How much does a gallon of hydraulic oil weigh?

Hydraulic fluid weights 7.2 pounds per gallon. Water, which weighs 8.2 pounds per gallon, is slightly less dense. Mineral oil is used in most hydraulic fluids.

Good hydraulic fluids are viscous enough to prevent leakage via seals, but not so viscous that the pump struggles to move through the system. They must be thermally stable, meaning they can operate in a wide range of temperatures without breaking down, while still providing appropriate lubrication to reduce wear. Foam inhibitors are added by manufacturers to lower the fluid’s surface tension, allowing air bubbles to break apart without forming foam. Foam increases wear while reducing the fluid’s ability to provide lubrication.

Read more: How Long Does the Scattergories Timer Last?

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