Shimadzu, 228-52069-44, Plunger Holder Assembly, LC-40DXR/XS/X3

The Shimadzu Plunger Holder Assembly is a dedicated high-pressure pump replacement assembly for compatible LC-40DXR, LC-40XS and LC-40X3 family configurations. The assembly provides the mechanical support and positioning needed for proper movement of the pump plunger and includes a diaphragm within the holder assembly. Correct plunger alignment is important for stable high-pressure solvent delivery and for preventing abnormal wear on contact surfaces and seals. Inspect the assembly during service when pump mechanics, pressure repeatability or a damaged diaphragm indicate possible component deterioration. Before installing the part, release system pressure, isolate the pump from mobile phase and examine neighbouring seals for debris or deformation. After replacement, prime and leak-check the fluidic circuit, then verify the pump's pressure stability under a suitable test condition. This is a plunger-holder assembly with an included diaphragm, not an individual replacement diaphragm pair, check valve or full chromatographic pump.