Hale SMR - Manual (Page 89)

Stainless Max Series Pumps 6-11
Maintenance and Repair
3. Remove the twelve M12 bolts and hardware securing the suction
cover plate (with O-ring) to the volute (pump body).
4. Insert three jacking screws (M12) into the tapped holes adjacent
to the bolt-down holes. Evenly tighten the jacking screws until
the suction cover plate is free (removable by hand).
5. Remove the tachometer sender, if equipped.
6. While holding the impeller with a strap wrench, remove the
impeller nut, then the lock washer (pair). Note orientation of the
lock washers for reassembly.
Note: Tap the pump shaft at the threads, using a dead blow hammer,
to free the impeller from the pump shaft. It may be necessary to use a
special tool, Hale p/n: 60275/04, to remove the impeller from the pump
shaft.
CAUTION!
DO NOT STRIKE THE IMPELLER. IRREPARABLE DAMAGE COULD
RESULT.
7. Slide the impeller from the pump shaft, then remove the impeller
shaft key and set safely aside.
Inspection
See Figures 6-3: “Critical Dimensions” on page 6-2, and Figure 6-
6: “Impeller Measurement.” Also see Table 6-7: “Impeller Specifi-
cations” on page 6-12.
Inspect the clearance
ring ID for signs of
wear. Measure the
front (ID) and the
rear (OD) diameters
of the impeller in
several places, using
a digital caliper.
If the measured
diameter is equal to
or less than the worn
range in Table 6-7, a
new impeller must be
installed.
Figure 6-6: Impeller Measurements