Volvo Penta workshop manual group ???

[Orthop]

Hi all. I want to make a download of the workshop manual D4/D6 at VP Website. Thera are two different (?) manuals. One is dedicated as group 30, the other one as group 21-26. The workshop manual is about 50 €. Can someone explain me the difference between group 30 and group 21-26?

 

[scottie]

i think that there is more than 2 parts to the manual
cooling system
electrical
crankcase
lubrication
plus another one that escapes me at this time