Product Description
Model 3410 Installation, Operation, and Maintenance Manual
18
• Optional impeller wear rings are available on all pump sizes. The impeller wear rings are
held in position by axial setscrews. Field installation of impeller rings requires a
remachining of the impeller hubs.
• The casing rings remain the same for designs with or without impeller rings.
Shaft
The shaft is a heavy-duty design that minimizes deflection and vibration. The shaft deflection is
a maximum of 0.002 in. (0.051 mm) at the stuffing box face under the worst operating
conditions. The shaft on M, L, and XL group pumps is completely dry with gasket seals
between the impeller hubs and shaft sleeves. The S group does not have a completely dry
shaft. The S group is standard with a 420 stainless steel shaft. The M, L, and XL sizes have an
ANSI 4140 steel shaft standard with an option for 316 stainless steel.
Shaft sleeves
The M, L and XL group pumps have standard shaft sleeves. They are keyed to the shaft at the
impeller and held axially in place using threaded sleeve nuts. The S group pumps are standard
without shaft sleeves, but sleeves are available.
Stuffing box
Non-asbestos stuffing box packing is standard. The stuffing box contains split lantern rings and
renewable stuffing box throat bushings. Tapped openings are provided for water sealing from
either the pump casing or an outside source. Bypass piping is optional. Two-piece, investment
cast, 316 stainless steel, non-quench glands are standard on all 3410 pumps.
Mechanical seals
• Mechanical seals are available as an option on the Model 3410. Oversize stuffing box
bores are standard on pumps with factory-installed mechanical seals. This provides
greater flexibility and an improved operating environment.
• Pumps that are supplied with standard packed boxes can be converted to mechanical
seals in the field. This conversion requires either remachining of the stuffing box to
accommodate the mechanical seal or remachining of the gland to adapt to the existing
stuffing box. If the stuffing box bores are remachined, then all standard Model 3410
mechanical seals and the standard I.D. pilot glands can be used.
• Balanced seals require conversion to stepped sleeves. Most unbalanced mechanical seals
will fit in the standard packed box bores, but this requires remachining the I.D. pilot off the
glands. In this case, the glands must be centered on the shaft or the sleeve using a feeler
gauge.
• Pumps supplied with mechanical seals can also be converted to packed boxes in the field.
A cartridge conversion kit is available and includes a box of fittings plus sleeves to convert
oversize bores to standard packed-box bores.
Bearings
• The Model 3410 is standard with double-row ball thrust bearings and a single-row deep
groove ball bearing at the coupling end. There are only two sizes of bearing housings and
bearings used on the Model 3410 product line. The S and M groups use identical bearings,
as do the L and XL groups. The thrust bearing is held in position with a tapered snap ring
and is locked in the thrust bearing housing to take any unbalanced axial thrust load. The
radial bearing is free to float axially in the bearing housing taking radial loads only.
• Grease lubrication is standard. Oil lubrication is optional and uses the same shaft,
bearings, and bearing housings. Bearing cooling is available with oil lubrication only and is
required for temperatures over 250°F (121°C). The bearing housings are completely
sealed by Inpro VBS bearing isolators.
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