BA 9142 en 02/2015
6.3.1
Maintaining preservation if the gear unit has been opened in the meantime
If a gear unit, which has been opened in the meantime for longer than 1 week, is left standing without
transport packing in exposed meanwhile roofed surroundings and if it is not possible every 7 days to flush
the gear unit for one hour with the oil-supply system and turn it for 15 minutes, the preservation can be
maintained in part by applying the measures specified in item 4.4.3.
6.3.2
Foundation
The foundation should be laid out in such a way that no resonance vibrations are created and that no
vibrations are transmitted from adjacent foundations. The foundation structure on which the unit is to be
assembled must be rigid. The structure must be laid out according to the weight and torque in
consideration of the forces acting on the gear unit.
NOTICE
Property damage
Damage from inadequate stability of the gear unit is possible.
The gear unit must be set up on a level, secure, vibration-free and rigid foundation. The levelness of
the gear unit standing surface is especially important, as the contact pattern of the teeth and the
carrying portion of the axial tilting pad thrust bearings depend on it and the service life of the gear unit
is affected by it.
All points on the gear unit base must lie between two imaginary parallel planes
0.1 mm per 500 mm (0.0036 inch per 1.5 ft) apart.
The permissible deviation of the gear unit base from the horizontal plane is
0.2 mm per 1 m (0.0072 inch per 3 ft).
Note
The levelness of the mounted base plate (gear unit set-up surface) has to be documented before
assembly of the gear unit.
The record must be kept with these instructions.
The foundation structure and the screw connection of the gear unit are within the responsibility of the
mill manufacturer.
6.4
Assembly of the gear unit
The gear unit must be installed under the vertical mill in accordance with the mill manufacturer's
instructions.
NOTICE
Property damage
Damage to the sliding bearings is possible.
The input shaft of the gear unit may be rotated maximally 1 time for positioning during installation, only
when the tilting pad thrust bearing chamber is filled with oil up to the specified level.
The floor screw connection has to be provided according to the requirements of the mill manufacturer.
Note
The separate operating instructions have to be observed if "superbolt nuts" are used.
Once the gear unit is aligned, the pins must be fitted if these are specified in the dimensional drawing.
Lateral stops can also be mounted in addition to prevent the gear unit from shifting.
