hifi engine

Sony TC540

I need some information. I recently bought a Sony Reel to Reel #TC540. The 540 I was told is similar to the TC530 and 560. I am able to get the forward and reverse to work but the Fly Wheel is not working. It appears the Idler Capsten wheel to too small and does not make contact when put into play. When I first received the machine I noticed someone was inside because several cabinet screws were missing. Upon inspection I found rubber dust, dried up grease, and springs that were stretched. The metal inside was pitted inside. I am still cleaning and will use silicone grease. Does the flywheel have a separate motor or does it run off the idler wheel? The diameter of the wheel is 2" but appear too small. Any ideas? Bob