Xylem P2000799B Series e-90 Close-Coupled In-Line Centrifugal Pumps - Manual (Page 19)

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.
4. Grab the OD of the seal head assembly and remove. Remove the four capscrews that
hold the bracket to the motor and remove the bracket. Push the cup mounted seal
seat out of the bracket with a small screwdriver.
5. Clean the motor shaft and bracket recess with a clean lint free cloth.
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
Impeller eye When worn or grooved more than 1/16 in.(1.6 mm)
Gaskets, O-rings, and seal 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 seal faces or elastomer are damaged.
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. Lubricate the OD of the cup mounted seal seat with soapy water or P80 Rubber
Lubricant and push into the bracket.
2. Install the bracket onto the motor.
3. Check that the seal faces are clean. Lubricate the ID of the seal head assembly with
soapy water or P80 and push onto the motor shaft.
The seal head assembly is a unitized design and should not be disassembled.
Maintenance
Series e-90 Close-Coupled In-Line Centrifugal Pumps Installation, Operation, and Maintenance Manual 17