Goulds Pumps 3296 EZMAG - IOM - Manual (Page 62)

Maintenance
• Replace the containment shell if there are any grooves in excess of 0.005 in. (0.127 mm).
Magnet inspections
WARNING:
The magnets contained in this unit are extremely powerful. Keep magnetic drive components and
magnetic tools apart from each other by a minimum of 6 ft. (2 m). Serious injury to fingers and hands will
result if you do not follow this precaution.
Driven magnet assembly inspections
Perform these checks on the driven magnet assembly (740A):
• Check that the assembly is free from bulges.
• Check that the assembly is free from pits and scratches that exceed 0.005 in. (0.127 mm)
deep.
• Check that the assembly is free from erosion or corrosion that exceeds 0.005 in. (0.127
mm) deep.
• Check the pump-out vanes for cracks and corrosion.
• Check that the circulation holes are open.
Drive magnet assembly
The magnets are extremely brittle. It is normal to have chips that amount to 10% of the magnet
surface per MMPA Standard No. 0100-90.
Perform these checks on the drive magnet assembly (740B):
• Check that the magnets are free of major cracks and extent over 50% of the surface and
are free of imperfections that create loose particles.
• Replace the magnets if the magnets and drive magnet carrier were exposed to any
pumped fluid.
• Check the drive magnet carrier for cracks and replace if any cracks are found.
• Check the drive magnet carrier hub OD is free from grooves and scratches that are greater
than 0.005 in. (0.127 mm).
• Check the magnets for proper bonding to the metal carrier.
Bearing-frame inspection
Checklist
Check the bearing frame for these conditions:
• Visually inspect the bearing frame and frame foot for cracks.
• Check the inside surfaces of the frame for rust, scale, or debris. Remove all loose and
foreign material.
• Make sure that all lubrication passages are clear.
• Inspect the inboard-bearing bores.
The maximum acceptable bore is 2.836 in. (7.203 cm) for S-group pumps and 3.544 in.
(9.002 cm) for M-group pumps.
• Inspect the labyrinth seal O-rings for cuts and cracks.
• Inspect the ball bearings for containment and damage.
• Make sure the gasket surfaces are clean.
• Visually inspect the bearing end cover for cracks and pits.
Bearings inspection
Condition of bearings
Do not reuse bearings. The condition of the bearings provides useful information on operating
conditions in the bearing frame.
60 Model 3296 EZMAG Installation, Operation, and Maintenance Manual