Toro 20330 Service Manual - Page 101

BBC / BOS / BCS Under Deck Components Disassembly (Toro Vacu Power/Lawn-Boy Medallion) 1. Stop the engine and disconnect the spark plug lead to prevent accidental starting. Drain fuel. 2. Remove the 2 flanged nylon locknuts securing the blade to the bearing block and remove the anti-scalp cup, the blade, the blade spacer, and the lower BBC screen (Fig. 169). 5. If further disassembly is required, begin by removing the crankshaft nut. An impact wrench works best. However, if you must remove it manually, use a large screwdriver or bar to wedge the BBC flywheel while removing the nut (Fig. 170). Note: Be careful not to damage the bearing seal when removing this nut, or premature bearing failure could result. Fig 169 3428-0099 Fig 170 MVC-724 3. Remove the 4 flanged head self-tapping screws securing the lower BBC cover to the housing, and remove the lower BBC cover. 4. Before disassembling further, check to make sure that the BBC components are functioning normally. Make sure that the brake and brake drum fully disengage when the control bar is cocked, then raised. Make sure that the BBC flywheel and the brake drum rotate together when the control bar is raised. Make sure that the belt loosens properly when the control bar is lowered. Repair or replace parts as required. 6. Pivot the brake plate counterclockwise slightly and remove the bearing block and brake drum from the crankshaft (Fig. 171). WPM Drive Systems Manual Fig 171 MVC-726 6-15