This technical manual (tm-1288) is a service guide for your John Deere Walk-Behind Rotary Mowers (18", 20" - S/N: 250001- )(21" - S/N: 250001-360000). Dated Apr-86. Included in the manual are specifications, and instructions for repair, tune up, removal of parts, etc.  The manual has some water damage top side of manual.  It is still legible and good to use.