Doc No: OMM50001243
Rev: C Page 45 of 68
This document and all the information contained herein are the confidential and exclusive property of TechnipFMC,
and may not be reproduced, disclosed, or made public in any manner prior to express written authorization by TechnipFMC.
10.4
Servicing the Power End
10.4.1
Replacing Plunger Rod Oil Seals and Plunger Rods
The plunger rod oil seals (20) retain oil in the power frame and prevent dirt, water, or
other contaminants from entering the power frame by way of the plunger rods. The
plunger rod oil seals can be replaced with the fluid cylinder still installed but the plunger
must be removed. Refer to section 10.1 for plunger removal.
WARNING
Many accidents occur every year through careless use or service of
mechanical equipment. You can avoid hazards associated with high-
pressure equipment by always following the safety precautions listed in
Section 1.0.
NOTE
Ensure that all pressure inside the pump fluid cylinder has been bled off
before starting any service work. CAUTION: CHECK TO ENSURE THAT
THE POWER IS LOCKED OUT AND TAGGED OUT
1. Remove the cradle cover (28) from the power frame (1) by removing the wing
nuts (29).
2. Slide the deflector shield (21) off the end of the plunger rod.
3. Remove the seal holders (19) by threading the special puller (FMC p/n 5259112)
over the seal holder and prying them out. Pull the seal housing over the end of
the plunger rod and out of the cradle. Repeat steps 3, 4, and 5 for the other two
seal housings. Installation Tip: Spray the seal housing outside diameter (where it
joins the power frame) and plunger rod with penetrating oil like WD-40 to aid
removal.
4. Remove the seals (20) from the seal housing (19). Note the orientation of each
seal prior to removing it.
5. Inspect the plunger rod at this time. If it is scored or damaged in any way, it must
be removed. The plunger rods are staked in the crosshead. Therefore, the
crosshead assemblies must be replaced if a plunger rod is damaged.