My 743 runs good but it has always had a pretty loud noise coming from the hydraulic pump. When it ildes it seems to be louder. It is especially loud when it is sitting still almost a growling sound. I do need to adjust the creep on the machine so when it is stationary it does have a load on the system due to the steering creep. Also is there anyway to tell what the problem is that is causing the noise. The question is how loud is too loud and telling me it has a problem. The machine is a 1986 model that I have owned for around 5 years. I have no idea how many hours are on the motor but it started a couple of weeks ago at 10 degrees F with 30 seconds glow first crank.