I have a customer with a Blue Giant walker, getting a click or small knock from under the control handle, took covers off seems like motor might have a bit of movement and the fan doesn't look like it spinning straight but before i got hauling motors apart to check fans and bearings etc was wondering if anyone is familiar with these stackers and maybe able to point me in the right direction, then noise is comming from what feels like right under the handle it is cyclic in forward or reverse drive wheel is good condition, the only other thing i never checked was the brake and the air gap on that.

Any help is greatly appreciated!
Cheers