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Hydraulic oil and hydraulic fluid are different. Hydraulic fluid is used in small systems such as car brakes. Hydraulic oil is used in large systems such as loaders.
Hydraulic fluid is hydraulic oil.... as for the type you use, depends on your system. I used to own two tractor-trailer end dumps, and I actually used ATF rather than hydraulic oil. Check with the OEM for your hydraulic system before you do this, though.
In some cases, yes but NOT for hydraulic BRAKE fluid.
Automatic Transmission Fluid Type "F"
The most commonly used hydraulic fluids are oils, so yes they are flammable. However, most any fluid COULD be used as a hydraulic fluid depending on the system design requirements. So it really depends on exactly what type of fluid is being used whether it is flammable or not. Water is a "hydraulic fluid" and is not flammable. Under NFPA standards, petroleum-based hydraulic fluids are not "flammable" if their flash point is above 100o F (37.8o C); they would be "combustible". NFPA 1 (2009): 3.3.153.2 Definition of Flammable Liquid
Hydraulic oil.
There are many different specification and types of Hydraulic fluid. A specific power steering fluid for one car model may not work for all cars. So be careful when you substitute different fluids. Hydraulic fluid used in aircraft is different from that used in cars. The fluid used in shock struts and landing gears are different. Swapping fluid can cause the seals to weaken and result in leaks. The term "hydraulic fluid" can be a generic word for any fluid used to power a mechanic device.
MIL-H-5606...............this is the basic fluid used in the aircrafts........more information in google ...just type in hydraullic fluids in aeroplanes
The most common fluid used in those specific mowers are Dextron III. If you still have the manual, it will also tell you.
Normally DOT3 brake fluid. Check you owner's manual or look on the reservoir cap.