Specifications

Document No. DER05024 MAIN BEARING REPLACEMENT
Page 4 of 5 Effective Date 28 Mar 08
Cleaning, Inspection, and Repair (Cont’d)
4. Inspect pillow blocks for corrosion, distortion, nicks, cracks, burrs, fractures, or other defects.
Repair any minor defects, or replace if serious defects or cracks are found.
5. Replace any component that cannot be easily repaired.
6. Replace all O-rings, seals, and bearings.
7. Place all cleaned components in clean plastic bags to prevent contamination.
Installation
The procedure describes installation of the solid end main bearing first, followed by the liquid end
bearing. However, either bearing may be installed first.
To install the solid end main bearing, proceed as follows:
1. Using a bearing heater or heated oil bath, heat main bearing inner race to about 230°F
(110°C). Wearing protective gloves, slide race onto journal.
2. Pack bearing with grease in accordance with lubrication chart in DER05023, and install
bearing (Figure 5024-1) onto inner race.
3. Install spacer ring and grease adjuster on gearbox shaft.
4. Slide shell and O-ring onto gearbox shaft, and secure shell by tightening setscrew.
5. Position input flange on gearbox housing, and install and tighten screws in accordance with
DER05029.
6. Place upper and lower halves of solid end pillow block on main bearing, and secure with
screws tightened to torque specified in
DER05029.
7. Orient sheave so that keyway aligns with key in gearbox shaft, and slide sheave onto shaft
and against input flange.
8. Secure sheave to bowl flange with screws installed in accordance with
DER05029.
To install the liquid end main bearing and re-install rotating assembly, proceed as follows:
1. Install O-ring (Figure 5024-2) and flinger on liquid bowl head journal.
2. Pack bearing with grease in accordance with lubrication chart in
DER05023, and install and
seat bearing on bowl head shaft.
3. Install retaining washer, O-ring, packing seal, and felt ring on bowl head shaft.
4. Install clamping ring on bowl head, and secure with screws. Tighten clamping ring setscrews
to torque specified in
DER05029.
5. Place upper and lower halves of liquid end pillow block on main bearing, and secure with bolts
tightened to torque specified in
DER05029.
6. Operate hoist to lower rotating assembly into centrifuge until pillow blocks contact base.
7. Use a brass hammer to fully seat alignment pins in bearing pillow blocks and base; then insert
mounting bolts with washers and spring washers through holes. Tighten bolts incrementally to
torque specified in
DER05029. Do not tighten nuts on alignment pins.