Vintage Lego Technic Set 8851 Review...Also With Motorized Version! - YouTube
LEGO 8851 Excavator Set Parts Inventory and Instructions - LEGO Reference Guide
Technicopedia: 8851
Recently pieced together this old pneumatics set from 1984 from a used lot so I thought I would compare it to some of my more modern pneumatic sets : r/lego
REVIEW] 8851 Excavator and Pneumatic Upgrade Guide - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums