1572 is leaking fluid out the top of steering column

[NBMIKE]

I don't know why my last post is not here but Iam going to try again . I replaced the top bushing as the old one was no longer sealing tightly to shaft. I used it and did not have any more leaks until tonight. I mounted my snowblower and cleared away the snow and noticed fluid running down the column again and pooling on the hydro cover. It seems to happened only when the tractor is working under a good load. Does anyone know what is going on with this tractor. Do I need to replace all the seals and can I just top up the fluid until spring when the weather is better to work on it. Is there a lower seal kit that I should replace. Please advise me if you can