There is a nut in the handle mechanism that needs to be snugged up (adjusted). There is an exploded view of this faucet at http://www.moen.com/shared/pdf/7430pt.pdf
Let me know if I can help you further, -CompuWayne
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MoenMonticello 4-inch centerset bath faucets can be repair easily with only a screwdriver and adjustable wrench. Turn the water off to the both sides of the faucets under the sink. Open both the hot and cold-water valves to alleviate any remaining pressure. Remove the handles by grasping the base of the handle and turning it counterclockwise.( This works for both lever and cross handles). Loosen the Moen faucet cartridge bonnet nut with an adjustable wrench by turning it counterclockwise to the left. Pull the stem from the faucet by hand and replace. Reinstall the bonnet nuts and handles. Turn the water back on and test the faucet for leaks. The Moen Monticello faucet comes with a limited lifetime warranty. Try calling Moen to get your replacement parts free.
It may just be that you need a new cartridge. If you can replace cartridge without to much problem I would do that. Depending on your water quality the cartridge may be very hard to remove on a faucet that old. Also if the handle actuating hole is worn very much you may have to replace it also. By the time you buy parts you may have half or more of the price of new faucet, I would recommend that you replace faucet. Hope this helps. Thanks
The hot side sounds like it has some junk in the hot side blocking the hot water from coming through check hot water line to make sure that it is coming through down below and if so you would need to take it apart and try to get the junk out of that side of the faucet.
The water supply should have no bearing on the working motion of the faucet cartridge or handle. On both models of Moen faucet, the handle needs to be hooked under the cartridge's top cam bearing. It is a bit tricky sometimes. Here's the parts view for 7300 and 7310Moen Kitchen faucet. Parts view for 7100 Moen.
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That's easy! My husband is a plumber. he says u have to take the lever off. Point the tip of the lever down and put back on. There's a little ledge of plastic that u have to get the metal handle on. It's difficult to explain!
I had the same problem with my Aberdeen single lever with a pull-out sprayer a few months back. If you are the original owner of the faucet, it's under warranty; you shouldn't have to pay for any parts. Call: 1-800-BUY-MOEN (1-800-289-6636) and tell Customer Service what the problem is. They will send you the Handle Mechanism Kit at no charge. (Mine was part #93980 for my Aberdeen faucet, but yours may be a different part number.) It's tricky to take apart and get back together but my husband and I have zero plumbing experience and got it all fixed in about 20 minutes. The Moen.com website also has exploded parts diagrams of all their faucets so you can identify exactly what part you need, and they have some little videos and slideshows to show how to replace parts. If you can't reach Customer Service on the phone, you can go to "Contact Us" on their website and email them a description of your problem.