I just took delivery of a new Bobcat CT2040. While going up my somewhat long and steep driveway it bogged down to a standstill in high range. Shifting to medium moved the tractor along at a reasonable pace but seemed strained. Low range is extremely slow and not much good for getting from one place to another. It was in 4WD with about 1/3 throttle. There were no attachments on the tractor except for the front end loader. Is this normal? Should I be concerned? The John Deere 855 that I had before was much quicker and seemed to perform much better under the same circumstances with almost half the horsepower.