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6 Maintenance
hold the shaft vertically and drop it on a block of wood. The impeller weight should
force both the impeller and sleeve from the shaft.
16.For impellers with replaceable rings, remove the rings (4–004–9) by cutting the rings
with a cold chisel.
For pumps equipped with adjustable rings, refer to Adjustable wear rings instructions.
6.7 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.
6.7.1 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.
6.7.2 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.
34
G&L Pumps Series A-C 9100 Base Mounted Centrifugal Pumps INSTRUCTION MANUAL
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
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