This is an original parts catalog which shows exploded views of parts and groups of parts as well as part numbers and part descriptions for your machine. It also gives you information on operating your equipment. Lots of illustrations, and instructions to help familiarize you with the White 54 Inch Snow Blade for Yard Boss GT-1120 (990-138), GT-1622 (990-137), and GT-1355 (990-189) (only the snow blade is covered in this manual).