DE-STA-CO S/SM300A - Manual (Page 32)

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SECTION 8: Repair and Replace (continued)
8.4. Oil Seal Replacement
8.4.1. Remove oil seals by drilling a number of holes into the seal case. The seal may
then be removed with a pointed tool. Be sure to remove all metallic chips created
during the drilling of removal holes.
8.4.2. Check dimensions – to be sure that shaft and bore diameters match those
specified for the seal selected.
8.4.3. Check seal – for damage that may have occurred prior to installation. A sealing lip
that is turned back, cut or otherwise damaged should be replaced.
8.4.4. Check bore – to see that the leading edge is deburred, A rounded corner or
chamfer should be provided.
8.4.5. Check shaft – remove surface nicks, burrs and grooves and look for spiral machine
marks that can damage the seal lip.
8.4.6. Check shaft end – remove burrs or sharp edges. The shaft end should be
chamfered.
8.4.7. Check splines and keyways – smooth any sharp edges and when necessary
protect the seal lip with an assembly sleeve or shim stock. Round the edges of the
spline or keyway as much as possible and lubricate with a hard, fibrous grease.
8.4.8. Check seal direction – make sure that the new seal faces in the same direction as
the original. Generally, the lip faces the lubricant or fluid to be sealed.
8.4.9. Pre-lubricate the sealing element before installation by wiping with lubricant
being retained.
8.4.10. Use the correct installation tool – press fitting tools should have an outside
diameter .010” smaller than the bore size. If possible, the center of tool should be
relieved so that pressure is applied only at the O.D.