Four main conditions make the seal and shaft more compatible and assist in providing optimal seal performance.
Normally seal contact area of the shaft should be Rockwell C 45 minimum. It is and important factor to prevent excessive wear, deformation, scratches or nicks, and to control the roughness or machining surface easily.
SHAFT SURFACE ROUGHNESS
The recommended shaft surface roughness is as follows:
Rotating Shift: plunge grinding is recommended.
Without proper chamfer on shaft, the seal lip may be damaged or distorted resulting in dislodged garter spring. We suggest chamfer as Table 2-3 to assist in the installations process.
The advisable sequence of installation is to install the seal over shaft and then into the housing bore. Care should be exercised not to damage or deform the seal lip. The proper chamfer angle will minimize this problem. When installing the seal over a keyway or spline, you should employ a sleeve or bullet to protect the sealing lip from being cut.
When the shaft is installed through the seal, the centering guides for the shaft will prevent the deformation of lip and the dislodging of spring. If possible, the shaft should be rotated as it passes through the seal to reduce sliding friction.
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