My 30 year old Troy Bilt horse isn't so happy. I'm chagrined to say that the gear oil has probably never been topped off. The tine end makes some awful noises. It still runs. I pulled the cover and the drive shaft on the front has some sharp edges on the screw, the oil level was so low that nothing got to the rear. I think I can get life though. The drive shaft moves back and forth, this is visable from the two pulleys going in and out. If I can keep them back it seems to turn bu hand OK. Any thoughts? Thanks.