Industrial seal self study guide - SKF.com

Split Seal Fitting
All HS seals require a cover plate (fig. 8j). The cover plate provides
the compression fit necessary to ensure a leakproof seal. It should be
thick enough .250” to .500 inches (6.3mm to 12.70mm) not to bend
or distort. The cover plate should also be secured by bolts or studs no
more than 6” (152.40mm) apart on the bolt circle. Splitting the cover
plate in two or more sections will make seal replacement easier,
particularly in confined areas.
To block surges of lubricant toward the seal from the inside and to
protect the seal from damage from the outside, the cover plate I.D.
should be as close as practical to the shaft. Generally, 1/4” (6.3mm)
over shaft size is sufficient for clearance in the presence
of moderate shaft misalignment and run-out.
If supplementary sealing is required but it is impractical to machine
the original housing, the seal cavity may be incorporated into a new
plate which is then bolted into place.
Procedure
• Lightly lube seal O.D. and inner lip.
• Put seal around shaft.
• Install spring into its groove if required
• Make spring connection.
• Install butt-ends first at 12 o’clock position.
• Tap into place, alternately striking around seal.
• Install cover plate.
Cover plates ensure a
leakproof seal (fig. 8j.)
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