Rotary Seal Design Guide - Seals Unlimited

Catalog EPS 5350/USAEngineeringProTech Bearing IsolatorsTable 8-3. Troubleshooting Guide88Trouble Sign Possible Source Suggested RemedySeal OD LeakageSeal ID LeakageSeal Leakage from DrainPortSeal Leakage from betweenRotor and StatorHousing bore too rough, pitted, severecorrosion, grooved, etc.Insufficient OD O-ring fitSeal OD O-ring damaged during installationSeal OD O-ring damaged from chemicalincompatibilityShaft surface too rough — pitted, severecorrosion, grooved, etc.Insufficient ID O-ring fitSeal ID O-ring damaged during installationSeal ID O-ring damaged from chemicalincompatibilityInternal pressure presentProTech 360 only, internal pressure > 5 psiInternal sealOil level toofailurehighInternal pressure presentProTech 360 only, internal pressure > 5 psiInternal sealfailureImprove finish to recommended limits. (SeePage 8-13.)Measure bore diameter, compare to nominalrequired dimensions of equipment and sealrequirements.Protect O-ring from all sharp burrs at leadingedge of bore. A chamfer should be used onleading edges. Lubricate O-rings prior toinstallation. (See Page 8-12.) Care shouldalso be used when storing the seal for futureusage.Consult chemical compatibility chart inAppendix H. (FKM is the standard ProTechO-ring material unless specified otherwise.)Improve finish to recommended limits. (SeePage 8-13.)Verify shaft diameter, compare to nominalrequired dimensions of equipment and sealrequirements. Verify nominal seal dimensionsmatch actual shaft diameter.Protect O-ring from all sharp burrs at leadingedge of shaft. A chamfer should be used onleading edges. (See Page 8-12.) Care shouldalso be used when storing the seal. Toprevent cutting, protect ID O-rings from shaftkeyways, splines, etc. Use proper installationtools to prevent seal O-ring damage.Consult chemical compatibility chart inAppendix H. (FKM is the standard ProTechO-ring material unless specified otherwise.)Vent housing if possible. If vented, verifybreather or pressure limiting device isfunctioning correctly. Up to 5 psi, upgradeseal design to ProTech 360.Vent housing if possible. If vented, verifybreather or pressure limiting device isfunctioning correctly.Contact Parker Application Engineering.Lower oil level. Ensure internal oil drains areadequate. Upgrade seal design to ProTech360.Vent housing if possible. If vented, verifybreather or pressure limiting device isfunctioning correctly. Up to 5 psi, upgradeseal design to ProTech 360.Vent housing if possible. If vented, verifybreather or pressure limiting device isfunctioning correctly.Contact Parker Application Engineering.03/28/068-6 Parker Hannifin CorporationEPS DivisionToll Free: (800) 233-3900www.parkerseals.com