3 Preparation for operation
3.1 Bearings
The bearings are located in and are part of the motor. Refer to separate motor instructions. There are no
bearings in the pump.
3.2 Stuffing box
These pumps are furnished with packed stuffing box. In the box of fittings accompanying the pump will
be found the stuffing box packing.
When installing the packing, twist the rings sideways just enough to get them around the shaft.
Do not attempt to pull rings straight out to get them over shaft.
Figure 4: Stuffing box packing
1.
Slide the Lantern ring (105) out and away from the stuffing box. (See Sectional assembly parts
and interchangeability chart). Insert three rings of packing, staggering the joints. The Lantern ring
should then be inserted in the stuffing box. When it is in its proper position, it will be directly op-
posite the sealing inlet connection.
2.
After the Lantern ring is in place, insert two more rings of packing, staggering the joints. One ex-
tra ring is furnished in each set of packing. The extra ring may be added as required.
3.
Place one gland half in lower position in stuffing box. Slide cupped washers over studs and on
the bosses of the gland to hold gland halves together.
4.
Place the two gland nuts on the studs and draw up evenly but not tight.
3.3 Connection of sealing liquid or grease lubricator
If the stuffing box is above atmospheric pressure, and the pumpage is clean, normal gland leakage of
40-60 drops per minute is usually sufficient to lubricate and cool the packing, and sealing liquid is not
required.
Sealing liquid or grease lubricator is required:
1.
When abrasive particles in the pumpage could score the shaft.
2.
Stuffing box below atmospheric pressure (pump running with suction lift or suction source under
vacuum). Under these conditions, the packing will not be cooled and lubricated, and air will be
drawn into the pump.
Sealing liquid may be supplied by recirculating pumpage to the Lantern ring through a line from the cas-
ing to 1/4" pipe tap connection (3/8" on Group "L") in the stuffing box. The other connection is plugged. If
the liquid is abrasive, an outside source of clean compatible liquid must be used at a pressure 20 to 40
psi above suction pressure.
A grease lubricator is supplied when the use of recirculating pumpage or of outside sealing liquid is not
desired. The grease should be compatible with, and insoluble in, the pumpage.
3 Preparation for operation
3655 Installation, Operation and Maintenance Instructions
15
