Bell & Gossett P82893D Series 60 In-Line Centrifugal Pumps - Manual (Page 27)

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 seatsreplacement
• 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
Reinstall the seal
1. Clean the shaft sleeve and seal seat recess.
You can use crocus cloth in order to polish the sleeve. Do not scratch or gouge the
recess or sleeve.
2. Install the seat gasket and seat into the seal recess in the faceplate or coverplate.
On ceramic seats there are two dimples located on one of the faces. The dimples
indicate the side of the seat that rests against the seat gasket. Tungsten carbide faces
can be inserted with either face against the gasket.
3. Lubricate the seal boot with soapy water and then slide the complete seal head
(carbon ring, seal boot, driver, and compression ring) over the shaft.
Do not attempt to install the seal head by placing the components on the shaft
individually.
4. Slide the seal head on until the carbon ring contacts the seat. Make sure that the
protrusions in the driver remain engaged in the notches in the carbon.
5. Use the flat face of a screwdriver and firmly press on the top of the edge of the
compression ring at several locations in order to make sure that the seal head sits flat
against the seat.
6. Place the spring and spring retainer on top of the seal head.
Maintenance
Series 60 Installation, Operation, and Maintenance Manual 25