Cat 980g implement pump nightmare

Lets start here. Serial number 2kr03824
980g series I

About 3 weeks ago we had lost the implement pump on the 980g. Pulled it apart discovered it had broken one of the small 1/4 inch Allen bolts holding the larger cartridge together(vane pump) and blew out the o ring seals on that end of it.

Got a brand new cartridge and seals installed everything and it seemed fine.

The pump somewhat whinned from the beginning at higher rpms but seemed okay otherwise. Less than 15 hours later it **** the bed. Pulled it apart to find the new cartridge basically looked Like it was starved of oil which was most definitely not the case. This time we replaced the large and small cartridge with reman units from cat. The first cartridge was also a reman cat which we thought was a bad egg essentially. This time we also soaked the cartridges in 10 wt to make sure they were lubed on start up.

Here we are less than 10 hours later its fucked again.

I'm a pretty experienced mechanic filters have been changed, correct oil in machine ect. What am I missing???? Or are cat reman catridges just junk?

Vane pumps on the 980g are a known problem with Cat. I had one fail 2 pumps in a row so I talked to the cat hydraulic tech services. He said the big pump is only rate to withstand 2500 psi and the 980 runs 3000. There is a gear pump change up to fix this which we did and had no more problems.
The only other thing you can do is make sure the pressure relief is set to no more than 3000 psi. The vane pump will survive at that pressure but any higher it will fail prematurely

I'll call the cat tech line today then and see about a gear pump.

Well same exact failure of this second reman cartridge as the first reman cartridge. Vanes look like hack saw teeth on the tips. I drained my tank and opened it up and found no contaminants and trash. Went ahead and ordered a complete brand new pump from cat 3200 plus 400 shipping versus the gear conversion for 8k

It is starting to sound like the vane cartridge might have been put in backwards. You might re-check the book to see which way the vanes are supposed to point in relation to rotation of the pump drive.

I fully understand the idea of the vane pumps limitations causing an early failure but unless the operator stalled the hydraulics out and ran it against the relief valve for those 15 hours I'm having a problem with a failure at that short a time. Now that I went back and reread it I'm seeing one replacement lasted 15 hours and the next 10 hours, if I did read that right.

The whining as soon as it was replaced sure does not sound right, old worn out vane pumps whine new vane pump are very quiet. I'm not there but I would be checking the suction lines very close. Just guessing as I'm not there, but a small suction leak letting air into a pump can cause noise and would possibly lead to early failure. I'd also be looking at any possible restrictions on the suction side of the pump. And like Mobiltech says check the relief pressure settings!
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This got me thinking about the 980G were I worked, actually very close to this on ours is a 2KR3066 this one is a 2KR3824. We did have a failure of the vane pump on that one at just under 10,000 hours and at that time it was upgraded to the gear pumps. So yes the vane pumps can be short lived but ours lasted close to 1,000 times longer than this one so there is for sure either a problem in the pump or the system in general. I'm having a hard time putting the blame on the operator, but I have known some who could rip the cutting edge of a 980G loading marshmallows!

New pump was installed a while ago. Checked relief pressure and it was 700 psi over spec! Got that back to where it should be and so far it seems good. What's strange is the relief pressure has never. Wen touched by us. We have had this machine since 2004. The vane pump that was in it had 18220 hours on it at failure.

is the probelm of pump failure is resolved

Yes new pump and adjusted pressure fixed it

just ensure the pump discharge line stariner is cleaned if the systum has