Toro 20330 - Low Wheel Walk Power Mower Service Manual page 112

BBC / BOS / BCS
They are noise dampeners. Without them, when the
brake pad hits the drum, the drum will ring like a bell.
Also look at the two blade mounting bolts. Each has
a fl at side on the head to prevent them from rotating
when the nut is tightened (Fig. 196). Make sure the
bolts are fully seated. Install the brake drum.
4. Inspect the hub assembly if the old one is to be
reused. Rust on the outside is harmless. But the
seals in the bearing need to be intact. If the seals
are damaged or the bearing feels rough when it is
turned, replace the hub assembly.
5. Start the nut on the crankshaft. As during
disassembly, an impact wrench works best.
6-26
Fig 196 3428-0189
CAUTION! The two bumps on the pulley MUST
engage the fl ywheel. If you do not have an
impact wrench, this is where the two bumps
become important. If you engage the bumps on
the pulley into the fl ywheel, you can now wedge
the fl ywheel and through the pulley and key, it
will hold the crankshaft from rotating while you
tighten the nut (Fig. 197).
6. Slip the BBC belt over the parts on the crankshaft.
7. Check the shaft of the idler/brake arm. Clean as
necessary and apply a light coat of grease.
Fig 197 3428-0187
WPM Drive Systems Manual