Figure 3-5 Labyrinth seal
To work reliably, labyrinth seals must be installed in stationary, horizontal positions without
dirty water or any substantial amount of dust. Overfilling the gear unit can result in leaks, the
same applies to oil with a high foam content.
3.6.3 Taconite seal
The taconite seal is a combination of two sealing elements:
● Rotary shaft sealing ring to prevent the escape of lubricating oil
● Grease-filled dust seal (comprising a labyrinth and a lamellar seal) to allow operation of the
gear unit in extremely dusty environments
The taconite seal is ideal for use in dusty environments.
NOTICE
Gear unit leaks caused by poor sealing
Regrease the labyrinth seals at the specified regreasing intervals. The regreasing intervals
are specified in the Maintenance schedule (Page 86).
A taconite seal is illustrated in the diagram below:
① Labyrinth, filled with grease, can be regreased ③ Lamellar seal
② Grease nipple ④ Rotary shaft sealing ring
Figure 3-6 Taconite seal
The following design variants of taconite seal are available:
Description
3.6 Shaft seal
Gear unit 5118en
Operating Instructions 10/2017 27
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