Mk3 bosch ESP torque sleeve

[Disasta]

Hi guys,
I have an ford transit 12/1988 with low power at hills..
Engine 70ps 2,5 di

I changed the fuel filter an the pencil injectors ( original stanadyne orange mark)
Now i want to check the torque sleeve but i do t know how to open the bosch pump:
2 screwes are open, but what kind of screw are the other ones on the picture

[img][IMG]https://s20.directupload.net/images/210627/3qfe3ow4.jpg[/img][/img]