Chapter 4: Maintenance; Pump And Plunger Seal Assembly; Removing The Pump Body - Microfluidics Microfluidizer LM20 User Manual

Chapter 4: Maintenance

Chapter 4 provides user maintenance procedures. The procedures are categorized by system component.
Component categories include the hydraulic power system, hydraulic filter and strainers, limit switches,
plunger seal, hydraulic drive, hydraulic cylinder, tie-rods, check valves, and coned and threaded
connections. A filter service schedule and hydraulic oil service schedule are included as well as procedures
for making hydraulic adjustments.
• All stainless steel threaded connections should be lubricated. Microfluidics recommends Never-
Seez food grade compound.
Always make sure that the system pressure is relieved before servicing.
•
Never tighten fittings while under pressure.
•

4.1 Pump and Plunger Seal Assembly

Replace the plunger seal when there is excessive product discharge from the drain hole in the isolator. To
access the plunger seal, first remove the pump body from the isolator by carefully following the procedure
below. The high pressure seal, back-up ring, and bearing must be replaced together.

4.1.1 Removing the Pump Body

1. Disconnect the power supply.
2. Disconnect any liquid quench tubing, if applicable.
3. Remove the reservoir from the check valve body by removing the tri
clamp connection.
4. Using the 5/8" open-ended wrench, loosen the glands and remove the
process piping and Interaction Chamber (IXC) directly below the pump
body and the isolator.
5. Loosen the 2.75" locknut as follows: Obtain the spanner wrench (P/N
16.2102). Place the spanner wrench around the 2.75" locknut and insert
the spanner wrench tooth into one of the locknut grooves. Obtain a
rubber head mallet and strike the end of the spanner wrench handle so
as to rotate the locknut in a counter clockwise direction. Back off the
locknut to allow the pump body to rotate.
6. Remove the pump body. Rotate the pump body in a counter clockwise
direction. Once the threads are no longer engaged, carefully pull the
pump body away from the isolator and off the plunger.
MANUAL.LM20 Revision C
Picture 1 – Removing Pump Body
January 2023 Page 22 of 52