How does hydraulic landing gears work?
With check valves,selector valves,actuators,restricter valves
and sequence valve,the most common hydraulic fluid is called
skydrol,the fluid starts and the reservoir (tank) then it pass
throw the EDP or the GDP (engine driven pump note:for flight use
only) (generator driven pump note:for ground use only)and creates a
flow which os converted into pressure,PSI (pressure per square
inch)it reaches 3000 PSI and that force makes the landing gear go
up and down