Case 580b hydraulic problems

[gyman98]

sorry for the long winded post, just want to have as much info out there as possible.

I recently bought a 580B backhoe for a good price as it had been sitting for a number of years. The previous owner had said he lost hydraulic pressure and removed the pump to get it repaired, he then lost the pump.

I got it running and brought it home , found a used pump that the guy says worked fine before he dismantled the machine. Put it on and seems like not enough pressure, can’t move most circuits, I put a gauge in the main loader valve as seen in the picture. Getting 400-500psi at most.

I also removed what I think is the relief valve, disassembled it and cleaned it and reinstalled. No change

Anyone have any ideas?

 

[Tinkerer]

There are many things that can cause your problem.
Did you change the filter ?
Go here and download the service manual. ---->http://www.minnparbackhoeparts.com/...HOE MANUALS&SFName=CNH (CASE) Service Manuals

 

[Tinkerer]

There are many things that can cause your problem.
Did you change the filter ?
Go here and download the service manual. ---->http://www.minnparbackhoeparts.com/catalogs3.asp?FName=BACKHOE MANUALS&SFName=CNH (CASE) Service Manuals

 

[gyman98]

Yes new filter, fluid level is good, breathers are good, suction line is tight and new.


Thanks for the link, trying to download the manual now