3.6 Shaft seal
Introduction
Depending on requirements, shaft seals prevent oil from escaping from the gear unit or dirt
from entering the gear unit.
3.6.1 Rotary shaft sealing rings
Rotary shaft sealing rings are the standard seal used. Wherever possible, rotary shaft sealing
rings are equipped with an additional dust lip which protects the actual sealing lip against
external contaminants.
NOTICE
Irreparable damage to the rotary shaft sealing ring caused by high concentration of dust
A damaged rotary shaft sealing ring might not be able to effectively seal the gear unit.
In very dusty atmospheres, do not use rotary shaft sealing rings unless they have additional
protection.
The diagram below shows a rotary shaft sealing ring
Figure 3-4 Rotary shaft sealing ring
3.6.2 Labyrinth seals
Labyrinth seals as non-contact seals prevent shaft wear. They do not require any maintenance
and improve the temperature behaviour of the gear unit. Labyrinth seals can only be used with
pressure lubrication and with a reduced oil level.
The spare parts drawing and spare parts list specify whether or not the gear unit is equipped
with labyrinth seals.
A labyrinth seal is illustrated in the diagram below:
Description
3.6 Shaft seal
Gear unit 5118en
26 Operating Instructions 10/2017
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