Replacement Guidelines; Shaft And Sleeve Inspection; Reassembly; Assemble The Standard Mechanical Seal (80 And 80-F) - Bell and Gossett 80 Series Instruction Manual

6 Maintenance
NOTICE:
Protect machined surfaces while you clean the parts. Failure to do so may result in
equipment damage.

6.3.1 Replacement guidelines

Impeller replacement
This table shows the criteria for replacing the impeller:
Impeller parts
Impeller vanes
Vane edges
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.

6.3.2 Shaft and sleeve inspection

Inspection criteria
Inspect the shaft and sleeve according to this criteria:
• Thoroughly clean the shaft and sleeve.
• Thoroughly clean the coverplate seal cavity.
• Inspect the surface for damage such as pitting, corrosion, nicks, and scratches.
Replace these parts if they are damaged.

6.4 Reassembly

6.4.1 Assemble the standard mechanical seal (80 and 80-F)

1. Lubricate the shaft sleeve and coverplate seal cavity with soapy water.
Do not use a petroleum lubricant.
2. Install a new insert gasket.
3. Install a new seal insert and make sure that the indentation is against the insert gasket.
4. Slide a new rotating seal assembly onto the shaft sleeve.
5. Push the top of the compression ring with a screwdriver until the seal is tight against
the seal insert.
6. Install the seal spring and point the narrow end toward the seal.
20
When to replace
• When grooved deeper than 1/16 in. (1.6 mm), or
• When worn evenly more than 1/32 in. (0.8 mm)
When you see cracks, pitting, or corrosion damage
Series 80 INSTRUCTION MANUAL