1+ Front pump  
2+ Pump seal  
3+ Cylindrical pin  
4+ O-ring  
5+ Intermediate plate  
6+ Screw plug  
7+ Sealing ring  
8+ Screw plug  
9+ Sealing ring  
10+ Hexagon head screw  
11+ Special washer  

The part numbers in the assembly image below relate to the product number in the table. Clicking on the part number will open up the relevant part details.