I had to replace the injector pump ($$$ouch$$$) on my B9200 . Four cylinder 1200 Kubota Diesel.
I removed the side cover 1st. Their was two springs that I had to carefully remove from the pump before I could pull it out.
I would suggest that you take a digital image of the parts before you remove anything, to aid in re-assembly.
No, parts shouldn't go flying everywhere. Just be carefull, take your time, and remove those springs with a pair of needle nose pliers.