Just picked one up with a 48" mower on the back. I see it has a differential, but how exactly to you engage this?

Also any mechanical problems to look for? I used it this weekend and it is slow but can haul with the low torque.

 

I just picked up a 1988 Terrapro this weekend. No manual or anything but I figured a few things out. The PTO will only work with the atv in Low. You have to push the throttle (handle on the left hand fender) forward to increase the RPM. Then engage the PTO.