Edition: 11/2007
Technical Instructions
Commissioning and Maintenance Guide
TAM 00 526
Page 15 / 18
4.2 Bearings
Depending on the operating conditions, (e.g. mode, temperature, speed and load), the service life of the
bearings and sealing elements can differ greatly.
In the case of troublefree operation, we generally recommend the following maintenance procedures:
• replacement of the bearings after 20,000 running hours (The bearings are designed for a calculated
service life of 20,000 running hours)
• replacement of the shaft sealing ring, if provided, and if no leaking is detected in the course of previ-
ous inspections, after approx. 5,000 running hours.
Motors up to size 200 are permanently lubricated; sizes 225-250 to A-S have regreasing mechanisms
with grease regulation: sizes 280 and above to A- and B-S have regreasing mechanisms with grease
regulation.
Lubrication intervals (in operating hours)
Size Speed
1,000 RPM
1,500 RPM
2,000 RPM
2,500 RPM
3,000 RPM
Amount of
grease with
regreasing
225, A-S 7500 4500 3000 2000 1500 50 g
250, A-S 6500 4000 2500 2000 1500 65 g
280, A-S, B-S 6500 3500 2000 1500 75 g
The lubrication intervals can be increased by 1.5 times for versions with ball bearings at the drive end.
The lubrication intervals are based on bearing manufacturer data for normal operating conditions. Use
only lithium base-saponified special rolling-contact bearing grease (e.g. Calypsol H 443) for initial or
regreasing. Before carrying out regreasing, check that the bearings of machines without regreasing
mechanisms are functioning correctly and replace them if necessary.
Bearing assignment with standard motor
Size A Side B Side
110 NU 208 E 6306 2ZR C3
112 NU 210 E 6209 2ZR C3
132 NU 212 E 6211 2ZR C3
160 NU 214 E 6212 2ZR C3
180 NU 2213 E 6310 2RSR C3
200 NU 314 E 6310 2RSR C3
225 NU 316 E 6311 2RSR C3
250 NU 2219 E 6313 2ZR C3
280 NU 2220 E 6316 C3
4.3 Intake opening for cooling air
When carry out maintenance work on the commutator, the intake opening for cooling air must be
checked for dirt and, if necessary, cleaned.
In the case of heavy dirt deposits, which could, for example lead to the intake grid being blocked, it
may be necessary to significantly increase the cleaning frequency
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