Troll motor help- N. Wisc
Take the prop off. Behind the prop there should be two bolts. Just loosen those up slightly but don't take them all the way out. If water starts running out of the motor you have bad seals. Seals are pretty simple to replace but can sometimes be a bit tricky if you lack patience. The first set I replaced on a motor took around 45 minutes. Once I got the hang of doing it the time spent replacing them has dropped and I've done them on the water for guys in under 10 minutes.
It could be something else as well but if water comes out of your motor after loosening up those bolts behind the prop you have your issue diagnosed. Then if you take it somewhere to be serviced you've saved yourself a few bucks in labor charges because they don't have to diagnose it, you already have.