Originally Posted by Chuck Sartor:
I have found that once the wheels have loosened or been pulled off the axle they will never grip the axle well again, the wheel should be replaced. there are 2 671 motor armatures, and one has to be careful when ordering / replacing these. If all the above suggestions/offers don't pan out, you can send it to me and it will come back correctly repaired.
Chuck
I believe I solved the wheel issue by replacing the frame/wheel assembly.
The service manual doesn't mention different armatures. Is it a shaft length difference or something else?