Although the Moen website does not list any entries for the M7500 series of faucets, this series is identified on merchant sites as being part of the Chateau kitchen faucet collection--the 7400 series on the Moen site. The faucets in the 7400 series feature a chrome finish, swivel spout and single-handle operation. Faucets in the Chateau collection come with an optional side spray attachment. The valve contains a Moen 1255 cartridge that requires periodic replacement to keep the faucet in good working order. Replacing one requires just a few simple tools.
Things You'll Need
Turn off the water to the faucet by turning off the shutoff valves under the sink. Open the faucet and let the water drain.
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Pry off the button that hides the retaining screw for the handle with a slot screwdriver. It is on the body of the handle, just under the lever.
Unscrew the retaining screw with an Allen wrench and remove it. Pull the handle off the end of the valve stem, then pull off the dome that hides the retaining nut for the cartridge.
Unscrew the cartridge retaining nut with slip-lock pliers. Discard the nut when you remove it because you'll have to use a new nut for the new cartridge. The cartridge and nut are supplied together.
Grip the end of the valve stem with the pliers and pull it straight out. Drop the new cartridge into the valve seat in the same orientation as the old one was in.
Screw the new nut onto the valve seat to hold the cartridge and tighten it with slip-lock pliers. Drop the dome back in place, then fit the handle onto the end of the valve stem and screw in the retaining screw. Snap the plug back into place with your fingers to hide the screw.
Turn the water back on and test the faucet.
If the cartridge has been in place for a long time, you may find it hard to pull out. If the pliers don't work, use a cartridge puller, available at hardware stores and plumbing suppliers.
The water must be off before you remove the cartridge or you may be scalded by hot water.