Last Sunday I purchased what I thought was a good deal, A Weaver Vo 1000 NOS[New Old Stock] with little to no run time based on observations of the wheel and roller pick-ups conditions. For the price, worst case scenario was to replace the electronics with ERR and I would still be ahead of the MFg's MSRP.
I get home and take it out of its box and place it on a test track. Sounds started right up,
However when placed forward or reverse, the motors immediately started to torque out.
I applied the power slowly so I wouldn't damage the motors and/or electronics.
Well after doing this a couple of times I knew there was a real problem so I took the trucks off figuring the motor gear had no lube and/or the motor was not mounted right to its transverse gear. Well I got the truck off and much to mu surprise, there was enough factory lube but the transferse gear nor the wheels were not spinning.
Taking off the transverse axle/gear assembly I see the sleeve bearings were literally stuck to the axle. NO rust but some sort of gooey substance was making the sleeve bearings stick and not rotate freely on the axle. Same with the wheels.
This was the first time I ever experienced this. To fix it, I ended up prying the bearings loose while not scratching the axle. I used goo gone to rid of the sticky substance left on the axle. I then coated the axle with lite oil. Then using my syringe, I squirted Red and Tacky grease on the bearings and did the same for the wheel sets with their bearings.
The savior was that the weaver truck blocks have a metal plate underneath to come off and allows access to the wheel/axle/gear assembly. For the wheel axles though, I greased the inside of the axle seat as well as light oil lubed the sleeve bearings. NOw she runs like a champ - at least in Conventional control. 
I've taken apart stuff that it was solid like that. Cleaning it all out and properly lubricating normally gets them back on the rails.
She's a sweetheart.
)