- Undo the rotor cover mounting nut 1 with the filling neck and remove it.
- Remove rotor 3 and support it with nozzles down to let oil run out.
- Unscrew nut 2 on the rotor and separate both rotor parts from each other.
- Use a wooden scraper to remove all dirt deposited on the inner rotor walls and wash all parts using diesel oil properly.
- Make sure both rotor parts are reassembled in the position predetermined by the marks.
- Before fitting the rotor cover, test free rotor rotation by hand.
- Tighten the rotor cover fastening nut to avoid damage thereto.