
Doc. No.: OMS500000104
Rev: A Page 22 of 42
Subject to contractual terms and conditions to the contrary, this document and all the information contained herein are the confidential and exclusive
property of FMC Technologies, and may not be reproduced, disclosed, or made public in any manner prior to express written authorization by FMC.
9.2
Removing the Fluid Cylinder
1. The fluid cylinder is removed to inspect for internal damage or to be refurbished.
2. To make service easier, it is suggested that several gallons of clean water be pumped
through the M28 before any service procedures that involve fluid end components are
started. This action will remove a significant portion of contaminants left in the fluid
cylinder by the normal pumpage and improve the ability to work with the parts or spot
potential problem areas.
3. Bleed off all pressure inside pump fluid end before starting any service work. Shut the
valve on the inlet piping if provided to prevent flow of liquid from the source into the
pump during service.
CHECK TO INSURE THAT THE POWER IS LOCKED
OUT.
4. Unbolt the plunger clamps (15) and remove them from the plungers (46) and plunger
rods (6). Slide all of the plungers forward as far as possible.
5. Disconnect the suction and discharge piping.
6. Remove the lock nuts (63) holding the fluid cylinder assembly on to the power frame (1).
Support the weight of the fluid cylinder assembly and slide the assembly away from the
power frame (1).