Hayward Automatic Pool Cleaner, Gear Box Assembly. (Fits Pool Vac & Navigator Pool Cleaners). Usually this gear box needs to be replaced if your cleaners is going in one direction and the hose is tangling like a pretzel. Sometimes it becomes clogged with debris such as dog hair and just needs to be taken apart and cleaned. Make sure that your current gear box has a red top plate. If yours has a black top plate, its not interchangeable with this one, check the related products below for the black version.