S&S Cycle Pinion Shafts for Big Twin - Manual (Page 7)

If oil pump drive gear is installed with sharp edge
against radius on pinion shaft bearing boss, sharp edge
may nick radius. This can result in a stress riser that
may cause shaft to break. See Figure 10.
14. Install cam, breather gear, and gear cover according to
Harley-Davidson ® factory procedure.
NOTE: Gear cover should slide into place with little or no
resistance. If gear cover will not slide on easily, cause of
resistance must be determined and corrected. Under no
circumstances should cover be forced into place.
Forcing gear cover on may subject pinion shaft to
unwarranted side loading and flexing which during
operation can cause shaft to fatigue and break.
NOTES:
●
Oil pump drive gear spacer will not completely fill gap
between oil pump drive gear and pinion gear. A gap
of up to .125" may exist, and is normal. Function of
spacer is to prevent pinion shaft oil pump drive gear
from disengaging from oil pump drive shaft gear if
engine is turned backward. During normal operation,
oil pump drive gear is pulled toward pinion shaft
bearing boss.
● Be sure oil pump drive gear is installed with chamfered
side toward pinion shaft bearing boss. See Figure 10.
7
CAUTION
CAUTION
Chamfer toward pinion
shaft bearing boss
Sharp edge toward pinion
shaft bearing boss
Right
Wrong
Figure 10