I bought a 4 year old JD 125 from a lady down the road. She had it serviced every year by a mobile service center. Cuts fine but has always had one problem. No speed. I drove it home from her house a mile down the road. I has to mash the medal to the floor just to get minimal speed out of it. Never has much speed. Sounds fine when running and cuts great. Drive belt seems very sloppy when shut down. Not sure if belt is the issue, a spring or bad hydrostatic trans. Same problem in reverse, only really one speed. Anyone who has a similar experience or can give me the idea what is wrong with it. Currently only 113 hours. I bought it with 80 hours on it. Thanks in advance!