hydrualic leak, repaired, filled but no hydrualics

[parkscar]

My Case 580K had a substantial leak on the return side of the hydraulic pump. After changing out the short rubber hose and filling the reservoir with fluid and running the engine for a little while (did not want to run it too long) the hydraulics still do not work, i.e., bucket, hoe, outriggers. Does it just take time for the air to be bled out. Any suggestions would be appreciated. Thanks

Parks Car

 

[TOMLESCOEQUIP]

Open the top of your hyd, res, .& use a rag and air hose/blowgun to pressurize the hyd tank while the hoe is idleing. That will force the oil to the pump. With the return off, you have gotten air in the system instead of oil, which causes cavitation of the pump & makes what ever oil is there to foam, & the hyd pump will lose prime. A little air pressure in the oil tank will force the oil to the pump. ONLY at idle !! High rpm will just make the foam/cavitation worse. Try it .......Good luck........Tom

 

[CT_Tree_Guy]

Hiya Parks Car, welcome to TBN. /forums/images/graemlins/smile.gif

I don't want to appear to take away anything from what Tom just said - he really knows his stuff, and his procedure can only help, not hurt, your situation.

I just wanted to offer an observation that hydraulics in general seem to be very forgiving about getting themselves going again after having been disturbed. Sometimes they just need a little time to think things over, and if you don't hear a lot of loud groaning coming from the pump which would indicate some serious cavitation going on, they should come back to life without too much coaxing. As Tom said, a nice low-ish idle, maybe 1200 or so, is probably going to be better than a high idle, but a little bit of "revving" might not hurt to much either, just to get the fluid moving around some. I think that your machine will come to life after you move a few levers around and give the pump a chance to start pumping again. Again, listen for cavitation, and if you hear to much "groaning" for comfort, maybe try to fill up that return hose with fluid to help prime the pump.

Hope this helps, John