I have been looking at a New Holland L779. It seems to be in good shape with a gas motor. The boom and tip hyd. are quite and operate as they should. The issue is when I engage the travel levers the drive motors make a loud noise. It doesn't make any difference if going straight or turning they howl or make noise. The best i can describe is like a car power steering pump running low on fluid. It appears the drive system on these are fairly complicated and very expensive to work on. The pressure light is off and fluid tank is up to level. It is loud enough to be heard maybe a hundred feet or more away. Is this normal on these? Any suggestions on cause? It is 100 miles away so not able to do any testing on it. The New Holland dealer here says run away. I am also going to go look at a L785 with a Perkins next week the guy says it is in good shape but about twice the cost of the 779. I am not familiar with the sounds of the hydrostatic drives. I have a Melrose 610 I have had for years and it is very quite while traveling or turning. Thanks Larry