G80XW/XF, G115XW/XF, G150XW/XF, G200XW/XF - 50HZ
OPERATION & MAINTENANCE MANUAL
120
G100XW/XF, G135 XW/XF, G170XW/XF, G225XW/XF - 60Hz
Replacing the NDE bearing on single-bearing
machines
Dismantling
•
Remove the NDE shield [36].
•
Remove the ball bearing [70] using a screw puller.
Reassembly
•
Heat the inner slip ring of a new bearing by induction
or in a drying oven at 80 °C (do not use an oil bath)
and fit it to the alternator.
•
Place the preloading wavy washer [79] in the flange
and fit a new O ring seal [349].
•
Replace the NDE bracket [36].
Accessing the main field and stator
Dismantling
Follow the procedure for dismantling bearings.
•
Remove the coupling discs (single-bearing alternator)
or the DE flange (two-bearing alternator) and insert a
tube of the corresponding diameter on the shaft end
or a support made according the following bellow.
•
Rest the rotor on one of its poles, then slide it out. Use
the tube as a lever arm to assist dismantling.
•
After extraction, be careful with the fan. It is necessary
to replace the fan in case of disassembling.
•
After extracting the rotor, be careful not to damage the
fan and place the revolving field on special V-blocks.
NOTE: If intervention is required on the main field
(rewinding, replacement of components), the
rotor assembly must be rebalanced.
Reassembly
•
Follow the dismantling procedure in reverse order.
Take care not to knock the windings when refitting the
rotor in the stator.
If you replace the fan, respect the assembly guide
according the following bellow. Use a tube and a screw.
Follow the procedure for reassembling the bearings.
