National/ Timken Seals Catalog - Norfolkbearings.com

SECTION 1-C TECHNICALSealing System Preparation And Seal InstallationINSTALLATION OF SEALS, PROCEDURES, GUIDELINES AND TOOLSOil Seal Installation Procedure1) Inspect the bore. Insure that it is clean and free of burrs that might distort the seal or cut the O.D., that may causeleakage. Check for roundness and make sure the leading edge is either rounded or chamfered.2) Inspect the shaft. Look for machining lead, burrs, dirt and paint that might damage the seal or provide a leak path. Ifthe old seal has worn a groove into the shaft, it needs to be repaired. In many cases, National Redi-Sleeves willenable you to quickly and inexpensively repair this condition. For more information, regarding National Redi-Sleevessee page 23 & 24.3) Inspect the Shaft End. Remove all burrs and sharp edges. The shaft should be chamfered or radiused to assure theseal is not damaged during installation. If this is not possible, then an installation sleeve should be used.4) Inspect Splines and Keyways. If the shaft has splines or keyways, cover with a sleeve, shim stock or tape to protectthe seal lip.5) Inspect the Seal. Check the seal for any damage (nicks, cuts, scratches or distortion of the sealing lip) that mayhave been caused during shipping. A damaged seal should be replaced.6) Assure Proper Seal Direction. The sealing lip usually faces toward the medium to be sealed.7) Prelube the Seal. Prior to installation, the sealing lip should be prelubed with the lubricant to be sealed. It is not necessaryfor the O.D. of metal parts to be lubed, however, a light film of oil should be applied to the O.D. of rubbercoated seals to aid in the installation process and reduce sheer stress during installation. This prelube should reduceor eliminate the possibility of a rubber O.D. seal from backing out of the bore immediately after installation.8) Installation Tools. Select an installation tool (see Fig below). For easy, accurate installation of National’s popular standardstyle oil and grease seals use the RD-2000 which can easily install seals up to 3.375” (85.7 mm) O.D. The besttool will have a diameter slightly smaller than that of the housing bore and will apply force only on the seal case.Bearing races may be used as an installation tool adapter when “approved tools are not available.9) Never Hammer Directly On the Seal. Screwdrivers, drift pins or punches should not be used as installation tools.Steel hammers are not recommended for use with approved installation tools; the shock of steel on steel can dislodgethe garter spring. After the seal has engaged the bore, the seal should be driven in evenly with only enoughforce to seat it in the bore.Recommended Installation ToolsINSTALLATIONTOOLFACE MACHINEDSQUARE WITHBOREAS CAST BORE FRONTAS CAST BORE FRONTINSTALLATIONTOOLBACK MIN RMACHINEDSQUAREWITHBOREINSTALLATIONTOOLTHROUGH BORE INSTALLATION TOOLBOTTOMS ON MACHINED BORE FACEBORETHROUGH BORE INSTALLATION TOOL BOTTOMS ON SHAFTBOTTOM BORE SEAL BOTTOMS ON MACHINEDBORE SHOULDERXVIII