Service Manual

8-18
WPM Drive Systems Manual
BBC/BOS/BCS
7. Press the bearings into the bearing block, using an
arbor press. Press only on the outer race, otherwise
bearing damage will result (use an appropriately
sized arbor or a 1-1/8” (28mm) socket to press the
bearing into the block).
8. Make sure that the foam rubber anti-vibration pads
are in place on the brake drum and assemble the
brake drum bearing block and BBC screws onto the
crankshaft as shown in Figure 210. Secure with the
crankshaft nut.
Note: Crankshaftnuttorque:45-70ft-lbs.(61-
 95Nm)
CAUTION! Aswithdisassembly,theywheel
canbewedgedtotightenthenut.Makesurethe
bumpsintheself-propelpulleystayengaged
withtheywheelorthepulleywillbedamaged.
Note: Makesurethatthebladeboltsareproperly
alignedbeforetighteningthecrankshaftnut.
9. Install the BBC cover with the four anged head self-
tapping screws.
10. Install the BBC screen, the blade spacer, the blade,
and the anti-scalp cup onto the BBC screw and
secure with the two anged nylon locknuts. Torque
to 300 in-lbs. (37 Nm).
Note: Bladelocknuttorque:300in-lbs.(37Nm)
11. Complete BBC service by checking BBC and self-
propel controls, making sure that all are functioning
normally. Adjust as necessary.
6. Install the BBC ywheel onto the crankshaft, making
certain that the slots in the BBC ywheel align with
the bumps on the bottom of the self-propel pulley
(Fig. 208).
Fig208 3428-0117
Fig210 MVC-726
A. Bumps B. Slots
A
B
Note: Ifthecrankshaftnutistightenedwiththese
bumpsmisaligned,thebossatthebottomof
thekeywayontheself-propelpulleywillbreak
andtheself-propelpulleywillbefreetoslide
upanddownonthecrankshaft(Fig.209).
Thiscanresultinnoisyoperation,premature
beltwear,andbeltjumping.
Fig209 3428-0116
A. Boss
A