Power Take Off (PTO) Shaft : The means by which the power of the tractor is used to drive trailed or mounted rotating equipment (hay baler, rotary hoe, mower, forage harvester, spray pump, etc)
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}