Hydraulic cylinder systems are made to handle demanding work conditions and harsh environments. But even the most rugged, high-performing equipment can fail under certain conditions. In work environments involving high and low temperatures, the hydraulic cylinders and components of these powerful systems are especially prone to damage.
Whether you operate industrial or mobile hydraulic equipment, these tips will help you understand the effects of high and low temperatures on hydraulic systems and how to protect them from damage.
Protecting Hydraulic Cylinders in Extreme Heat
All hydraulic systems generate heat during operation. Extremely high temperatures, however, whether it’s from mechanical or environmental sources, heat can do a number on your hydraulic system.
High Temperatures and Hydraulic Fluid Viscosity
You know how oil thins out once you add it to a hot pan? Well, heat has that same effect on hydraulic fluid and lubricants. In fact, heat is considered a type of hydraulic cylinder fluid contamination because it changes the chemical properties, resulting in lower fluid viscosity and oxidation. These changes both affect how well fluid lubricates hydraulic cylinder components. Inadequate lubrication increases friction, making your hydraulic cylinders and components more prone to damage and wear.
Changes to Hydraulic Cylinder Seals and Hoses in High Temperatures
Extremely high temperatures can alter material properties, causing seals and hoses to lose resistance to tearing, abrasion, or friction. Compromised seals can introduce moisture, grime, and air into your hydraulic fluid and cause system failure. Construction and other applications involving prolonged exposure to extreme heat should consider Viton™, PTFE, or other materials with high temperature ratings.
Protecting Hydraulic Cylinders in Extreme Cold
Low Temperatures and Hydraulic Fluid Viscosity
Hydraulic fluid has a freezing point of -10°F (-23°C), but even temperatures above that can change fluid viscosity. Cold temperatures cause fluid to thicken, making it more difficult for the fluid to move through your hydraulic system. Lubricants are also temperature-sensitive and can harden or lose lubricity in extreme cold.
Using hydraulic fluid with a lower viscosity grade can help prevent custom hydraulic cylinder failure in extreme cold. Another way to maintain fluid viscosity in low temperatures is using an externally mounted heat source. You can find several types of heating elements on the market designed to keep the hydraulic fluid at the right temperature and viscosity.