Page 278 - Katalog náhradních dílu a komponent pro všeobecnou údržbu 2015|16

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When bonding the seal in the housing, the adhesive may not under any circumstances come into contact with the shaft or the sealing lip.
Installing the shaft
■ When fitting over a keyway on the shaft, the groove on the shaft must be covered with a protective cap (→ Fig. 14), to avoid damage to the sealing lip
■ Wall thickness of protective cap < 0,5 mm (0.02 in) to avoid over-stretching the sealing lip
■ When fitting part of a unit with a pre-assembled seal, a centering pin should be used to avoid tilting, which would damage the sealing lip
■ When fitting a long shaft, the use of a guide plate to guide the shaft parallel is recommended to avoid deformation of the sealing lip.
■ I f parts of the unit with a press fitting and the same nominal diameter are pushed over the contact area, the diameter of the contact area is to be reduced by 0,2 mm (0.008 in) to avoid damage to the contact area. The sealing function is not impaired by the reduction of the diameter.
Installation of Simmerring with sealing lip made from PTFE
The same recommendations for Simmerring with elastomer sealing lip according to DIN 3760 apply to installing Simmerring with PTFE sealing lip.
It is important that the PTFE sealing lip is not damaged, especially when assembling the front side in the direction of the installation. The use of a pilot shaft with a chamfer angle of 10° ... 15° (→ Fig. 14) is recommended. Replacement of Simmerring
New seals must always be installed during the repair or overhaul of a unit. The sealing lip of the new seal must not be positioned over the old contact surface. Suitable measures for achieving this situation are:
■ Installation of spacer rings (→ Fig. 15)
■ replacement of shaft sleeves or selection of different
press-in depth in the bore.
3
Fig. 15 Installation during repair and unit assembly
Original installation
Installation in case of repair
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