NORD Drivesystems B2050 - Manual (Page 37)

5. Service and maintenance
www.nord.com B2050-GB-0613 -37-
Changing the oil
The Figures in Section 6.1 show the oil drain screw, the oil level screw and the pressure vent
screw for various designs.
Procedure:
1. Place a catchment vessel under the oil drain screw or the oil drain cock.
2. Completely unscrew the oil level screw and the oil drain screw, or open the oil drain
cock.
Danger!
Warning: Hot oil!
3. Drain all the oil from the gear unit.
4. If the screw securing coating or the thread of the oil drain screw or oil level screw are
damaged, a new oil level screw must be used or the thread cleaned and coated with
securing lubricant, e.g. Loctite 242, Loxeal 54-03 prior to screwing in. Check the sealing
ring for damage. Replace with a new sealing ring in case of damage.
5. Support the seal ring, insert the oil drain screw into the hole and tighten to the correct
torque or close the oil drain cock. (See Section 6.4 for torque values).
6. Using a suitable filling device, refill with oil of the same type through the oil level hole
until oil emerges from the oil level hole. (The oil can also be filled through the pressure
vent screw or a sealing plug located higher than the oil level).
7. Check the oil level at least 15 min after filling and proceed as described in Section 4-1.
Replacing the oil filter
The oil filter must be changed according to the operating instructions from the supplier.
Replacing the shaft sealing ring
Shaft sealing rings are rubbing seals made from an elastomer material and according to their
principle are subject to natural wear. The wearing life of shaft sealing rings depends on many
factors and cannot be calculated in advance. 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. To reduce the risk of
leaks due to worn shaft sealing rings we recommend that as a precaution, the shaft sealing rings
are replaced after every 25,000 operating hours or every 5 years. 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.
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.