Lego 8837 Pneumatic Excavator. Year: 1992. Really awesome to build this one! Got it fully working while missing one part. Used a long tube instead of 2 short ones (missing the long connector) - 9GAG
LEGO 8837: warum alte Technic-Sets so viel besser sind ?! [Review] - YouTube
LEGO Set 8837-1 Pneumatic Excavator (1992 Technic) | Rebrickable - Build with LEGO
Analysing and explaining Lego technic set 8837 - YouTube