8.1.3 INSPECTION AND PARTS REPLACEMENT GUIDELINES
1.
Impeller -- Replace if impeller shows excessive erosion, corrosion, extreme wear or vane break-
age. Hubs must be in good condition. Reduction in hydraulic performance may be caused by ex-
cessive impeller wear, especially along the suction liner mating surface. Replace if impeller ad-
justment is gone.
2.
Suction Liner -- Replace if impeller mating surface is worn flush.
3.
Shaft Sleeve -- Sleeve surface and throttle bushing must be smooth. If either are badly grooved
or cut it must be replaced.
4.
Casing - Suction Cover -- Replace if worn.
5.
Shaft -- Check for runout (.006" max.) to see that shaft has not been bent. Bearing seats and oil
seal area must be smooth and free of scratches or grooves. Shaft threads must be in good condi-
tion. Replace if necessary.
6.
Bearings -- Replace if worn, loose, or rough and noisy when rotated.
7.
Oil Seals, 0-Rings, and Gaskets -- Replace.
8.
General -- All parts must be clean before assembly. All burrs should be removed.
NOTICE:
STANDARD BEARING MANUFACTURER FITS AND TOLERANCE DIMENSIONS ARE USED
IN THE MANUFACTURE OF SPD VERTICAL PUMPS.
NOTICE:
Do not apply heat to hub or nose of threaded impeller. Danger of explosion.
8.1.4 Reassembly of bearing housing and shaft assembly
1.
Clean shaft (122) thoroughly, checking for nicks or worn areas. Refer to Fig. 8.
2.
Press outboard seal (332) into outboard end cover (109), positioning the seal so that the lip points
upward when installed with the pump. Press inboard seal (333) into frame (228) with the lip pointing
downward and secure with capscrews (370P).
3.
Heat outboard bearings evenly using an oven, hot clean oil bath or other approved method. The
use of a torch is not recommended. Heat to 230 to 250°F. Slide each bearing onto the shaft so that
the wide side of the outer rings are together. Hold each bearing inner ring down toward the shaft
shoulder. Allow the bearings to cool. Place a sleeve over the shaft and drive both inner rings togeth-
er toward the shaft shoulder.
4.
Position outboard bearing locknut (136) and lockwasher (382) against the bearing shoulder and
tighten firmly only after the bearings are cool. Bend "tang" of lockwasher into slot in locknut after the
nut has been tightened.
5.
Hand pack outboard bearing with recommended grease (see
a small amount of grease above the bearing to insure sufficient lubrication. Bearing cavity should be
half filled with grease and then rotated to distribute
6.
Insert bearing housing (134A) over the impeller end of shaft and pull over outboard bearing. Attach
end cover (109) with o-ring (496). Tighten bolts evenly so outboard bearing seats proper1y. A gap of
approximately .06in. should exist between the end cover flange and the bearing housing. This gap
assures the bearing is tight into the bearing housing.
7.
Press inboard bearing (168C) onto shaft until inner race seats onto shaft shoulder.
8.
Hand pack inboard bearing fully with recommended grease (see
Mound a small amount of grease above bearing to insure sufficient lubrication.
8.1.5 Pump reassembly -- vertical bottom suction - VJC
1.
Install o-ring (496A) onto bearing housing (134A).
8.1 Disassembly and Reassembly
Model VJC Installation, Operation, and Maintenance Manual
29
Summary of Contents for VJC
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