WHEEL LOCK IS NOT PERMITTED! I greased the visible bearings and greased the wheel axles. Toddlers can now roll a 100-pound portable generator. I have a few ideas for repairing the generator on the spot. It was a rewarding experience. It is FORBIDDEN to attach 4 swivel wheels to the generator! Rolls down every slope. You take one end and the other end goes. In all my 75 years, I've just never seen anything like it. You are great in the apartment! BUT locking wheels don't lock! Period! Most heavy things have two solid wheels. LAUGH OUT LOUD! now i know why Then a crumpled rag will not roll. Surprisingly, when the generator is running, the wheels do not move on a flat surface. I DID NOT RECEIVE THE KEY.