do, thanks for taking us along

[@joemonks3161]

Loved the gosling.

[@paisu24]

Thanks for the content

[@andrewk6844]

can be upto 3 pumps charge pump , low pressure and high pressure pump. the low pressure pump is to work the remotes . Like electrical system low amps operate the relay so the high amps csn be switched on and off the third is the charge pump , this supplies the oil to the other 2 , the charge pump will be a gear pump, as the other 2 are piston pumps , these cant prime oil. the piece you removed first with the level veries the flow of oil swash plate, yours has the 2 pumps .swash plate piston pump and charge pump /gear pump

[@jdsmort]

Doesn't Charley want a free lunch? ( duckling/gosling snack...)???

[@JohnChuprun]

Charlie is funny. Very cool video, you did a good job imo. Does that other pump maybe have 1 bearing that is the same to compare to?

[@carlaustin7398]

Thanks. I'm looking forward to the next episode.

[@tombeck2792]

Did the previous owner ever do any maintenance?

[@PacificNorthwestHillbilly]

I'm starting to suspect he didn't keep up on maintenance