Checking base of cluster for traces of milk fat Check for deposits under the mouthpiece and down the liner barrels, and for any split or worn-out liners. Inspect any stainless steel droppers for deposits. Stainless steel droppers should be bright and shiny inside. Inspect automatic cup remover bowls, milk meter bowls, and any other similar devices for deposits on the milk contact surfaces. If the end units are satisfactory, repeat checks on every second or third unit moving towards receival can.
Suction lines can be difficult to clean due to lower flow rates.
Look out for spongy pump diaphragms, perished pump hoses and milky plugs. Check the internal surfaces of milk filter housing for patches of mucous, milk fat or milkstone. Inspect the plate cooler for milk or water leaks. If milk filter socks have been bursting, check plate cooler for partial blockages. Inspect milk hose to bulk tank for condition and residues.