Toro Owners Manual - Enlarge page 1 
From inside (document excerpt):
Greensmaster Flex 18 & 21 Specifications* ® GREENSMASTER FLEX 18, MODEL 04019 ENGINE FUEL CAPACITY GEARBOx DRIVE MAINTENANCE GROUND SPEED TRACTION DRUM CONTROLS HANDLE TRANSPORT TIRES/ KICKSTAND REEL CONSTRUCTION SUSPENSION WIDTH OF CUT HEIGHT OF CUT CLIP FREqUENCY CUTTING UNIT CONST. CUTTING UNIT ADjUST./SERVICE BEDKNIFE GRASS BASKET ROLLERS WORKING WEIGHT WARRANTY ® GREENSMASTER FLEX 21*, MODEL 04024 Kawasaki , 4-cycle, 3 7 hp (2 7 kW), air-cooled OHV engine, 3600 rpm Displacement: 7 57 cu in (124 cc) Cast iron cylinder sleeve Electronic ignition Maximum noise suppression muffler 83 dB(A) at operator’s ear 2 64 quarts (2 5 liters) regular grade unleaded gasoline Traction: Integral gearbox assembly directly mounted to the engine The traction drive consists of a constant mesh planetary gear reduction incorporating a wet bath band-type clutch and brake driving a Peerless differential assembly integrated into the gearbox assembly Positive drive belt to traction drum Implement. Grooming Brush Groomer Quick Up Kit BEDKNIFE & BEDBAR OPTIONS BEDKNIFE & BEDBAR OPTIONS SCRAPER OPTIONS Narrow Wiehle Roller Scraper Wide Wiehle Roller Scraper Full Roller Scraper Rear Roller Scraper Narrow Wiehle Roller Scraper Brush Wide Wiehle Roller Scraper Brush Full Roller