The bearing in the pump is not good and should be replaced. How to proceed to disassemble the pump ?

Remove the pin (17) and tap the axle (upwards) with a hammer.

The seal mounted in the middle of the spring seems to be difficult to get hold of. It’s worn and need to be replaced. Can’t see it as a part in the drawing. Perhaps it’s included in part 6 ? Not sure if that part is available either. If not I have to buy a complete new pump, quite expensive but still able to get. The new bearing I bought will  be a waste of money if I have to buy a new pump….(a new lesson learned. )

Does anyone know where to buy the seal ?