Bearings
The thrust bearing is a grease-lubed, double-row, angular contact ball bearing. The bearing is shouldered
and locked to the shaft and housing. This enables the bearing to carry all of the thrust loads and some of
the radial load. All fits are precision-machined to industry standards. The steady bearings are press fit
sleeve bearings. Fits are designed for optimum life under all operating conditions.
Seals
This pump has three seals:
Seal type Description
Upper labyrinth seal This seal is used to exclude dirt and water from the thrust bearing.
Lower grease seal This seal is used below the thrust bearing in order to contain the
grease and exclude any possible contamination.
Carbon Teflon
®
casing collar This seal is installed immediately behind the impeller in the casing
in order to minimize recirculation back to the sump and
maximize hydraulic efficiency.
Motor support
Motor supports are cast construction and precision-machined in order to maintain proper alignment
between the motor and pump shaft with minimal shimming. Motor supports are designed for vertical C-
face motors as standard. P-base supports and IEC adapters are available upon request.
Direction of rotation
The shaft rotates clockwise when you look down on the pump shaft.
Nameplate information
Important information for ordering
Every pump has a nameplate that provides information about the pump. The nameplate is located on the
motor support.
When you order spare parts, identify this pump information:
• Model
• Size
• Serial number
• Item numbers of the required parts
Refer to the nameplate on the pump casing for most of the information. See Parts List for item numbers.
Motor support nameplate
Product Description (Continued)
Model 3171 Installation, Operation, and Maintenance Manual 13
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