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There have been at least 2 different versions of the 7590C... on one version there's a plug on the 'back' (180 degrees from the handle) that covers a horizontal set screw, and on another version there's a cap on top that pries off and covers a vertical mounting screw.
If you call Moen they will provide you with detailed repair instructions. In Canada 800 465 6130 and if not in Canada that number might redirect you OR any Moen retailer can get you the appropriate toll free niumber for your area.
Probably a loose fixture nut under the counter behind the sink.
Yeah ya gotta pull out everything and crawl up into the cabinet on your back and see if the nut (right up at the granite, above the hot and cold inlet pipes) is loose. If it is THEN you'll need to tighten it. Wrench, slip-joint pliers or a basin wrench. (probably basin wrench which is a specialized tool made for reaching up into tight places)
on the ergonomic handle design the vibration will sometimes cause one of the switch leads to come loose. Remove the handle tube. Lay the handle tube flat on a bench or table and remove all the handle screws. Work handle haves apart and you will be able to see if the switch leads are loose. If not, the wires inside the power plug may have become separated by somebody yanking on the cord, rather than pulling the plug. With a meter or test light, you can check continuity between the plug and handle wiring. The only thing left is the motor, but let your local repair guy do this, because it can be a bear to get out and re-installed.
I noticed the same thing myself. I had set the handle in the upright position, and laid the cleaner on the table to remove the rolloer brush. When I re-installed it I noticed the belt was really loose.
I checked several things before I finally lowered the handle to the operating position. This tightened the belt up, which makes sense when you stop and think about it. If you sit the handle upright to use an attachment you don't want the roller brush working away at your carpet when you don't need it.
Placing the handle upright disengages the roller brush by loosening the drive belt.