How to repair filter queen majestic?

Hello, I have had my filter queen for about ten years now. I haven't had any major problems with it until now. The motor in the main casing is working but the bottom assemble will not. On the handle there is a plug that the cord for the bottom assembly plugs into, it was very loose and the plug would not stay in, I replaced the plug tonight. It did not work. I also replace the belt. I have removed the motor and cleaned it out. I do this periodically to keep it running the way it should. I couldn't remember whitch way the motor went back in. Could you send a diagram of the proper assembly. I wonder if I put the motor in upside down? The writting on the motor should be facing the top? Any way, if you could send any sugestions about what I could have done, it would be greatly appreciated. I have two filter queen vaccuums, I got a BOGO deal, I have traded the motors and it is not the motor. They were both working. I think it may be the short cord that is attached to the hose that connects to the canister housing. It seems too loose. I don't know. Can you help me please. Thank you for your time Karen Kelley.