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IJ PUMP OPERATION AND MAINTENANCE MANUAL

BO2660-01 6-20

extensive examination is required, the inspection item is cross referenced to a detailed procedure.
Inspect:

1. Shaft for scratches, nicks, burrs, and distortion; absolutely smooth surfaces and a straight

shaft are required (see CHECKING SHAFT STRAIGHTNESS below).

2. All internal castings (intermediate covers, impellers, etc) for erosion and other damage such

as nicks, gouges and cracks must be corrected before final assembly.

3. Dowels for distortion, cracks, burrs, and proper fit; dowel holes for damage and elliptic

shape.

4. Abutting faces and running surfaces of impeller hubs and skirts, shaft sleeves, pressure

reducing sleeve, wearing rings, bushings, all internal castings, for nicks, burrs, scratches and
scouring-concentric and absolutely smooth surfaces are required.

5. Pressure reducing sleeve/bushing, wearing rings, and bushings for excessive wear (see

CHECKING RUNNING CLEARANCES below) .

6. Impeller bores and pressure reducing sleeve bore for correct fit with shaft (see CHECKING

FIT OF IMPELLERS AND BALANCING DRUM WITH SHAFT below).

7. Impeller hub and skirt for roundness by taking micrometer readings of their diameters at 90°

degree intervals. For corrective action, see RENEWING IMPELLER WEARING
SURFACES below.

8. Split rings and shoulder ring for burrs, nicks and gouges.

9. O-ring grooves in shaft sleeve for nicks, burrs, and scratches-absolutely smooth surfaces are

required.

10. Rotating assembly for nominal concentricity (see CHECKING CONCENTRICITY OF

ROTATING ASSEMBLY below).

6.5.2.6.2 Checking Running Clearances

Actual running clearance is determined by measuring the inside diameter of the stationary part and
the outside diameter of the rotating part and taking the difference. Measurements should be taken
with a micrometer and each part should be checked for trueness or roundness by taking diametrical
readings 90° degrees apart. To where replacement of a part is advisable, compare the actual clearance
with the design clearance that is listed under OPERATING SPECIFICATIONS, then, consider the
wear (that is, actual clearance minus design clearance) with respect to the general statement under
OPERATING SPECIFICATIONS concerning restoration of mechanical and hydraulic efficiency and
decide whether to restore design clearance. Before final assembly, the trueness and the running
clearance of the following should be checked:

1. Pressure reducing sleeve and bushing; replace parts if running clearance exceeds the

recommendation under OPERATING SPECIFICATIONS or parts do not run true. Since the
parts are designed with a specific area for balancing hydraulic forces, reworking to restore
clearance or trueness is not recommended.

2. Each bushing (29) and impeller hub (34), or impeller wearing ring when installed; restore

running clearance that is recommended under OPERATING SPECIFICATIONS and trueness
according to instructions under RENEWING IMPELLER WEARING SURFACES or
REPLACING IMPELLER WEARING RINGS and REPLACING BUSHINGS below.

3. Each stationary wearing ring (26, or 32) and impeller skirt or impeller wearing ring, when

installed; restore running clearance that is recommended under OPERATING