Excavator hydraulic pump making noise

[barbender]

That's brutal for one bearing, big bearings are usually big $$$. Great pictures!

[Satamax]

Some chairlift bearings cost around 40000€. I'm sure in boats or other extremely heavy industry, some cost even more. 

[barbender]

My machine is at Ponsse for its spring service. The mechanics just sent me this picture, they said this stuff was in my hydraulic return filter👎

[barbender]

Not the finger, that was just for scale😂

[teakwood]

ughh, that's not good barbender


they will buy the bearing in china for 2000$, box and wrap all sayes SKF which is a quality brand, but for 2000$ i'm not so sure. they will only change one side and not even open the other side for inspection  :. there are two pairs of big bearings which move the jaw, i'm pretty sure both should be changed, at least the pair who is damaged

[mike_belben]

ramon when you tear down your pumps have a sheet of glass and a few new sheets of sandpaper available and some old gasoline for wash solvent.  brush on some oil or ATF or even WD40 to the glass to get the sandpaper to stick to the glass, then oil the paper grit side.

when you find these, resurface them to fine polished perfection and put it back together.  you are getting crossleakage on the output side of your pumping elements.  






nice work on the quarry, and dont let that GF get away.

[Southside]

What are those Mike? 

[mike_belben]

That is the rotating group of a variable displacement piston pump, and the brass plate that it rotates against.  The 3 hole port is the discharge from each pumping element. The deeper the grooves here the more output you are leaking back to tank, so to speak. 
  

[PoginyHill]

Commutator. Same function as a commutator on a DC motor. Directs power to the proper place as the thing rotates.

[teakwood]

ramon when you tear down your pumps have a sheet of glass and a few new sheets of sandpaper available and some old gasoline for wash solvent.  brush on some oil or ATF or even WD40 to the glass to get the sandpaper to stick to the glass, then oil the paper grit side.

when you find these, resurface them to fine polished perfection and put it back together.  you are getting crossleakage on the output side of your pumping elements.  






nice work on the quarry, and dont let that GF get away.

Thanks Mike, good trick, if heard the same thing applies on the bottom of the pistons they can be revived with a light polish, we will see. I'm not quite there yet, machine works pretty good, talking to a mechanic here he has some experience with pumps and told me to first measure pressure to see where we at, so maybe I buy a good quality Chinesium gauge kit with all the adaptors. 
Quote from Volvo Miami, 7k for all the wear parts and probably need to change sealkit for the complete valve bank. Same parts in China, best available quality, 1800$ including DHL delivered to my door.

[mike_belben]

Yeah, market disruptors.  Some day china will be getting volvos price and there wont be an alternative.


Ive not seen a ton of these pumps apart but the ones i have didnt have any issue on the toggle feet that ride around on the swash plate surface.  Id hope the swash face is harder.  If either surface was chewed up im sure itd be noisy.


Your charge pump that feeds the piston pump is probably a gear roller and that could be cracked in the lobe webs, i have seen this in wheel motors 2x.  Look really close at all parts.  If the charge pump had leakage the piston pump could be going negative to suction and that would cavitate and chatter with noise.  Also wear the piston pump faster.  The fit of the plungers in the cylinder bores is obviously important too.


This all comes after looking at your pressures and relief cartridges.  If you could measure the case drain flow into a clean bucket or with an inline flow meter in front of a camera that can quantify how much oil is squeezing out thru wear pathways.  


New oil isnt all that clean and should be filtered into a machine that you really want to last.  

A procon beverage head run by a drill through a filter head and hoses would work.

[teakwood]

Had a mechanic check out the pump, the guy is good, knows his stuff, not cheap but worth his money. the pump is at 4700psi and should be 5000, but the flow is down. there is definitively oil bypassing the pistons. his verdict, rebuild pump. new pump 18k, reman 11k, parts original in costa rica 24k  ???, aftermarket american made parts 7k, original parts in Miami 8k. i would like to lower this prices, find the parts cheaper, will definitively try to find OEM kawasaki parts, which should be cheaper than renamed Volvo parts. does anybody have a source of a good hydraulic shop/ dealer/ seller?? really appreciate the help. @kiko and all the other hyd gurus in the forum. or any good AM american made brands?

It's a Kawasaki K3V 140DT pump
 

[barbender]

That is unfortunate, but you are definitely better off getting ahead of it before it fails completely. Sometimes we don't realize how central to our operation a certain machine is, until it isn't operating. I hope you find some cheaper parts!

[Log-it-up]

Try these guys out bought a skidder pump from them really reasonably priced good quality

Quality Heavy Equipment Parts for Less, Construction, Forestry, Mining, Agriculture

[kiko]

Call Hydraulix ,Seattle WA.  Ask to speak to David .  Tell him Keith from Forestry Parts Reaouce said to give him a try.  They are on Pacific time.   253 604 0400.

[teakwood]

Call Hydraulix ,Seattle WA.  Ask to speak to David .  Tell him Keith from Forestry Parts Reaouce said to give him a try.  They are on Pacific time.   253 604 0400.

After alot of research i ended up buying the quality AM from Korea from David at Hydraulix, real nice and helpful guy, thanks @kiko 
Whole pump overhaul kit with freight to miami about 2500$. 1100$ to Costa Rica and another 2000$ for the mechanic, my work and new oil, i'm pretty happy with this, 400$ for the main valve block overhaul kit, will do it right all in once.

[teakwood]

Update, we did the complete overhaul of the hydraulic pump, i left the valve bank alone as it work flawlessly and has no leak at all. Mechanic was here for about 2days and everything went smooth, was very interesting, i learned alot. the guy is not cheap but knows his business. we did measure all the pressures after a good work out in the quarry, everything is in specs, the humming, singing noise is gone and the machine response better than before. I'm a happy camper.
the old pump was still in great shape, we found nothing catastrophic
 

[kiko]

It is always great to rebuild a worn pump before catastrophic failure and a complete system clean out!

[GRANITEstateMP]

excavator is nice....but I like your truck!

[teakwood]

 :D that was the mechanics truck, i have a "vintage" 1999 diesel Hilux, the legend.

I'm selling it for 14k right now, with 350'000 km, people are crazy for what they pay for these cars