MSI QI-1000, Technical Manual, Page: 45 / 56

6.40 Removing Plungers and Packing
a) Remove the plunger lube fitting from each packing nut.
b) Using the MSI packing nut tool (FEC0027), loosen each of the packing nuts at least one full
turn.
c) Remove the suction covers using MSI Wrench (FEC0024).
d) Using the MSI plunger wrench (FEC0023), unscrew the plunger from the crosshead and pull
each plunger out of the fluid cylinder through the suction cover bore. Care must be taken to
keep contaminants from entering the Power Frame section once the plunger is removed.
e) When removing the plunger packing, try to keep the Stuffing Reducer Adapter (Seal Ring) in
the Fluid End using MSI Adapter Stuffing Reducer Retaining Tool
(FEC0115,-116,-117,-118,-119). Keeping the Stuffing Reducer Adapter
(FEC0066,-10,-58,-59,-36) in the Fluid End will make the removal easier. Once the packing nut
is removed, the Stuffing Reducer Adapter (FEC0066,-10,-58,-59,-36) may then be removed
from the cylinder. Label each packing nut on removal to ensure that they are installed back into
the same bore. Note that the packing nuts are numbered to their corresponding cylinders.
f) Inspect each plunger for wear, scoring, and corrosion on the hard surface area and damage to
the face which mates with the crosshead.
g) Inspect each ring of packing brass for excessive wear and scoring.
h) Blow air through the lube port on each packing nut to ensure that the lube passage is
unobstructed.
i) Each packing bore, both inside the packing nut and inside the fluid cylinder, must be thoroughly
cleaned and lightly hand polished with a 220 to 240-grit Emery cloth prior to packing
reinstallation.
j) Using new packing header rings and new packing pressure rings, reinstall the packing assembly
one piece at a time (refer to the Packing Assembly diagram included in this manual). Each ring
should be installed with a coating of light oil only. Care must be taken to avoid damaging the
internal and external sealing lips of each packing ring.
k) Replace the o-rings and back up rings in the seal rings and dress the seal ring seal areas in both
the fluid cylinder and packing nut with 220 to 240 grit Emery cloth. Reinstall the seal rings as
shown in the packing assembly diagram.
l) Reinstall each packing nut into its proper cylinder, screwing it all the way in until tight, then
backing it off one to two turns.
m) Coat the hard surface area of each plunger with a light oil and insert it into the packing. Using
MSI Plunger Wrench and 10 lb. hammer, bump the plunger into the packing while holding it as
straight as possible with the packing bore centerline. Continue bumping the plunger through the
packing until the threaded bore approaches the crosshead stud. Carefully align the plunger and
crosshead threads then rotate the plunger clockwise until the plunger is fully seated on the
crosshead.
n) Tighten the plunger to the crosshead with the MSI plunger wrench to achieve 300 ft*lbs of
torque.
o) Using the MSI packing nut wrench, tighten each Packing Nut until it stops.
NOTE: The packing nut will need to be retightened only once after the pump is reassembled
and run under pressure for a few revolutions. After that, the packing is completely
self-adjusting.
p) Reinstall the check valve and lube fittings into the packing nut.
q) Reinstall the suction covers as outlined earlier.