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Displacement Pump Service
For Pumps 246938, 246940, 246941 and 246942 only
Servicing the Throat Packings
NOTE: The throat packings are available as a preas-
sembled, pre–lubricated kit. For series B pumps, order
Part No. 241782. For series A pumps order Part No.
237905. Parts included in these kits are marked with
an asterisk, for example (3*). Part No. 237905 includes
items 3, 5 (qty: 1), 6, and 47.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page12.
1. Relieve the pressure.
2. See Fig. 17. Unscrew the packing nut (2) using a
pipe wrench. Remove the o-ring (6) and washer
(47) from the bottom of the packing housing (3) or
from the outlet housing (9).
3. Place the flats of the packing nut (2) in a vise.
Unscrew the packing housing (3) and discard it
and the packings. Remove the washer (46), seal
(5), and backup washer (45) from the packing nut.
4. The throat repair kit is preassembled. Screw the kit
into the packing nut (2), making sure that the
backup washer (45*), seal (5*), and washer (46*)
are properly positioned on top of the packing
housing (3*), with the lips of the seal facing down.
Torque the packing housing (3*) to 97–106 N.m
(71–78 ft-lb). See Fig. 17.
5. Check that the washer (47*) and o-ring (6*) are
properly installed on the bottom of the packing
housing (3*).
6. Screw the packing nut (2) into the outlet housing
(9). Torque to 190–217 N.m (140–160 ft-lb).
Fig. 17
1
2
2
3*
6*
9
Torque to 97–106 N.m (71–78 ft-lb).
Torque to 190–217 N.m (140–160 ft-lb).
1
2
3
Lips of u-cup packing must face down.
3
5*
47*
46*
3
5*
45*
5142C