BA 9142 en 02/2015
10.7.3
Check tightness of screw connections
All screw connections that are used for inspection or maintenance have to be checked for firm seat (see
item 6.13 "Screw connection classes, tightening torques and initial stressing forces").
Tighten plate screws with the required initial stressing force or torque.
The initial stressing force or torque can be found on the dimensions sheet.
Note
The separate operating instructions have to be observed if "superbolt nuts" are used.
Note
Damaged bolts must be replaced with new bolts of the same type and strength class.
10.8
Welding work on the mill
Note
Siemens will accept no liability for damage caused to the gear unit by welding work carried out on the
mill.
WARNING
Risk of personal injury from electrical shock.
Risk of electrical shock during welding work.
Before welding work may be conducted on the mill, a potential equalisation must be provided
according to the regulations and/or guidelines applicable for this purpose.
The gear unit must not be used as an earthing point for welding operations. Optionally, an earth wire
may be present on the tilting pad thrust bearing chamber, which must be connected with the output
flange. For this purpose, use the threaded holes provided on the side of the output flange. When the
welding work has finished, the earth cable must be removed from the output flange. If no threaded holes
for earth connection are available on the gear unit, other appropriate measures must be taken. This
work must always be done by
specialist electricians
.
