Why is my hydraulic fluid getting hot?
Hydraulic fluid is designed to operate at a specific temperature range. As it heats, it becomes thinner and eventually it will lose the ability to lubricate moving parts. The increased friction may cause the pump to heat up, and naturally increased wear will be taking place when this is happening.
Does hydraulic fluid expand with heat?
The volume of a specific hydraulic oil not only changes due to pressure changes, but also due to changes in temperature. When the temperature increases, the density of the oil decreases, leading to an increase in volume. This degree of expansion is expressed as the coefficient of thermal expansion (α).
How do you remove air from hydraulic lines?
For dissolved air, you can remove it by raising the temperature of the fluid until the air is released. This should only be done if absolutely necessary as hydraulic oil will normally tend to be at least 10% dissolved air.
What is the relationship between hydraulic fluid viscosity and temperature?
Cold temperatures will affect the viscosity of the fluids in your hydraulic system, which means not just the hydraulic fluid but lubricants. Low temperatures will increase the viscosity of hydraulic fluid and oil, which means that it will behave as a thicker fluid.
What happens when hydraulic fluid is too hot?
Hydraulic fluid temperatures above 82°C (180°F) damage most seal compounds and accelerate degradation of the oil.
What should I do if my hydraulic system is overheating?
Beat the Heat. There are two ways to solve overheating problems in hydraulic systems: decrease heat load or increase heat dissipation. Hydraulic systems dissipate heat through the reservoir. Therefore, check the reservoir fluid level and if low, fill to the correct level.
What should the temperature of a hydraulic system be?
This can occur well below 180°F, depending on the fluid’s viscosity grade. To achieve stable fluid temperature, a hydraulic system’s capacity to dissipate heat must exceed its heat load.
How does a hydraulic system dissipate heat?
Hydraulic systems dissipate heat, albeit a relatively small amount, through the reservoir. Therefore, check the reservoir fluid level and, if low, fill to the correct level. Check that there are no obstructions to airflow around the reservoir, such as a build-up of dirt or debris.