JETStream 4200 series - Page 36

Operation Manual
28
13. Pull each stufng box from the pump case
(Figure 29).
14. Clean the stufng box bore thoroughly and
apply petroleum jelly or Anti-Seize to the
bores.
15. Install the new stufng boxes into the pump
case. Orient the stufng boxes so the at face
on the outer diameter matches the at face in
each case bore.
16. Extend the plunger from each stufng box until
it mates with the opposing crosshead pony
rods. Install the plunger coupling (Figure 30)
on each plunger and secure with the two bolts.
Tighten the bolts to 20 ft.-lb.(27 N·m).
17. Ensure the gland nuts are tight. Use the pump
wrench and a 5 lb. (2 kg) hammer to tighten
the gland nuts to approximately 250 ft.-lb.(338
N·m) (Figure 31). Hit the wrench about three
times using moderate power. This should sup-
ply sufcient torque on the nut.
ATTENTION
Apply petroleum jelly or Anti-Seize to each
stufng box bore when installing stufng boxes
to help prevent corrosion and extend pump life.
Figure 29: Stufng Box Removal.
Figure 30: Plunger Coupling Installation.
Plunger Coupling
Figure 31: Tightening the Gland Nuts.