We assembled a gearbox, applied power and discovered that the Waldes retainer washer sits on the CIM motor shaft such that is “scored” the large gear. It appears the retainer is a fraction larger than the diameter of the motor shaft. No real damage but we are concerned. We followed the assembly directions to the letter. Anyone experience the same thing? Any thoughts? Thanks for your help.
Please refer to this thread in the ifirobotics forum: http://www.ifirobotics.com/forum/viewtopic.php?t=175
-Paul
P.S. - The scoring should not hurt anything. I scored one of the gears during my initial fit verification and there was no adverse affect.
Thank you kindly sir. You are a scholar and a gentleman (and there are darn few of us left). 
We are having a problem with our gear box. When we test run it, there’s a grinding noise and we can’t seem to find what the problem is. Can anyone help us figure out what it may be?
Did you grease it up?
Our gearbox made grinding noises when greased with a light (low viscosity) oil. Since lubeing it up with thick white lithium grease it sounds like a champ. Make sure that you lubricate it appropriately to ensure good efficiency and longevity.
Rob
hey idk if this is what ur looking for but rember u are not suposed to have in the set screw in or if u do its suposed to be a smaller one so that it doesnt catch, if u have it in take it out and it will work fine(we had the same problem) … u can really tell if its the set screw if it sounds like somthing is grinding…
hope thats what u want
Squeje250