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Pilot bearings serve as a guide for the transmission input shaft. When the flywheel and
pressure plate assembly turn at speeds different than the input shaft and disc assembly, the pilot bearing
rotates.
Even though pilot bearings/bushings are only a small portion of the total cost of a typical clutch
replacement, a new pilot should be included with each clutch replacement. Problems caused by a worn or damaged pilot such as excessive
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noise, misalignment, and imbalance are not
worth the labor cost to remove and replace the bell housing and transmission. What’s more, these
problems may eventually cause considerable damage that would require a complete clutch system replacement.
AMS offers the industry’s most comprehensive pilot bearing coverage for medium and heavy-duty
vehicles. Each bearing meets or exceeds OEM requirements, including the newest industry standards
for high temperature shields and grease.
As recommended by truck manufacturers, all AMS bearings utilize the C3 clearance specification
(measures between the rolling elements and raceway), providing optimal expansion due to heat/improper
alignment, thus ensuring improved durability and performance. In order to properly match the bearing
to the vehicle’s driveline components and operating conditions, AMS offers Nitrile sealed, Viton®
sealed or steel shielded.
Nitrile and Viton® “rubber” sealed bearings provide excellent resistance to petroleum products and
external contamination. As a lower cost alternative, Nitrile has been the industry’s most widely used
elastomer seal, whereas Viton® offers improved resistance to the increased temperatures generated by
today’s high torque engines.
Steel shielded bearings offer a less expensive alternative. They differ from sealed bearings in that
their primary purpose is to shield the bearing interior, offering less sealing efficiency. However,
because the steel shields aren’t designed as seals, they create less friction and lower operating
temperatures.
Type |
Seal/Shield Description |
Grease Retention |
Dust Proofing |
Water Proofing |
Resistance To Temp. |
Friction Torque |
2RS |
Nitrile Seals |
High |
High |
Medium |
Medium |
Medium |
2RSV |
Viton® Seals |
High |
High |
Medium |
High |
Medium |
ZZ |
Steel Shields |
Medium |
Medium |
Low |
High |
Low |
ZZ-S |
*Steel Shields |
Medium |
Medium |
Low |
High |
Low |
* Two steel shields with a snap ring (fits Mack engines only) |
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| Type 2RS |
Type 2RSV |
Type ZZ |
Type ZZ-S |
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Back To Top |
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December 15, 2009 |
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Phil Marchbank named 2009 Manufacturers' Rep of the Year
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December 03, 2009 |
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New Era Marketing Inc. named Manufacturers' Agency Of The Year
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December 22, 2008 |
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AMS Automotive Develops On-Line Video Technical Bulletins
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December 17, 2008 |
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Metro Reps named 2008 Manufacturers’ Agency Of The Year
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