Toro 20330 Service Manual - Page 142

SELF-PROPEL BELT REPLACEMENT There are several different procedures for replacing the self propelled belt. Mowers with a blade clutch mechanism are the most complex as parts of that will need to be removed to access the self propel belt. Toro 21" Front Wheel Drive See Worm Drive Transmission page 1-1. These mowers usually have a model number that starts with 16xxx. Remove the belt cover, push the top of the transmission to the rear to create slack in the belt and remove the belt. Push the belt towards the engine. Drain fuel and oil to prevent spillage and tip the mower on its side, air filter side up. Slip the belt off the crankshaft pulley. In some cases there might not be enough clearance between the blade and mower housing. It might be necessary to remove the blade to slip the belt off. Reverse the process to assemble. 22" Front Wheel Drive See Single Speed Bevel Gear Transmission page 2-1. These mowers usually have a model number that starts with 200XX. Drain the fuel and oil before you tip the mower on its side. To remove the belt cover, tip the mower to access the two mounting screws from the bottom. There are belt guides on both the transmission and around the crankshaft. DO NOT bend them or force the belt out from under the guides. Loosen or remove the mounting screws to pivot the belt guides out of the way. If the belt guides are bent or out of place the belt will have a larger tendency to jump and may not disengage properly. It may be necessary to remove the blade to replace the belt. Do not force the new belt between the blade and mower housing. A nick or cut in the new belt can cause premature failure. 22" Rear Wheel Drive These are steel deck mowers, made in both Toro and Lawn-Boy brands. In order to replace the self propel drive belt the transmission must be removed from the chassis. This is necessary to access the pulley and belt guide on top of the transmission. See Single Speed Bevel Gear Transmission, Rear Wheel Drive Models, Transmission Removal and Belt Replacement, see page 3-10. Do not bend the belt guides or force the belt between the pulley and belt guide. Drain the gas and oil before tipping the mower to avoid fuel spillage. Remove or loosen the belt guide mounting screws and move the belt guide out of the way. A bent belt guide will cause an increased tendency for belt jumping and damage. 21" Steel and Cast Deck Toro and Lawn-Boy Mowers Belt Replacement Drain the gasoline and oil before tipping the mower to avoid fuel spillage. Remove the belt cover. Loosen or remove the belt guides so the belt can be replaced without forcing. See the Single Speed Spur/Bevel Gear Transmission section for a typical transmission and drive layout, see page 2-2. 21" Cast Deck Mowers with 3 Speed Transmission Made in both Toro and Lawn-Boy brands. To replace the belt, drain both the gasoline and oil from the engine. Remove the belt cover, just behind the engine on top of the mower, to access the transmission. Loosen or remove the belt guides so the belt can be replaced without forcing. See the section on the three speed transmission starting on page 4-1. 8-2 WPM Drive Systems Manual