Service Manual

8-24

WPM Drive Systems Manual

BBC/BOS/BCS

8. Roll the self-propel belt off the pulley and remove the

pulley and the key in the crankshaft.

9. Inspect the pulley. One end of the keyway is

blocked off. If that is broken, the pulley will bounce

up and down during use and make a rattling noise

(Fig. 225). There are two bumps on the outside

of the pulley that are intended to engage two

holes in the ywheel. If this wall is broken out or

the bumps on the pulley are damaged, the pulley

must be replaced. Usually this is caused by an

error in assembly. Refer to “Idler Arm System

Assembly (Recycler/Rear Bagger)” on page 6-25 for

instructions to avoid this.

6. Now, disassemble the components on the crank-

shaft. If you have an impact wrench, the large nut on

the crankshaft can be spun off. If you must remove it

manually, wedge a bar or large screwdriver into the

BBC ywheel (Fig. 223). This will hold the crankshaft

so the nut can be removed.

Fig223 3428-0187

7. Remove the hub assembly and brake drum. The

ywheel is pressed onto a taper on the crankshaft.

It might require a tap with a hammer to loosen (Fig.

224).

Fig224 3428-0103

Fig225 3428-0116

A. Wall B. Bumps