Dobsonian Orion 10 go to intermitten

I purchased a Dobsonian 10 Orion with go to . The person I purchased it from had a wealth of information who showed me how to use it before I took it home .
I’ve used it a few times and now when I press the remote for the telescope to go down , it stops at around 60°, or sometimes it won’t move down at all, all the other directions work fine . He advised me that with this telescope I could also just move it manually wherever I wanted , when I do this it seems to creek and not move very fluidly , it seems to me ( new to all of this ) that I would need to disengage the motors to keep from messing them up but he said this model was one of the few you can just move it. What can I check or do so that it can move down with the remote ?