Removing The Bearing Retainer And Bearing; Removing The Plunger Seal And Back-Up Ring - Microfluidics Microfluidizer LM20 User Manual

4.1.2 Removing the Bearing Retainer and Bearing

1. Remove the bearing retainer. First place the pump body in a vise. It is recommended that the vise
teeth be made of brass. Wrap the pump body in a rag or cloth so that the vise teeth do not scratch
or damage the pump body.
2. Obtain the bearing retainer removal tool (P/N 801.13473). Place the dowel pins into the bearing
retainer slots and rotate the removal tool in a counter clockwise direction. Remove the bearing
retainer.
Picture 2 - Removing Bearing Retainer
3. Remove the bearing from the bearing retainer. The bearing, plunger seal and back-up ring should
always be replaced together. To remove the bearing, obtain a pair of needle nose pliers. Insert
the pliers' tips into the notches in the bearing retainer. Apply pressure to the bearing by squeezing
the needle nose pliers until the bearing cracks. Remove all the bearing pieces and discard them.
Clean the bearing cavity.

4.1.3 Removing the Plunger Seal and Back-Up Ring

1. The seal and back-up ring are located in the pump body. (Do not scratch the seal cavity when
removing the seal. Do not attempt to remove the seal with a screw driver or similar tool).
2. With the bearing retainer removed from the pump body, place the flat end of the pump body on
a smooth surface so that the seal cavity is visible.
3. Obtain the gland and plug from the Tool Kit. (P/N 15.2200 and 15.2000).
4. Place the .25 HP gland over the stem of the .25 HP plug.
5. Insert the plug and collar hand-tight into the outlet port on the pump body.
6. Place the pump body in a sink and fill the seal cavity with water.
7. Insert the seal removal rod (P/N 71.4007) into the seal cavity. The rod will grab onto the seal and
back-up ring.
8. Place a rag over the seal removal rod and seal cavity to prevent any splashing water.
9. Obtain a blunt object and strike the seal removal rod with a quick force. With only one opening in
the pump body (the inlet check valve should still be installed), the force on the rod will push the
water up, thus forcing the seal and back-up ring out of the seal cavity.
MANUAL.LM20 Revision C January 2023 Page 23 of 52