We normally add ATF fluid half hyraulic, half ATF. Seems to work great.
Pressure by the hydraulic pump is made​​.
Under normal conditions no because the hydraulic fluid is usually oil based. In conditions that are not normal like space or lab conditions that are beyond normal temperature yes there could be a chance, but very unlikely.
The "Pour Point" of engine oil is about -44ºF.
The cross reference for m-4864 which is a hydraulic oil or transmission fluid is SAE 80 for below freezing temperatures. B (SAE 90) is used for temperatures that are above freezing.
The function of hydraulic lines is to connect to the hydraulic system to carry either water, oil or any other form of liquid for that system. The hydraulic line is extremely important to the function of the system and works based on either a low or high pressure.
To replace the steel hydraulic lines on a Bobcat 440B, first, ensure the machine is off and the hydraulic system is depressurized. Use wrenches to disconnect the old lines from the hydraulic components, taking care to note their routing and connections. Install the new lines by securing them at the same points, ensuring they are properly aligned and free from kinks. Finally, refill the hydraulic fluid if necessary, and check for leaks by testing the system before returning the machine to service.
galvanised pipe
Air in the lines
Good Question . Next please.....
galvanised pipe
Hydraulic is used in terms to define liquid. Hydraulic mining in the ole days was used by high pressure water. Hydraulic lines contain oil for cranes, booms, etc.
To keep the hydraulic fluid in (double acting cylinders) and to keep dirt/washwater/etc out.