We are new to owning a bobcat. It's a model 763 (1984). We observed a significant amount of oil under the cab and after troublleshooting, it appears to occur only when tilting the bucket and more pronounced at higher throttle. When at higher throttle, significant oil comes out of the hydraulic tank cap. Tank level has gone from full to 1/3 after 5 hours run time, although the leak may just have started. Is there a defective check valve or back flow prevention valve that would cause this to happen? We have narrowed it down to this, but any additional help is appreciated. Thanks
