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TM 9-2330-398-24
3-34. 4-INCH PUMP ASSEMBLY REPAIR (continued).
NOTE
Remove wear plate only if excessive wear is evident.
9.
Remove two nuts (21) and lockwashers (22) and wear plate (28) from volute. Discard lockwashers.
10.
Remove eight studs (27) from volute (26).
11.
Remove pipe plug (23) from volute (26).
c. CLEANING AND INSPECTION
1.
Inspect clearance between wear plate and Impeller. If clearance exceeds 0.035 inch, add shims until rubbing just
starts to occur when impeller and wear plate are Installed. Remove enough shims to move the impeller away from
the wear plate to a distance of 0.015 inch.
2.
Rotate pump by hand to make sure Impeller is not binding or scraping.
3.
Remove minor nicks on edges of impeller vanes with a fine finishing stone.
5.
After replacement of impeller, wear plate, or impeller shaft, check for clearance between the back of the impeller
and the seal plate. If the impeller scrapes when the seal plate is installed, add another gasket of sufficient
thickness between the seal plate and pump casting.
6.
Inspect the mating surfaces of the seals for wear, scoring, grooves, or other damage that can cause leakage. If
any of the seal parts are worn, replace seal. Never mix old and new parts of seals.
7.
Inspect the impeller shaft for nicks, scratches, scoring, or other damage. Replace the shaft if damaged.
8.
Rotate bearings by hand and check for binding or wear. Replace bearings if wear is found. If the shaft is worn so
the bearings slip on and off easily, the shaft must be replaced. Replace the housing if the bearings do not fit
snugly into the bearing bore.
d. ASSEMBLY
1.
Install pipe plug (23) in volute (26).
2.
Install eight studs (27) in volute (26).
3.
Install wear plate (28) to volute (26) with two new lockwashers (22) and nuts (21).
4.
Install spacer (39), bearings (38 and 42), and snap ring (48) to impeller shaft (41).
5.
Install new seal (45) in bearing cup (44).
6.
Install new seal (37) in intermediate housing (35).
7.
Install spacer (39), bearings (38 and 42), and impeller shaft (41) in intermediate housing (35) as an assembly.
8.
Install pump coupling (16) and key (47) to impeller shaft (41).
9.
Install new gasket (43), bearing cap (44), new lockwasher (22), and four screws (46) to intermediate housing (35).
3-106
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