308793 25
Service
Replacing the Throat Packings Without
Disconnecting the Displacement Pump
NOTE: To replace the throat packings as part of a
complete servicing of the displacement pump, refer to
page 27.
NOTE: Throat packing kits are available. Refer to page
45 to order. Parts supplied in the throat packing kit are
marked with a symbol, for example (19{). For the best
results, use all the parts in the kit.
1. Flush the pump, if possible.
2. Stop the pump at the middle of its stroke.
3. Shut off the air or hydraulic supply.
4. Remove the cotter pin (F). See Fig. 7 for Senator
and Bulldog Pumps, and Fig. 10 for President and
Viscount Pumps.
5. Cycle the pump slowly to the bottom of its stroke.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 15.
6. Relieve the pressure.
7. Uncouple the displacement pump as follows:
D Senator and Bulldog Pumps: See Fig. 7.
Unscrew the coupling nut (A) from the motor
shaft. Unscrew the coupling (G) from the
piston rod (H). Set the coupling and coupling
nut aside.
D President and Viscount Pumps: See Figs. 9
and 10. Unscrew the coupling nut (K) from the
piston rod (H). Unscrew the coupling rod (G)
from the air motor and set it aside.
8. See Fig. 11. Loosen and remove the packing nut
(21).
9. Stainless Steel Pumps Only: Loosen and remove
the throat cartridge (38). Remove the r
o-ring (39).
NOTE: To convert carbon steel pumps to the throat
cartridge design used on stainless steel pumps, order
Conversion Kit 239869.
10. Remove the glands (19, 26) and packings (20, 25).
11. Lubricate the throat packings and glands. Install
one male gland (19{), then five v-packings with the
lips facing down: one UHMWPE (20{), one leather
(25{), UHMWPE, leather, UHMWPE. Install the
female gland (26{). Install three v-packings with
the lips facing up: UHMWPE, leather, UHMWPE.
Install the other male gland (19{). Install the
packing nut (21) finger-tight.
NOTE: Model 239859, 239860, 240612, and 240613
displacement pumps use 8 v-packings (20) in
the throat, instead of 5 UHMWPE (20) and 3 leather
(25) as on all other models.
12. Stainless Steel Pumps Only: Install the o-ring
(39{) on the throat cartridge (38), then screw the
throat cartridge into the upper pump housing (1).
Torque the throat cartridge to 135 NSm (100 ft-lb).
13. Torque the packing nut (21) to 34–40 NSm (25–30
ft-lb).
14. Recouple the displacement pump as follows:
D Senator and Bulldog Pumps: See Fig. 7. Make
sure the coupling nut (A) and o-ring (J) are in
place on the coupling (G). Screw the coupling
onto the piston rod (H). Screw the coupling nut
(A) onto the motor shaft and torque to
102–109 NSm (75–80 ft-lb).
D President and Viscount Pumps: See Fig. 10.
Screw the coupling (G) into the motor shaft
until the pin holes align. Screw the coupling
nut (K) onto the piston rod (H) and torque to
102–109 NSm (75–80 ft-lb).
15. Reinstall the pin (F). If necessary, reconnect the
air or hydraulic supply and move the pump to the
middle of its stroke. Install the pin (F) in the sec-
ond hole from the end of the coupling for Presi-
dent pumps, and in the first hole from the end of
the coupling for Viscount pumps.
