Hi everyone. Today i found after a few harder (applying more torque) flights that my main gear was rubbing on the pinion collar. My kit came with the one way bearing installed in the hub backwards. My hub is not a 100% symmetrical, there was approximately .040" difference in clearance to the pinion collar with the pinion seated against the third bearing block radial bearing when i flipped the gear and hub assembly over to test fit. When higher torque is applied to the slanted gear the motor shaft will want to push down hence the pinon setting on the third bearing block and the main gear will flex up towards the pinion collar. You could fix this one of two ways.
First, if you happen to have a arbor press or larger jawed bench vice laying around you can simply and carefully remove the one way bearing and flop it around. This is what i did to mine. VERY important though is to have a very close fitting outside bushing so you do not bend the hub mounting ears and only apply pressure the one way bearing on the side that has the writing and direction arrow. This side is the flatter side so you stand less of a chance to damage the roller guides on the inside of the bearing housing. Second VERY important step is to heat the hub assembly from the outside with a heat gun. The hub is aluminum and the bearing housing is steel so they have two separate properties for heat expansion(aluminum faster than steel). First you need to remove the brass spacers from the hub so heating it is necessary to release the locktite bond. I had to work them out from the opposite side using something to catch the spacers inner radius edge and worked it around until i could get them out. Now with moderate pressure you can push the one way bearing out(heating as you need to)not too much though because of the plastic roller guides inside the one way bearing. The one way has a very close interference fit with the hub so be careful. Now that you have the bearing out, let it cool back to room temperature. When it is cool, throw it in the freezer for about an hour or so(shrinks the bearing). When you are ready to re-install it back in the hub get it from the freezer, make sure it is in the correct direction, reheat the hub assembly and start to re-install it. Once you get the bearing past the lip of the hub, get your two brass spacers and install them WITH LOCKTITE and finish pressing the bearing into the hub until the brass bushing are flush with the outer edges of the hub. Let the hub cool down before installing on the main gear as per the manual. Now you can reassemble everything back together. Now I have plenty of clearance without any chance of rubbing.
Second. If you happen to have a 6mm inside diameter shim laying around in your parts bin, you can use that between your pinion and your third bearing block radial bearing. The shim can't be very wide though. You only want the shim as wide as the radial bearing inner flange or it could rub on the bearings grease seal plate.
Like i said, this is what happened with mine that had the one way bearing installed backwards. Yours could be backwards and still have enough clearance not to rub on the main gear. If you do have a rubbing problem and care to fix it and not just let it wear off, then I hope I was able to help with the process.
E6 on 12s with Microbeast X, Rails all around and LOVING it!
