Specifications

Document No. DER05024
Effective Date 28 Mar 08
Supersedes
30 Aug 07
Page No. 1 of 5
MAIN BEARING REPLACEMENT
DE-7200 CENTRIFUGE
GENERAL
This procedure describes replacement of the main bearings. Excessive noise, vibration, or high
temperature 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.
Note! All attaching hardware must be correctly tightened. Refer to
DER05029
for hardware tightening requirements.
MAIN BEARINGS
The ends of the rotating assembly are supported by roller bearings fitted within pillow blocks. The
main bearings must be replaced as a set. Consequently, if one bearing is found defective, always
replace both bearings.
Bearing Removal
Either bearing may be removed first. In the following procedure, however, the solid end main
bearing is removed first, followed by removal of the liquid end bearing. If either bearing is found
defective, both bearings must be replaced as a set.
To remove the main bearings, 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. Stop feed, and shut down, lock out, and tag out electric power to the centrifuge. Allow rotating
assembly to coast to a full stop.
2. Remove screws securing belt guard to base, and lift and remove guard.
3. Remove screws securing case cover to case, and open case cover.
4. Remove screws securing both conveyor drive gearbox coupling halves together, and remove
coupling halves.
5. Disconnect feed pipe from feed component flange.