John,

The crankcase oil fills the pan and starts to drip after 5 to 10 hours of use. I shut off the fuel when I am not using the tractor. Basically, the tractor needs to be fixed. 

I have the service parts manual for the injector pump. I do not see an O-ring that should leak fuel. Is there some oil seal on the quill or gear case under the hydraulic head that can leak fuel down?  The injector pump doesn't have a pre-pump on the side with an oil seal (I have had the pre-pump leak on another tractor before).

Can you provide some insight? 

John from KC