Hale MBP Booster - Manual (Page 73)

❑ Preventive Maintenance
72 Silencer Series Booster Pump, p/n: 029-0020-83-0
7. Removing the impeller may disturb the mechanical seal. A new seal must be
installed.
Inspection – Clearance Rings
(See Figure 6-6: “Clearance Ring ID Measurement.”)
Inspect both clearance ring
IDs for signs of wear.
Using a caliper, measure
the inside diameter of each
ring in several places.
If the nominal dimension
does not fall within the
acceptable range speci-
fied below, the clearance
ring must be replaced.
❑ Maximum Inside
Diameter -
APS -............. 4.749” (121.7mm)
MBP - ............ 5.650” (143.5mm)
Installation Notes – Clearance Rings
To install, follow the preceding steps in the reverse order while reviewing the
preceding sections “Before You Begin...” on pape 63 and “Cleaning and
Inspection Guidelines” on pape 65 to ensure a thorough installation.
Inspection – Impeller
(See Figure 6-7: “Impeller OD Mea-
surement.”)
Inspect the impeller ring OD, on both
sides (front and back) for signs of
wear. Measure the OD diameters in
several places, using a caliper.
If the nominal dimension does not
fall within the specified acceptable
range the clearance ring must be
replaced.
Figure 6-6: Clearance Ring ID Measurement
Figure 6-7: Impeller OD Measurement