4.3 Adjustment of stuffing box gland
With pump running at rated speed, stuffing box glands can be adjusted. Draw gland nuts up evenly and
only one-sixth of a turn at a time, allowing sufficient time between adjustments for the packing to adjust
itself and the effect on the leakage to be observed. If any sign of heating is evident, shut off the pump
and allow the boxes to cool. Several starts may be necessary before the boxes run cool. Do not back off
the gland nuts on a hot box as this will usually result in liquid leaking between the outer edge of the pack-
ing and the stuffing box bore. It must be borne in mind that it takes newly-installed packing
some time to "run in" and that during this period, frequent attention and careful adjustments are necessa-
ry. See Stuffing box for final adjustments of gland.
4.4 Alignment - final
Final alignment can only be accomplished after unit has been run under actual operating conditions for a
sufficient length of time to bring the unit up to operating temperatures.
After this warm-up period has elapsed, stop the unit and immediately disconnect the coupling and check
the alignment.
Follow the alignment procedure as outlined in Alignment - initial, with the exception of Paragraph 6 which
allows for "growth" of the parts due to temperature difference between the driver and the pump. At the
operating temperature, the unit will be in correct horizontal and vertical parallel alignment when a straight
edge rests evenly on both halves of coupling rims at four points 90° apart.
As cautioned in 7, changing alignment in one direction may alter the alignment in another. Check thru
each alignment procedure after making any alignment change.
4.5 Doweling
Doweling is not required on Group "S" and "M" pumps. On these pumps, patented lock washers are fur-
nished which hold the pump and driver feet securely in place.
On Group "L" pumps, the pump and driver should be doweled after installation is complete and the unit is
in correct final alignment. Four #6 taper dowel pins are included in the box of fittings accompanying the
pump. These pins have a taper of ¼" to the foot. The diameter at large end is .341" (approximately
11/32" ) and the recommended drill size is 9/32".
Drill through two diagonally opposite feet of the pump and driver into the bedplate. Use a reamer with a
taper of ¼" to the foot. Ream out the drilled holes so that dowels extend well into the bedplate but project
above the pump and driver feet.
If the operator so desires, the same size pins and method of doweling can be used on Series "S" and "M"
pumps in addition to the patented lock washers.
To determine the group of a particular size pump, see interchangeability list,
4.3 Adjustment of stuffing box gland
26
3316 Installation, Operation and Maintenance Instructions
