How would you release the hydraulic oil pressure before disconnecting the supply piping from the tractor’s attachment or additional equipment?
- There are specific drainage taps for this purpose. They should be opened for a few seconds.
- Correct answer: Move the operation lever in all directions when the engine is off.
- Turn off the engine, wait a few minutes and only then disconnect the piping.
- Connect the pressure discharge passage between the supply line and the return line.
Why this is the answer
The correct answer in the official bank: Move the operation lever in all directions when the engine is off.
Even with the engine off and the hydraulic pump stopped, pressure stays trapped in the hoses and cylinders. Moving the operation lever in all directions opens the control valves and lets this pressure escape, so the piping can be disconnected safely. Simply waiting a few minutes does not release the pressure, and oil spraying out under high pressure can cause serious injury.