Shaft – Goulds Pumps 3420 - IOM User Manual
Page 71
To replace the impeller wear rings
1.
Remove the old rings by removing the three set
screws (320) and pulling the ring (142) off of the
impeller hub.
2.
Clean the impeller hub and press on a new wear ring.
3.
Drill and tap three holes in the ring/hub seam 120
°
apart, offset from the original setscrew holes. Insert
new setscrews (320) and lightly upset the threads.
NOTE: Replacement impeller wear rings are supplied
.020-.030 in. oversized and must be turned to size (see)
after mounting on the impeller. SX and MX size rings
are supplied turned to the finished diameter.
SHAFT
Inspect the shaft (122) for runout to verify the shaft is
straight. See Fig. 53 for proper shaft runout inspection.
Inspect the bearing seats and the impeller seats. Verify
they are the correct size and free from any scratches or
grooves. Bearing fits and tolerances are found in Table 10.
The shaft threads must be in good condition. Inspect the
keyways for burrs or foreign matter. Replace the shaft if
necessary.
3420 IOM 8/09
67
Fig. 50
Fig. 52
Fig. 53
Fig. 51
6