Document P/N: 2P136539
Release Date: 05/25/2017
Revision: F
34 of 42
To Change Plungers and Packing:
1.
Using a 3/8” hex key wrench, remove the two 1/2” socket head capscrews from each of the
plunger clamps. Separate the two halves of each plunger clamp and remove them being careful to
keep them in matched pairs. Inspect each clamp for wear or damage to the tapered shoulders
inside.
2.
Using the SPM
®
packing nut tool, loosen each of the packing nuts at least one full turn.
3.
Separate the plunger from the pony rod being careful to avoid damaging the mating face of either.
4.
Remove the suction covers as outlined earlier in “To Remove Valves & Seats”.
5.
Slide each plunger away from the pony rod and out of the fluid cylinder through the suction cover
bore.
6.
Completely remove each packing nut from the packing gland thread bore.
7.
Using an aluminum bar and 2½” pound hammer, lightly tap on the packing spacer – first to one
side and then the other – driving the packing assembly toward the power end – until each packing
ring falls out of the packing bore.
8.
Inspect each plunger for wear, scoring, damage, and corrosion on the hard surface area as well as
wear on the tapered plunger clapper flange and damage to the face which mates with the pony
rod. The mating face and tapered flange of each pony rod should also be inspected closely for
wear or damage prior to reinstalling the plungers.
9.
Inspect each ring of packing brass for excessive wear and scoring.
10. Remove the plunger lube fitting above each packing bore and blow air through the lube port to
insure that the lube passage is unobstructed.
11. Each packing bore must be thoroughly cleaned and lightly hand polished with a 220 to 240 grit
emory cloth prior to packing reinstallation.
12. 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.
13. Reinstall each packing nut, screwing it all the way in until tight, place a match mark on the nut and
block, then back it off one half turn.
14. Coat the hard surface area of each plunger with a light oil and insert it into the packing. Using a
block of hardwood and a 6 pound 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 clamp end nears the pony rod face. Carefully align the male boss on the plunger
with the female boss on the pony rod and bump the plunger up tight against the pony rod face.
15. Reinstall each plunger clamp on the plunger from which it was removed. Reinstall the 1/2” socket
head capscrews and tighten them evenly to the proper torque
(refer to drawing package for torque values).
16. Using the SPM
®
packing nut wrench, tighten each packing nut back to the mark.
NOTE:
THE PACKING NUT WILL NEED TO BE RETIGHTENED ONLY ONCE AFTER THE PUMP IS
REASSEMBLED AND RAN UNDER PRESSURE FOR A FEW REVOLUTIONS. AFTER THAT, THE
PACKING IS COMPLETELY SELF-ADJUSTING.
17. Reinstall the packing lube fitting above each stuffing box.
18. Reinstall the suction covers as outlined earlier in “To Remove Valves and Seats”.
