Doc No: OMM50002312
Rev: C Page 35 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
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10.4 Servicing the Power End
10.4.1 Replacing Piston Rod Oil Seals
Ensure that all pressure inside the pump fluid cylinder has been bled off
before starting any service work.
ENSURE THAT THE POWER IS LOCKED OUT AND TAGGED OUT
BEFORE SERVICING ANY PART OF YOUR FMC PUMP
1. The piston rod oil seals (8) retain oil in the power end and prevent contamination
from entering the power end by way of the piston rods. The fluid end and
cylinders must be removed as outlined in the previous sections to provide access
to these seals.
2. Rotate the seal retainer (23) counter
clockwise until it is unthreaded from the
frame, then slide off the rod. Use a
screwdriver and mallet to unthread this
seal retaining nut similarly to the
example pictured to the right.
3. Pull the seal holder (7) out of the pump
frame and slide off of the rod. It may be
necessary to use two screwdrivers to
slide the seal holder out of the recess. A
slight rocking motion on the seal holder
may aid in removal.
4. Remove the seal retainer gasket (24) from the power frame. Inspect the seals (8)
and note the orientation of the seals prior to removal. The seals may now be
removed from the seal holder and discarded.
5. To rebuild, insert new seals (8) in the seal holder (7), ensuring they are oriented in
the same manner as the ones that were removed. Do not reuse seals that have
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