Hey all, I recently changed the hydraulic oil and filter on my 743 bobcat. I cycled all the air out and got the bobcat operating perfectly for multiple hours yesterday. However today it is making a horrible squealing noise when operating the lift, tilt and auxiliary functions. It has little to no power lifting whilst making this noise. It almost sounds like the pump can't get any oil. Could there be any blocked filters causing this problem? seems odd that it worked fine straight after the service. Any help would be greatly appreciated Cheers