Paul Mueller Company Academy

Milk Cooler Preventative Maintenance


Farmers and Producers know - good milk quality depends on the correct cooling and system cleanliness.

As the milk cooling experts, Paul Mueller Company recommends our equipment owners, in conjunction with a knowledgeable service technician, develop a preventative maintenance schedule before using the equipment. That plan should encompass proper cleaning and inspection schedules for all milk cooler components to keep operation optimal. The frequency of inspections will vary depending on the environmental conditions surrounding the installation and may be unique to each dairy. Here are some general guidelines to help you formulate that schedule and keep your milk cooling equipment running excellently for decades to come: 

Dairy farm service team working on tank

Preventative Maintenance Guidelines

30-Day Intervals

  • Evaluate, repair and/or replace parts as needed1 
  • Confirm 115°F (46°C) minimum water temperature during detergent wash cycle at detergent drain
  • Confirm 170°F (77°C) maximum wash water temperature at inlet2 
  • Confirm correct pH of chemicals and PPM of chlorine
  • Inspect ladder for damage or wear
  • Check milk temperature display accuracy


60-Day Intervals

  • Evaluate, repair and/or replace parts as needed1 
  • Confirm correct operation of condenser fan on air cooled refrigeration units, and identify irregular noise which could indicate motor or fan blade failure
  • Inspect condenser coils on air cooled refrigeration units for excessive dirt accumulation and clean the condenser coils with approved copper/aluminum coil cleaner as required
  • Visually inspect the internal walls of milk cooler and other product contact surfaces for protein, fat, or mineral deposits. If surfaces are not clean, consult a knowledgeable service technician for necessary adjustments to the cleaning cycle, water supply, or chemicals used


90-Day Intervals

  • Evaluate, repair and/or replace parts as needed1
  • Inspect rubber and rubber-like components (such as manway gasket and outlet valve gaskets) for cracking, tearing, discoloration, loss of elasticity, or inking. Replace as needed
  • Check agitator drives for noise, leakage, and correct clockwise rotation
  • Check agitator mounting hardware ensuring all bolts are tight and secure
  • Check water solenoid fill screens for contamination or restriction



  • Evaluate, repair and/or replace parts as needed1 
  • Perform refrigeration system cooling performance survey1 
  • Perform wash system performance survey1


Paul Mueller Company is dedicated to protecting your product and your bottom line. With the help of authorized Mueller parts and specialists, you can keep your operations running strong today and for generations to come.  Find your closest Mueller Dairy Farm Dealer.


1 All inspection, repair, and service of electrical and refrigeration components should be performed by a Mueller Authorized Dairy Farm Equipment Dealer using Paul Mueller Company trained and certified service technicians.
2 Any equipment problem which could result from exceeding this limit will be considered outside the scope of the Mueller warranty and the sole reasonability of the owner.


Topics: Milk Coolers, Maintenance

About Paul Mueller Company Academy

Teaching and sharing ideas has long been part of the rich heritage at Paul Mueller Company. We have almost a century of quality craftsmanship guiding the way we apply new learnings. Paul Mueller Company Academy is a collection point for those learnings, so we can collaborate and grow more successful together. You will find articles, blogs, guides, infographics and more dedicated to furthering knowledge for all, in the world of stainless steel processing equipment solutions. We hope you enjoy!