I've got an older (10,000 hour) c5000 that I purchased used. Everything looks and works well except that when I creep in forward or reverse by releasing the inching pedal, the wheels stutter and creak at very low speeds. The noise and jittering goes away when I get going a little faster. My suspicion is that the brakes are dragging, but I don't know if pulling the wheels off is the first good step. Any advice before I take it in for service?