Service Manual

8-15
WPM Drive Systems Manual
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 anged 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. 202).
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 ywheel while
removing the nut (Fig. 203).
Note: Becarefulnottodamagethebearingseal
whenremovingthisnut,orprematurebearing
failurecouldresult.
3. Remove the 4 anged 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 ywheel 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.
Fig202 3428-0099
6. Pivot the brake plate counterclockwise slightly and
remove the bearing block and brake drum from the
crankshaft (Fig. 204).
Fig204 MVC-726
Fig203 MVC-724