I have recently re-built the gear assembly and repaired leak into bowl.
1) remove plastic covers top and bottom.top three screws on plate.Two small screws on lower section.
2) remove plastic handle on lever to front attachments.
3) should now see assembly.
4) unscrew two bolts at end of assembly.
5)split casing carefully and remove all the old grease.
6) fit if required new Rubber Seal (stock No 5031.6893-8339-4) on main spindle.
7)Re-assemble gear train a grease main gears only not too much with grease for food appliances( amazon)
JOB DONE
tommy
December 2011