TM-9-2330-335-14-P
SEMITRAILER, TACTICAL, BREAKBULK/CONTAINER TRANSPORTER, 22-1/2 TON, RESET M871R, M871A1R AND M871A2R
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE MANUAL (INCLUDES REPAIR PARTS AND SPECIAL TOOLS LIST)
SEPTEMBER 2008
TM-9-2330-335-14-P - Page 585 of 640
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TM 9-2330-335-14&P
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FIELD AND SUSTAINMENT MAINTENANCE
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SKF SCOTSEAL
PURPOSE
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1.
The purpose of this work package is to help you reduce premature wheel end failures by tracking down their
causes. A SKF wheel end system is made up of high quality parts designed for reliability and long life. When a
part doesn’t reach its intended service life, it suffers premature failure, and this calls for an investigation.
2.
Tracking wheel end failure requires a planned, consistent approach to repair and maintenance, like the sample procedures
shown here. Investigating damage to a SKF Scotseal or Scotseal Plus wheel seal requires taking the seal apart. In these
unitized designs, the seal and sealing surface are inside, making it easy, once the surface is exposed, to track what
has happened.
3.
Reading the failure modes of bearings and hub caps is simply matching up the visible damage to a short list of causes. If
questions arise that aren’t covered here, contact your SKF sales representative. We’ll be glad to provide further help.
4.
For proper installation instructions on Scotseal, Scotseal Plus, bearings, and accessories, the following materials are
available: Fleet Self Study Guide (457935) and Bearing Self Study Guide (457640).
PROCEDURE
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Inspect for Indications of Leakage
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1.
Under vehicle inspection.
a.
Grease present past the seal.
b.
Grease contaminated hub, brake hardware, and brake shoes.
2.
External leakage
a.
Grease present around hub cap exterior.
b.
Grease present on wheels and exterior axle areas by dust shields.
Disassembling the Wheel End
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WARNING
Block wheels. Support vehicle on stands. Failure to do so could cause injury or death to personnel
and damage to equipment.
1.
Check condition of hub cap. Check flange.
2.
Check bolts and hub flange area on drive axle.
Remove Hub Cap
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1.
Check condition of lubricant.
a.
Cloudy or milky indicates water.
b.
Shiny indicates bearing wear.
c.
Gritty or sandy indicates contamination.
d.
Burnt smell indicates overheating.
4
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