That's the same one I use on my EQ5.
Even at the highest speed you won't notice the gears moving too fast, but they do move - particularly the RA axis.
You need to make sure you tightened the knurled silver locking screws to engage the brass-coloured metal cog with its matching cog. (hope that makes sense?)
Also, make sure you've firmly locked down the RA and Dec locking levers on your mount
Just make sure you've also plugged the right RA and Dec leads into the correct sockets. The hand controller will still work, but it will all be reversed ie the RA buttons will now control Dec movement and vice-versa