Specifications

Document No. DER05017
Effective Date 25 May 07
Page No. 1 of 12
BEARING REPLACEMENT
DE-1000 CENTRIFUGE
GENERAL
This procedure describes replacement of the main bearings installed in the pillow blocks as well
as the conveyor bearings located inside the conveyor. Excessive noise or vibration during
centrifuge operation may indicate defective bearings. If such conditions are evident, the bearings
should be inspected for looseness and replaced if necessary.
Bearing replacement must be performed by properly trained and qualified personnel. To prevent
contamination of the new bearings and internal components of the centrifuge, the replacement
procedure must be performed in a clean environment.
Refer to
DER05102 for tools and equipment used in the procedures in this section.
PILLOW BLOCK BEARINGS
The ends of the rotating assembly are supported by roller bearings fitted within pillow blocks.
Components on each side of the pillow block form a labyrinth grease cavity, which prevents
contaminants from entering. The roller bearing has a separate inner race, which must be removed
from the bowl head shaft following removal of the bearing.
The pillow block bearings must be replaced as a set. Consequently, if one bearing is found
defective, always replace both bearings.
Removal
Either bearing may be removed first. In the following procedure, however, the liquid end pillow
block bearing is removed first, followed by removal of the solids end bearing. If either bearing is
found defective, both bearings must be replaced as a set.
Liquid End Pillow Block Bearing
To remove the liquid end main bearing, proceed as follows:
WARNING! TO AVOID SERIOUS PERSONAL INJURY BE SURE EQUIPMENT
IS LOCKED OUT, TAGGED OUT, DE-ENERGIZED, AND HAS STOPPED
ROTATING BEFORE PERFORMING MAINTENANCE AND/OR ADJUSTMENTS.
1. Shut down, lock out, and tag out electric power to the centrifuge. Allow rotating assembly to
coast to a full stop.
2. Open case cover, and remove screws securing pillow blocks at liquid and solids ends to case.
3. Using a suitable hoist, lift rotating assembly to separate pillow blocks from bottom of case
leaving sufficient clearance to permit removal of pillow blocks.