Goulds Pumps NM 3196 i-FRAME - IOM - Manual (Page 78)

Impeller parts When to replace
Vane edges When you see cracks, pitting, or corrosion damage
Impeller areas to inspect
101
a
b
c
c
Figure 20: Areas to inspect for wear on the 3196 impeller.
Frame adapter check and replacement
• Replace the frame adapter if it has cracks or excessive corrosion damage.
• Make sure the gasket surface is clean.
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.
In order to repair worn seats, skin cut them in a lathe while you maintain dimensional relationships
with other surfaces.
• Replace parts if the seats are defective.
Shaft and sleeve replacement guidelines
Two types of sleeves
The 3198 is offered with either a metallic sleeve that uses the standard 3196 shaft or a Teflon sleeve. The
Teflon sleeve requires a special shaft and a different inboard labyrinth oil seal.
Shaft measurements check
Replace the shaft (122) if any measurements exceed acceptable values. See Bearing fits and tolerances.
122
Straightness check
Replace the shaft (122) if runout exceeds the values in this table:
Table 12: Shaft runout tolerances for sleeve fit and coupling fit
Sleeve fit in inches
(millimeters)
Coupling fit in inches
(millimeters)
With sleeve 0.001 (0.025) 0.001 (0.025)
Without sleeve 0.002 (0.051) 0.001 (0.025)
Maintenance
76 Model NM 3196 i-FRAME Installation, Operation, and Maintenance Manual