Industrial seal self study guide - SKF.com

Installation (cont.)
Corrective Actions
Use the correct tools and procedures to apply uniform pressure to
press fit the seal in the housing.
To install a large diameter
seal, tap around the seal in the
sequence shown above (fig. 8h).
HS8
Connect the split seal’s spring after
the seal is placed around the shaft
(fig. 8i).
Large Diameter Seal Installation
Installation of a large diameter seal follows the same procedures
as those used in standard seal installation. Follow these steps:
• Check the bore, shaft, shaft ends, splines and keyways, for
imperfections, dirt and anything that shouldn’t be there.
• Check dimensions. Be sure the correct seal size has been selected.
• Check for parts interference. Watch out for metal-to-metal contact
between the seal shell and shaft surface.
• Check the seal. Is it the right style for the application?
• Check seal direction. The seal lip should be pointed toward
the lube for retention, or away from the lube for dirt exclusion.
• Pre-lube the sealing element. Always use the same lubricant
as the one used in the application.
• Position the seal properly. Be sure it sits squarely in the bore.
During installation, never hammer directly on the seal. Because
of their size, it is often not possible to apply uniform pressure across
the seal at one time.
For flush installation:
Use a board or wooden block to progressively tap the seal into the
bore. A little at a time, gradually ease the seal into the bore. Gently tap
at 9 o’clock, 3 o’clock, 12 o’clock and 6 o’clock positions to avoid cocking
the seal (fig. 8h).
Large Diameter Split Seal Installation
A large diameter split seal is correctly installed by following these steps:
• Lightly lubricate the seal’s O.D. and inner lip.
• Apply the seal around the shaft, positioning it at the desired
location with the butt ends of the seal at the 12 o’clock position.
• Make the spring connection (see following section for details) (fig. 8i).
• Tap the seal in place, alternately striking lightly around
its circumference.
• Install the cover plate.
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