Gear units – Operating and Assembly Instructions
42 B 1000 en-4419
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5.2 Service and Maintenance Work
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Visual inspection for leaks
The gear unit must be checked for leaks. Attention should be paid to escaping gear oil and traces of
oil on the exterior or underneath the gear unit. In particular, the shaft sealing rings, cover caps, screw
fittings, hoses and housing joints should be checked.
Shaft sealing rings are components with a limited life and are subject to wear and ageing. The service
life of shaft sealing rings depends on various ambient conditions. Temperature, light (especially UV
light), ozone and other gases and liquids affect the ageing process of shaft sealing rings. Some of
these influences may change the physical or chemical properties of the shaft sealing rings and result
in a significant reduction of their service life. Foreign substances (e.g. dust, sludge, sand, metallic
particles) and excess temperature (excessive speed or external heating) accelerate the wear of the
sealing lip. These sealing lips are made of an elastomer material and are lubricated with a special
grease at the factory. This reduces the wear due to their function and ensures a long service life. An
oil film in the region of the rubbing sealing lip is therefore normal and is not due to leakage (please
see chapter 7.6 "Leakage and leak-tightness").
If leaks are suspected, the gear unit should be cleaned, the oil level checked and checked again for
leaks after approx. 24 hours. If a leak is confirmed (dripped oil), the gear unit must be repaired
immediately. Please contact the NORD service department.
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If the gear unit is equipped with a cooling coil in the housing cover, the connections and the cooling
coil must be checked for leaks. If there are any leaks, these must be repaired immediately. Please
contact the NORD service department.
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Check for running noises
If the gear unit produces unusual running noises or vibrations, this could indicate damage to the gear
unit. In this case the gear unit must be repaired immediately. Please contact the NORD Service
department.
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Check the oil level
Section 7.1 "Versions and maintenance"describes the mounting positions and the corresponding oil
level screws. With double gear units, the oil level must be checked on both units. The pressure vent
must be at the position marked in Section 7.1 "Versions and maintenance".
The oil level does not need to be checked on gear units without oil level screw (please see chapter 7.1
"Versions and maintenance").
Gear unit types that are not supplied full of oil must be filled before the oil level is checked.
Check the oil level with an oil temperature of between 20 °C to 40 °C.
1. The oil level may only be checked when the gear unit is at a standstill and has cooled down. The
gear unit must be secured to prevent accidental activation.
2. The oil level screw corresponding to the actual mounting position must be screwed out(please see
chapter 7.1 "Versions and maintenance").
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