I started having problems after towing it across the yard with my truck after head gasket blew. Being new to Garden tractors I didn't know there was a bypass vavle under the seat so I may have done some internal damage. I have checked the bypass since and it is fully closed but the hydrostat oil foams up and starts pumping out the fill tube after about 10-15 minutes now. Any assistance would be greatly appreciated, it appears to have a pre 15 series hydrostat in it. Model 90-2052
I have not been able to locate any kind of service manual for this particular hydrostat.