The zipper open access panels will not give you enough room to service the system. ours were rusted solid. Honey, Its Stuck! Open it a lot, give yourself rooooom.
I had to cut a much larger opening through the underbelly fabric, fold back the insulation do the gear replacement then reseal the underbelly fabric with 3 M super 77 spray contact cement and more fabric as a 'tape'
Carriage slideout gears and jacks
were made by RBW, sold to Dexter, then to Coachworks. New parts are exclusive to Coachworks and $$$. $$$ $ and then some. Salvage parts do not serve any better as the same issues are present.
The motors and drives are for us are good, its the gearing and engagement that failed A wrench job , maybe a welding job to rebuild the sprocket, most importantly rearrange spacers and bushings to fully engage the sprocket on the rack gear.