🧑🔧 Maintenance engineer
Also known as: mechanical engineer
Sets up pasteurizers, milking machines and filling lines; pasteurization is 161 °F (≈72 °C) for 15 s (21 CFR 131.3).
A maintenance engineer in the dairy industry is a specialist who sets up, maintains and repairs machines: milking machines, coolers, pasteurizers and filling lines. The international classification ISCO-08 distinguishes mechanical engineers (group 2144) and mechanics of industrial and agricultural equipment (group 7233). Without their work, modern milk would not reach the store.
According to BLS, industrial machinery mechanics take machines apart when a fault occurs, look for the cause, repair or replace parts and check the machine after repair. A high-school education is usually enough for them, but they train on the job for more than a year. Mechanical engineers design, develop and test mechanical and thermal devices and usually hold a bachelor’s degree. So one plant may employ both an engineer and a mechanic.
The pasteurizer is an example of equipment that is watched especially closely. The US definition (21 CFR 131.3) requires every particle of a dairy product to be heated and held at, for example, 161 °F (about 72 °C) for 15 seconds or 145 °F (about 63 °C) for 30 minutes. Plate heat exchangers are often used for low-viscosity products such as milk. After heating, the product passes through a holding tube, and a flow diversion valve sends underheated product back to the tank of raw material (Wikipedia).
Why it matters to you. The safety of the milk you buy depends on this equipment working properly: underheated product should not reach the bottle, so sensors and valves are checked regularly. And if you are choosing a career, note that in the US BLS projects employment of industrial machinery mechanics to rise by 14% over 2025–2035, while the median pay in 2025 was 64,100 dollars a year.
Facts
| Main use | Sets up, maintains and repairs machines: milking machines, pasteurizers, filling lines 2 3 |
|---|---|
| Registered | ISCO-08: 2144 “Mechanical Engineers” and 7233 “Agricultural and Industrial Machinery Mechanics and Repairers” 1 |
| Temperature | Pasteurization: 145 °F for 30 min or 161 °F for 15 s (≈63 °C and ≈72 °C) 4 |
| Duration | Mechanics: over a year of on-the-job training; engineers: bachelor’s degree (US) 2 3 |
| Region | US: 547,300 mechanics and 298,500 mechanical engineers (2025) 2 3 |
How it connects to milk
🧑🔧 Maintenance engineer → works with → ⚙️ Milking machine → for → 🧀 Raw milk → becomes → 🥛 Milk
Links
- Works with
- ⚙️ Milking machine, ⚙️ Pasteurizer, ⚙️ Filling line
- Who this is
- 🧑 Human
- Part of
- 🏭 Dairy plant jobs
Frequently asked questions
What does a mechanic at a dairy plant do?
Services and repairs equipment: pasteurizers, separators, filling lines, refrigeration units. According to BLS, mechanics take a machine apart when it breaks down, repair it and check it afterwards.
How does a mechanical engineer differ from a mechanic?
Under ISCO-08 these are different groups: mechanical engineers are 2144, equipment mechanics 7233. According to BLS, an engineer usually has a bachelor’s degree, while a mechanic needs a high-school education and more than a year of on-the-job training.
How does a pasteurizer make sure the milk has been heated?
After the heat exchanger the milk passes through a holding tube, and a flow diversion valve returns underheated product to the tank (Wikipedia). The regime is set by law, e.g. 161 °F (≈72 °C) for 15 s (21 CFR 131.3).
Is it true that pasteurization is boiling milk?
No. Under 21 CFR 131.3, for example, 161 °F (about 72 °C) for 15 seconds is enough, while boiling is about 100 °C.
How much do mechanics and engineers earn?
According to BLS (US, 2025), the median for industrial machinery mechanics is 64,100 dollars a year, and for mechanical engineers 104,110. Pay differs in other countries.
Similar
🧑🔬 Laboratory technician · 🧑🔬 Dairy technologist · 🧑🍳 Cheesemaker · 🧑🌾 Milker · 🚛 Milk tanker driver · 📋 Freight forwarder
Sources
- ILO. ISCO-08: структура й назви груп (групи 2144 і 7233)
- BLS. Occupational Outlook Handbook: Industrial Machinery Mechanics, Machinery Maintenance Workers, and Millwrights
- BLS. Occupational Outlook Handbook: Mechanical Engineers
- 21 CFR 131.3. Definitions (pasteurized; ultra-pasteurized)