and i realy would like to find a free or cheap repair manual for it

wrong link sorry. its; http://providence.craigslist.org/grd/1729815563.html

This is not unheard of, the natural design of a good belt drive system does tend to favor the drive pulley and a single direction of rotation. However, I have a bunch of Wheel Horses and mow some pretty good hills without experiencing this problem. Different years and models, some with wheel weights, etc. - none have this problem. Does your tractor have the "anti-wheely" hydraulic type dampener on the clutch (located under the belt guard) - if so remove it and see if the problem disappears. Up to you whether to replace it or leave it off. The fact that you said manually pulling up on the pedal does not improve the situation tells me something is likely limiting the travel of the clutch arm and idler pulley, not allowing sufficient tension on the belt. Did you use a Wheel Horse belt? If it is an aftermarket belt, a little too much length will still allow the engine to drive the tractor but could allow the problem you have. Check the roll pin on the left side where the short clutch actuating arm attaches to the cross shaft. I have seen this pin shear but the clutch seem to work reasonably well for a period of time due to corrosion, the joint relying simply on the friction between the parts. I'm sure you could tell the difference between a "limited" degree of free motion and full-on slippage, but you might check the keys and keyways in the drive pulley and your wheel hubs to be sure all is well there. I don't think it is likely there is any problem inside the transaxle that could cause these symptoms. Might also check for a leaking seal on the transaxle input shaft, causing gear lube to make it's way to the belt groove in the rear pulley. However, I know I have this problem on my 520-8 yet it still pulls fine and does not run away down hills. My best guess is that something is blocking full travel of the clutch arm, and if so equipped, I'd be real suspicious of that clutch dampener unit. Best of luck and let us know what you find! Ed

Thanks rcbe for the additional info. I will reserve this task for winter. Single cylinder Kohler engine. When it shuts down, it is evident there is a kill in the ignition. ID Number: 2110K805, 27917 Kohler 10hp: Model# M10S, 461521, Serial 1720406823 Tractor Model Number 05-42MR04