Question about Moen 8780 Commercial Two Handle Kitchen Faucet
First thing first, contact Moen at 1-800-Buy Moen, tell them the model # of the faucet and what is leaking. They back their products well and will send you an O-ring kit to fix the issue. That being said, there are 2 O-rings under the cap in the middle, on top of the spout. When you talk to Moen ask them to send an exploded view and user's manual for the faucet so you can see exactly how it all goes together. This model had two variations over the span of production in that the center cap can either pop off with a screwdriver or needs to be twisted off, in this case a small rubber or fabric strap wrench is best so as not to mar the finish. Once the cap is off, the spout will simply lift straight up exposing the brass post where the two O-rings sit. Good luck.
Posted on Aug 26, 2010
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Posted on Jan 02, 2017
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Take the cartridge out, Place a mug style cup over the open faucet. Now if your arms are long enough you can do it alone. If not have some one under the sink and open the valves both hot and cold.
You might have left junk inside from the old cartridge. Then place your hand on top to cover the hole where the cartridge was and see if water comes out of the spout,
If you done get water out remove the spout and clear ir and put it all back together again.
Be safe. Best of luck
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