Doc No: OMM50002312
Rev: C Page 26 of 54
Subject to contractual terms and conditions to the contrar
y, 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 FMCTI.
1. FMC recommends that a sufficient quantity of clean water is pumped through the
fluid end before starting any service procedures that involve fluid end
components. This will remove most contaminants left in the fluid cylinder by
normal pumpage and improve the ability to work with parts or see potential
problems.
2. 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.
3. To access the piston cups (38), the
cylinder cover clamps (43) must be
removed. Remove the six nuts (52)
holding the cylinder cover clamps in
place, and then remove the cylinder
covers (41). If the cylinder covers are
stuck to the fluid cylinder (34), insert a
flathead screwdriver or small pry bar to
pry off the cylinder covers (see picture
to the right). Do not remove the two
nuts on the short studs on opposite
corners of the fluid cylinder, as they
keep the cylinders (37) and fluid
cylinder mounted on the pump during
this operation.
4. Using a socket wrench with a long
extension, remove the hex piston nut
(53) from the piston/crosshead rod (6). This nut secures the piston assembly to
the piston/crosshead rod.
Pistons cups and assemblies can be removed with the fluid cylinder
attached to the power frame by the two remaining nuts on the short studs
to avoid replacing the cylinder gaskets.
5. Following the hex piston nut (53) removal,
use the FMC piston tool (A5049) to pull the
piston assembly from the cylinder (37).
Insert the FMC piston tool inside the
cylinder until flush with the face of the
slotted piston retainer nut (50). Twist the
tool to engage and lock the tabs of the tool
inside the mating slots in the retainer nut.
6. Pull the piston assembly free using a
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