Hydraulic Fluids
What is the primary function of Hydraulic fluid?
To Transmit Power
What is the term for a fluid's lowest flowing temperature?
Pour Point.
How should barrels be stored to avoid contamination?
On their sides or tilted.
What is a common sign of contamination in hydraulic systems?
Sticky valves or wear.
What does SAE stand for in viscosity grades?
Society of Automotive Engineers.
Which property measures resistance to flow?
Viscosity
What is SUS viscosity measured with?
A Saybolt viscometer.
What tool ensures barrel bungs are tight?
A wooden mallet.
How often should fluids be checked?
As recommended in the service manual.
Which fluid has the highest leakage risk?
HFA fluids.
Name one type of fire-resistant hydraulic fluid.
HFD, HFA, or HFC fluid.
How does oxidation affect hydraulic fluids?
It causes acids, sludge, and varnish.
Why store barrels indoors in winter?
To prevent water contamination from freezing.
What is one purpose of baffles in reservoirs?
To cool the fluid by dissipating heat.
What happens with excessive foaming in fluids?
Reduced lubrication efficiency.
What additive prevents rust in hydraulic fluids?
Rust inhibitors.
What is the main risk of low-viscosity fluid?
Increased internal leakage.
What practice prevents water around barrel bungs?
Storing barrels under cover or indoors.
Why use only recommended fluids?
To ensure compatibility and system longevity.
What type of additives prevent sludge?
Antioxidants.
What does a high Viscosity Index (VI) indicate?
Less change in viscosity with temperature.
What does demulsibility in fluids refer to?
The ability to separate water.
What happens if water enters hydraulic fluid?
It accelerates wear and causes sticking valves.
What does a clogged filter indicate?
Potential contamination or wear.
Name one factor affecting fluid selection.
Type of crude oil or refining method.