I’m new to the tractor world and just purchased a used B9200 kubota. Engine runs great, bucket works pretty well for a 20+ year tractor but the wheels lose power when I try to scoop a bucket of sand or dirt or anything really. Thought it may be fluid but they all look decent. It runs better after warming up but still the power to the wheels stops when pushing. The guy I bought it from told me it needed a high pressure pump or valve or something for other implements to operate. Any advice would be much appreciated. Thanks