6
Inspection/maintenance
Wearing parts
Assembly and Operating Instructions – Explosion-Proof Gear Units
109
6.1
Wearing parts
Gearing
If the SEW‑EURODRIVE design criteria and the intervals for inspection and mainten-
ance are observed, the gearing components are wear-free after the run-in period. For
constructional reasons, the worm gearing is an exception. The amount of material ab-
rasion on the worm gear tooth flanks varies depending on the operating conditions.
The main influencing factors are:
•
Rotational speed
•
Load
•
Operating temperature
•
Lubricant (type, viscosity, additives, pollution)
•
Switching frequency
For information on the worm gearing service life under certain operating conditions,
contact SEW-EURODRIVE.
Rolling bearing
Rolling bearings in the gear unit, adapter and input shaft assembly have a limited ser-
vice life, even under ideal operating conditions. This nominal bearing service life is a
solely statistical value. The actual service life of an individual bearing may deviate
greatly from this value. The main influencing factors are:
•
Rotational speed
•
Equivalent bearing load
•
Operating temperature
•
Lubricant (type, viscosity, additives, pollution)
•
Lubricant supply of the bearing
•
Misalignment under operating load
Therefore the rolling bearings must be inspected regularly. Observe the corresponding
inspection and maintenance intervals in the chapters
"
),
"
Lubricant change intervals" (→
112), and "AD input shaft assembly maintenance" (→
117).
For information on the nominal bearing service life under certain operating conditions,
contact SEW-EURODRIVE.
Lubricants
Lubricants are subject to aging. Their service life is limited depending on the load con-
ditions.
The service life significantly depends on the oil operating temperature. The depend-
ency of lubricant change intervals and operating temperature is depicted in the figure
in chapter "Lubricant change intervals" (→
Oil seals
Oil seals are contact seals that are used to seal unit housings at emerging elements,
such as shafts, from the environment. Oils seals are wear parts with a service life that
is influenced by various factors. For example:
•
Shaft speed and circumferential speed at the sealing lip
•
Ambient conditions (temperature, dust, humidity, pressure, chemicals, radiation)
•
Lubricant (type, viscosity, additives, pollution)
•
Surface quality of the sealing
•
Lubricant supply of the sealing
•
Oil seal material
24804134/EN – 05/2018