
Doc. No.: OMS500000104
Rev: A Page 24 of 42
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5. Slide the deflector shield (23) off the end of the plunger rod (6).
6. Unbolt the four cap screws (17) holding the plunger rod seal housing (16) to the power
frame (1). If needed the cap screws (17) can be used to jack the seal housing (16) away
from the power frame (1) using the two tapped holes provided. Pull the seal housing
over the end of the plunger rod and out of the cradle. Repeat these three steps for the
other two seal housings.
7. Remove the cup seals (26) and the o-ring (24) from the seal housing (16). Note the
orientation of each seal prior to removing it.
8. Inspect the plunger rod (6) at this time. If it is scored or damaged in any way it must be
removed. To remove the plunger rod (6) unscrew it from the crosshead (5). A new
plunger rod (6) is screwed into the cross head (5) and torqued per the Fastener Torque
Requirements section of this manual.
9. Install a new o-ring (24) and new seals (26) in the seal housing (16) in the same
orientation that they were originally.
10. Replace the seal housing (16) in the power frame cradle over the plunger rod and into
position in the counterbore. Tap into position using a rubber mallet. The four cap screws
(17) can be used to evenly draw the seal housing (16) into place. Take care to avoid
folding the seal lips back when they are pushed over the plunger rod and cutting the o-
ring (24) when the seal housing (16) is installed in the power frame (1). A small amount
of motor oil on the plunger rod and the seal bore in the power frame (1) will aid this
process and provide lubrication to the seals (26) during start-up.