LEGO Technic Excavator (8851) original instructions manual | eBay
Everything You Want To Know About LEGO Pneumatics - BrickNerd - All things LEGO and the LEGO fan community
LEGO Excavator Set 8851 | Brick Owl - LEGO Marketplace
Lego Technic 8851 Excavator
LEGO 8851 Excavator Set Parts Inventory and Instructions - LEGO Reference Guide
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