Pump and Fluid Systems
Chapter 5: Assembly/Disassembly
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MP-16 2-Piece 5000 psi January 2013
5.2
Power End Maintenance Procedures
The following are the standard procedures for disassembling the various components and
systems of the power end of the MP-16 pump. All personnel involved in the disassembly of
the power end must possess a thorough understanding of all of the following procedures,
especially any and all safety regulations involved.
5.2.1
Removing the Wiper Box & Diaphragm Plate
The crosshead diaphragm plates are all line bored with the pump frame, and must not be
interchanged. Take note of which cylinder and pump each plate was removed from so it can
be reinstalled properly. Do not attempt to remove the diaphragm plate unless the outer
diameter of the stub rod flange is greater than the inner diameter of the diaphragm plate itself.
1
Remove the Pistons as per 4.6.1.
2
Mark the outer surfaces of the wiper box
and diaphragm plates to indicate their
orientation in the pump frame.