Bleeding (removing air) from the power steering hydraulic system is necessary after any work that depressurizes the system (replacing the pump or lines).
A sign of air in the system is the steering wheel sticking when attempting to turn it sharply. In addition, when the steering wheel is turned, the pump makes increased noise, and the fluid in the reservoir usually foams.
Fill the power steering system with working fluid (see "Adding Power Steering Fluid to a Renault Logan") up to the "MAX" mark.
Turn the steering wheel all the way to one side, then to the other.
Start the engine.
Turn the steering wheel all the way to one side.
Do not hold the steering wheel in the extreme position for more than 10 seconds. seconds.
Turn the steering wheel all the way in the opposite direction.
Turn the steering wheel to the center position and stop the engine.
Check the power steering fluid level in the reservoir and top up if necessary.
When the engine is warm, the power steering fluid level in the reservoir should be no higher than the "MAX" mark; when the engine is cold, no lower than the "MIN" mark.
Repeat steps 4-7 until the oil level in the reservoir stops dropping.