Xylem P81547D Series 90 In-Line Centrifugal Pump - Manual (Page 22)

NOTICE:
These seal assemblies consist of a stationary seal insert assembly and a rotating seal
assembly. Each of these components must be replaced when you replace the
mechanical seal. Never replace individual components separately.
5. Remove the ring collar and remaining seal components from the shaft.
6. Use a clean, lint free rag in order to remove any debris that has accumulated in the seal
recess.
Pre-assembly inspections
Guidelines
Before you assemble the pump parts, make sure you follow these guidelines:
• Inspect the pump parts according to the information in these pre-assembly topics
before you reassemble your pump. Replace any part that does not meet the required
criteria.
• Make sure that the parts are clean. Clean the pump parts in solvent in order to remove
oil, grease, and dirt.
NOTICE: Protect machined surfaces while you clean the parts. Failure to do so may
result in equipment damage.
Replacement guidelines
Impeller replacement
This table shows the criteria for replacing the impeller:
Impeller parts When to replace
Impeller vanes • When grooved deeper than 1/16 in. (1.6 mm), or
• When worn evenly more than 1/32 in. (0.8 mm)
Vane edges When you see cracks, pitting, or corrosion damage
Gaskets, O-rings, and seats replacement
• Replace all gaskets and O-rings at each overhaul and disassembly.
• Inspect the seats. They must be smooth and free of physical defects.
• Replace parts if the seats are defective.
Reassembly
Reassemble the seal assembly
WARNING:
After you disassemble a gasket joint, always use a new gasket upon reassembly. Never
reuse old gaskets. Failure to follow these instructions can result in serious personal injury,
death, and/or property damage.
1. Install the seal insert:
Maintenance
Series 90 Installation, Operation, and Maintenance Manual 21