Hello everyone. This is my first post. Hopefully this will sound familiar to somebody. I have a 2000 model New Holland LS150. Recently the bucket started dropping on its own while running it after I would tilt it back toward the cab. Shortly thereafter, the Hydrostatic Pressure light came on and shut the engine down. I checked the repair manual and everything lead to the control valve - mostl likely a check valve. Now the fluid level was full, and I had recently changed the hydraulic filter, so I ruled that out. I also checked the hysdrostatic presure sensor, and it seemed to ohm out o.k. SO set about the daunting task of removing the control valve and disassembling it - looking for a stuck check valve or broken breng or bad o-ring. Everything looked clean except for two tiny pieces of rubber - they looked like part of a seal or gasket, not and o-ring - were found floating around in there. They must have come from somewhere, but I couldn't find where. Anyway, I put it all back together, topped off the fluid and fired it up. I got the same reuslt with the bucket dropping back down on it own. Only this time, the alarm light didn't go off. I checked a few more things. The boom lifts up and down and holds o.k. Obviously the bucket tilts back ok. It also tilts forwards with input from the pedal. I even lowered it - tilted it forward - until it picked up the front tires and it held in place. What gives? Is there something internal wrong with the valve? Or is there something else I'm missing? I have confirmed there are no external leaks, as well. Any help would be grealty appreciated.
