6/14/2014 7:06 AM
Not sure if this will help. Our 4000 had a reverse problem a few years back. There is a hydraulic block located under the radiator. There is a few check valves in the block you can turn out. Each check valve has 3-4 o-rings on them. In our case the one check valve, facing the rear of the machine, had two bad o-rings on it. Problem fixed with new o-rings. Not sure if I would have ever found this without the help of the service department at MTI Distributing.
Hope this helps