Replacement of the entire steering system or replacement of the steering gear do the following:

Check hydraulic oil level and top off if necessary.
Raise vehicle until front wheels are free.
Start engine briefly (max. 2 seconds)
The pump must not draw in any air, the steering wheel must not moved under any circumstances.

Waiting time between individual engine starts approx. 30 sec.
Check hydraulic oil level and top off if necessary.
Repeat procedure until the oil level remains constant.
Turn steering wheel from lock to lock 10 times, with engine switched off.
Check hydraulic oil level and top off if necessary.
Start engine.
Turn steering wheel from lock to lock 10 times.
Check hydraulic oil level and top off if necessary.
Any remaining air in the steering system will dissipate when driving over the next 10-20 km (6-12 miles).