Toro 20330 Service Manual - Page 68

THREE SPEED TRANSMISSION There are also three gears on the output shaft. These three gears rotate freely on the gear sleeve. The gear sleeve is coupled to the output shaft with a roll pin so the gear sleeve always rotates with the output shaft. The gear selection system determines which one of these three gears will be coupled with the gear sleeve and the output shaft. This determines the final drive ratio. Gear Selection System: Gear selection is determined by moving sliding shift keys in a sleeve that is fixed to the output shaft. These keys engage one of the three gears that rotate on the gear sleeve. Once the key engages one of the gears, that gear will rotate the output shaft. Table 1 shows approximate speeds in gears for two different engine speeds. Table 1 Gear Ground Speed @ 3000 RPM 1 1.8 mph (2.9km/h) 2 2.7 mph (4.4km/h) 3 3.8 mph (6.1km/h) Ground Speed @ 2000 RPM 1.2 mph (1.9km/h) 1.8 mph (2.9km/h) 2.5 mph (4.3km/h) The shift keys are retained on one end by the shift collar. Movement of the shift fork positions the shift collar and shift key. The shift fork is supported, both top and bottom, by nylon bushings for smooth operation and long wear (Fig. 117). A B C A. Gear Sleeve B. Shift Collar Fig 117 C. Keys 3428-0065 The operator controls movement of the shift fork by means of the gear selection control and cable. Note: There are no shift detents in or on the transmission on 1988 and newer mowers. 4-4 WPM Drive Systems Manual