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

My favorite way to clean that gook is to drain the contaminated stuff out....let it drip overnight or over a week. Put the plug back in and fill it to the normal level with kerosene or diesel fuel. Raise one wheel off the ground and run the tractor in low gear for about 10 minutes. Drop that wheel to the ground and raise the other wheel off the ground. Run in reverse for about 10 more minutes. Drain the rear end and let it drip for a day or so. Fill to the correct level with 85 W 140 gear oil.

Attachments/Accessories List Model/Part Number Description Comments 07-11BC02 11.0 cu. ft. Easy Twin Bagger - 37" For use with 37" mower. No Longer Available. 110933 Cleat Tires Ass'y L.H. Current Model Available: 110933 110934 Cleat Tires Ass'y R.H. Current Model Available: 110934 114426 6" Chrome Logo Hub Cap Current Model Available: 107-9223 (No logo.) Original Model Supersedes To: 107-9223 (No logo.) 114428 12" Chrome Logo Hub Cap Current Model Available: 114428 361-10 Red Spray Paint - Case of 6 Current Model Available: 361-10 361-11 Red Paint - Gallon Can Current Model Available: 361-11 361-8 Black Spray Paint - Case of 6 Current Model Available: 361-8 5340 Red Paint - Quart Can Current Model Available: 5340 78305 36" Rear Discharge Mower Current Model Available: 78305 78315 37" Side Discharge Mower No Longer Available. 78345 42" Side Discharge Mower Current Model Available: 78345 78350 42" Rear Discharge Mower Current Model Available: 78350 78355 42" Recycler Mower No Longer Available. 78360 48" Side Discharge Mower Current Model Available: 78361 Original Model Supersedes To: 78361 79301 11.0 cu. ft. Vac Bagger - 42"/48" For use with Side Discharge 42"/48" mower; use with 42" mower only, 312-8. Current Model Available: 79301 79350 48" Snow/Dozer Blade Tire chains and wheel weights recommended. Current Model Available: 79364 (79364 requires Adapter Kit 105-1501.) Original Model Supersedes To: 79364 (79364 requires Adapter Kit 105-1501.) 79351 50" Mid-mount Grader Blade Rear weights and chains or cleat tires recommended. No Longer Available. 79360 42" Snowthrower Tire chains and wheel weights recommended. Current Model Available: 79362 Original Model Supersedes To: 79362 79361 44" Two-Stage Snowthrower Tire chains and wheel weights recommended. No Longer Available. 79370 36" Tiller Rear weights and chains or cleat tires recommended. Current Model Available: 79370 79380 Front Mower Carrier Requires Side Discharge 42"/48" Mower. No Longer Available. 80338 Silver Spray Paint - Case of 6 No Longer Available. 80494 HD. Wheels and Spindles Cannot be used with 37" mower. No Longer Available. 80733 Dual Wheel Adapter 8 Speed No Longer Available. 81115 12" Rear Wheel Weights Current Model Available: 81115 81117 12" Flush MountRear Wheel Weights Current Model Available: 81117 81125 Front Frame Weight Kit Current Model Available: 81125 82521 Tire Chains 23x8.50-12 Current Model Available: 82521 83300 Auxiliary Fuel Tank Current Model Available: 83300 84225 Electric Lift No Longer Available. 85501 Leaf Baffle Kit, 42" Side Discharge Mower Current Model Available: 85501 85518 Clevis Hitch Non-ground-engaging implements only, unless 4 additional differential pinions are installed. Current Model Available: 85518 86001 Recycler Kit, 42" RD Mower Current Model Available: 86001 -Deerslayer

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