5 Service and maintenance
B 1000 en-4419 45
The oil does not need to be changed on gear units without oil level screw (please see chapter 7.1
"Versions and maintenance"). These gear units are lubricated for life.
Standard helical gear units have no oil level screw. Here, the oil is topped up through the pressure
vent bolt using the quantities listed in the table in Section 0 "Helical gear units".
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Checking the cooling coil for deposits
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Cleaning or replacing the vent plug
Unscrew the vent screw and thoroughly clean it (e.g. with compressed air) and fit the vent screw in the
same place, If necessary, use a new vent screw with a new sealing ring.
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Replace the shaft sealing ring
Once the shaft sealing ring has reached the end of its service life, the oil film in the region of the
sealing lip increases and a measurable leakage with dripping oil occurs. The shaft sealing ring must
then be replaced. The space between the sealing lip and the protective lip must be filled
approximately 50 % with grease on fitting (recommended grease: PETAMO GHY 133N). Take care
that after fitting, the new shaft sealing ring does not run in the old wear track.
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Re-lubricating bearings
For bearings which are not oil-lubricated and whose holes are completely above the oil level, replace
the roller bearing grease (recommended grease: PETAMO GHY 133N). Please contact the NORD
service department.
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General overhaul
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The general overhaul must be carried out by a specialist workshop with suitable equipment and be
qualified personnel with appropriate equipment in observance of national regulations and laws. We
recommend that the general overhaul is carried out by the NORD Service Department.
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For this, the gear unit must be fully disassembled and the following work must be carried out:
1. Clean all components of the gear unit
2. Examine all gear unit components for damage
3. All damaged components must be replaced
4. Replace all roller bearings
5. Replace all seals, shaft sealing rings and Nilos rings
6. Optional: Replace the backstop
7. Optional: Replace the elastomers in the coupling
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