SKF Bearings and Seals - SKF.com

34A
Oil seal installation instructions
1. Check the bore. — The leading edge must be
deburred. A rounded corner or chamfer should be
provided.
2. Check the shaft. — Remove surface nicks,
burrs, grooves and spiral machine marks (machine
lead).
3. Check the shaft end. — Remove burrs or sharp
edges. The shaft end should be chamfered in
applications where the shaft enters the seal against
the sealing lip.
4. Check splines and keyways. — Sharp edges
should be covered with a lubricated assembly
sleeve, shim stock or tape to protect the seal lip.
5. Check dimensions. — Be sure shaft and bore
diameters match those specified for the seal
selected.
6. Check for parts interference. — Watch out for
other machine parts that might rub against the seal
and cause friction and damaging heat.
7. Check the seal. — Damage may have occurred
prior to installation. A sealing lip that is turned back,
cut or otherwise damages should be replaced.
After installation
8. Check seal direction. — Make sure that the new
seal faces in the same direction as the original one.
Generally, the lip faces the lubricant or fluid to be
retained.
9. Use the correct installation tools. — Press
fitting tools should have an outside diameter
approximately .010" (.254 mm) smaller than the
bore size. For best results, the center of the tool
should be open so that pressure is applied only at
the outer edge.
10. Pre-lubricate the sealing element. — Before
installation, wipe the element with the lubricant
being retained.
11. Never hammer directly on the surface of the
seal. — Use proper driving force,such as a soft-face
tool, arbor press, or soft workpiece (wood). Apply
force evenly around the outer edge to avoid cocking
the seal.
12. Position the seal properly in the housing and
inspect for alignment and installation damage.
1. If painting, be sure to mask seal to avoid getting paint on the lip or the shaft where lip rides. Also, mask vents so
they will not become clogged.
2. If paint is to be baked or the mechanism otherwise subjected to heat, seal should not be heated to temperatures
higher than the seal lip can tolerate.
3. In cleaning or testing, do not subject seals to fluids or pressures that could damage them.