Doc. No.: OMS500000104
Rev: A Page 20 of 42
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Figure 3: Plunger Packing Replacement
6. An alternate method for removing the stuffing box assemblies is to remove the nuts (78)
that hold the cylinder covers (76) on the front of the fluid cylinder (38) and remove the
cylinder covers (76). With the covers off, remove the plungers (46) by pulling them out
through the front of the fluid cylinder (38). The stuffing box assemblies can then be
removed through the cradle area of the pump. The advantage to this process is that the
stuffing box assemblies are much lighter with the plungers removed.
7. Inspect all parts for damage or unusual wear patterns and replace any components that
appear damaged. Insure that the plungers are smooth and free of cracks, scores and
grooves. New packing will fail prematurely if used with plungers that have damaged or
have rough surfaces. FMC recommends that all three packing sets be replaced, not just
those that show signs of leakage, whenever this type of service is performed. This will
help insure maximum operation time between service intervals.