Preventing Main Gear Bearing Failure
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| High and moderate
horsepower applications generate substantial lateral
movement of the inner drawn cup bearing, which
can eventually work its way out of the main drive
gear bore, resulting in catasrophic transmission
failure. |
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A
close look at the little details
that make a big difference in reliability
and capacity.
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Our
exclusive caged roller bearing is
securely retained in the bore by
snap rings over washers at both
ends. Only Johnson Engineering provides
performance details like this.
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New
SportGear cross section below. Washers
between snap rings and bearing shell
allow bearing to float freely without
axial movement for even longer life.
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Snap
ring retainers on both ends put
an end to bearing "walk"
and possibility of failure. Details
like this keep your tranny alive
and well.
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Our bearing can't shift
laterally thanks to retainer snap
rings over washers. Big and beefy
design ends radial crushing.
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Caged roller on left, drawn
cup needle bearing on right illustrate
major differences in load capacity
where it counts.
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| Johnson
Engineering's helical main (output) gears replace
the inexpensive driven end drawn cup bearing (not
shown) with a high performance caged roller (top
left) that's capable of much higher load and torque
than OE or aftermarket bearings. |
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| We've also added snap
rings (top, middle drawing) over washers on both
sides of our roller bearing, as well as on the sprocket
end needle bearing, to eliminate lateral movement
in either direction. |
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Bearing Size
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| Premature
bearing failure can also occur when the bearing
dings the sheet metal drawn cup that retains the
OE needle bearings. The small diameter of the
needle bearings, coupled with the relatively soft
drawn cup sheet metal, allows the drawn cup to
become dimpled under heavy loads. And nobody thinks
dimples are cute when bearings are the issue. |
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| Our massive caged
roller bearing features 3.5 mm diameter heavy duty
rollers, over 30% larger and with three times the
load capacity of standard 2.5 mm diameter needles.
They won't crush down under heavy use, and can't
walk because of our exclusive snap ring retainers. |
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| The
entire main gear assembly results in a much stronger
gear set. Notice the snap rings on both ends of
our stout caged roller bearing on the driven end.
Our new SportGear (shown) main gear oil seal is
retained by another exclusive, our drive end snap
ring that stops unwanted oil leaks that start
with a wobbly, unsecured oil seal. |
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SportGear™ and TwistGear® are
trademarks of Johnson Engineering,
Inc. Buell™, Dyna™, and Sportster™
are trademarks of the
Harley-Davidson Motor Company. No affiliation
with the
Harley-Davidson Motor Company is implied or
inferred.
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