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The paper will review existing seals used in off-highway heavy equipment, both radial lip seal applications and face type seal applications in general use on track vehicles. With the trend towards improved reliability and durability, together with the never ending quest for quality and product improvements, the paper will discuss a number of seal development programs which will result in products that meet the new and projected future requirements for seals from the off-highway heavy equipment manufacturers.

A unique bonded polytetrafluoroethylene (PTFE) wafer radial lip seal has been developed for sparsely lubricated diesel engine crankshaft applications. The paper compares the design and performance of the bonded PTFE wafer design to an assembled PTFE wafer, laminated PTFE, and conventional fluoroelastomer seal designs. The PTFE wafer seal substantially extends seal life beyond fluoroelastomeric seals because of the lower temperature present at the sealing interface.