Xylem G&L A-C 8300 Series, Instruction Manual

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CAUTION:
Do not reuse ball bearings.
9. Remove the mechanical seal head form the pump shaft.
NOTE: To ease the removal of the mechanical seal heads, you may want to use 2 allen
wrenches as hooks or form hooks from wire.
10.Drive the lip-seals, the mechanical seal seats, from each of the gland plates by tapping
on them from the rear.
11.Remove the O-rings from each of the gland plates.
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 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.
6.7.2 Shaft inspection
Inspection criteria
Inspect the shaft according to this criteria:
• Thoroughly clean the shaft .
• 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 Maintenance
G&L Pumps Series A-C 8300 Base Mounted Centrifugal Pump INSTRUCTION MANUAL 33