Specifications

Document No. DER05025
Effective Date 28 Mar 08
Supersedes
30 Aug 07
Page No. 1 of 4
CONVEYOR BEARING REPLACEMENT
DE-7200 CENTRIFUGE
GENERAL
This procedure describes replacement of the conveyor bearing. This procedure requires removal
of the conveyor assembly from the bowl assembly. Excessive noise or vibration during centrifuge
operation may indicate a defective bearing. If such conditions are evident, the conveyor should be
removed and the bearing inspected for looseness and replaced if necessary.
Bearing replacement must be performed by properly trained and qualified personnel. To prevent
contamination of the new bearing 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 the torque
chart in
DER05029 for hardware tightening requirements.
REMOVAL
The liquid end of the conveyor is supported by a roller bearing fitted within a housing in the
conveyor. The solid end is supported by the conveyor drive gearbox bearing. If the liquid end
bearing is found defective, always check for gearbox shaft looseness. The gearbox shaft bearing
must also be replaced if shaft looseness is found.
To remove the conveyor 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 (refer to DER04098). Allow
rotating assembly to coast to a full stop.
2. Disconnect feed piping from feed component.
3. Remove screws securing belt guard to base, and lift and remove guard.
4. Remove screws securing case cover to case, and open case cover.
5. Remove conveyor drive gearbox in accordance with the gearbox removal procedures in
DER05037.
6. Hoist liquid end of rotating assembly until rotating assembly is vertical (Figure 5025-1), and
then place solid end on a stable flat surface. Maintain suitable support of rotating assembly in
vertical position throughout remainder of conveyor removal procedure.