L555 Hyd Charge problem

[bbill]

I have a New Holland L555 loader I bought used two years back and has 3000 hrs. on it. Shortly after I got it the Hyd Charge light/buzzer would come on at random times while driving it. All of the hydraulics would stop working and loud noises could be heard. I would stop the loader and let the engine run. The noises would stop while I was not moving. The Hyd Charge light would eventually go out and everything returned to normal. The light might stay on for several seconds or it might be a minute before it stopped buzzing. The filters have been changed, the filter screen on the right side of the seat is clean and the dipstick shows oil near the full mark. Two years later it still does this without any apparent damage although it is annoying. I don't use it much, about 200 hrs since I bought it. What I've noticed over time is it will most likely do this after everything is warmed up and I'm either turning around or making a sharp turn. I've tried bringing the engine back to idle and revving it back up. I've sat there and waited until the light went off, and I tried shutting off the engine, waiting a little bit and starting it up again. Nothing seems to work. The light seems to go off when it feels like it. I am no expert on hydraulic systems, but I don't think it would act this way if it is a pump problem. Any advice is appreciated. Thanks, Bill

 

[Clone]

If your loader (boom and tilt) still operate at normal speed I would say your hyd. pump is good. It also is supplying oil (charge pressure) to the drive pumps. Sounds like the light/buzzer is giving you actual indication by the cavitation noise you are probably hearing of the drive pumps. I would say the drive pumps are leaking internally back to the case drain and the hyd. pump is having a hard time keeping up. I would recommend you post this in the New Holland section further down the main forum page. New Holland resident expert Mike10 only watches that section. He will get you lined out. Until he can give you advice, here is a great thread of how to test your drive pump leakage. Several pages of reading! http://www.skidsteerforum.com/DesktopDefault.aspx?tabid=54&frmView=ShowPost&PostID=82681

 

[bbill]

If your loader (boom and tilt) still operate at normal speed I would say your hyd. pump is good. It also is supplying oil (charge pressure) to the drive pumps. Sounds like the light/buzzer is giving you actual indication by the cavitation noise you are probably hearing of the drive pumps. I would say the drive pumps are leaking internally back to the case drain and the hyd. pump is having a hard time keeping up. I would recommend you post this in the New Holland section further down the main forum page. New Holland resident expert Mike10 only watches that section. He will get you lined out. Until he can give you advice, here is a great thread of how to test your drive pump leakage. Several pages of reading! http://www.skidsteerforum.com/DesktopDefault.aspx?tabid=54&frmView=ShowPost&PostID=82681

I want to apologize for posting my New Holland problem in the Bobcat section. Among my many faults is not paying close enough attention to computer related things. Thanks for pointing out my mistake, Bill