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GRN4-610 Chapter 5: Maintenance 42 of 73
Replacing the Rotor
The rotor has a heavy-duty design, which makes replacement necessary only after a
crash, i.e. a hammer falls inside the machine. Dismounting and mounting the rotor
requires specialized knowledge.
Dismounting the rotor
Follow the steps below to dismount the rotor.
1. Dismount the gearbox motor.
2. Remove the rotor mounting slot cover plates from the housing.
3. Screw in hooks on both shaft ends.
4. Remove the bearing housing mounting bolt.
5. Carefully lift the rotor out of the housing using suitable lifting equipment.
6. Place the rotor in a safe location (appropriately-sized timber beams are suitable
for this).
Mounting the rotor
Clean the bearing seat surfaces and check the key before proceeding as follows to mount
the rotor.
1. Lift the rotor using suitable lifting/stopping equipment and place the rotor
carefully into the bearing seats.
2. Attach the bearing housing (Pos) to the bearing seats with screws.
3. Place the gearbox motor onto the rotor axis.
4. Return the rotor mounting slot cover plates.
5. Carry out a test run.
Replacing the Main Bearings
The dimensions of the main bearings make a replacement necessary only in exceptional
cases. Dismounting and mounting the bearings requires specialized knowledge;
therefore, please observe all instructions provided by the manufacturer or call customer
service for assistance.
The bearings mounting in this machine are indicated in the spare parts list. A
requirement for dismounting and mounting the bearings is a suitable pulling-off device.