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TM 5-4320-308-13
3-20. REPLACE VOLUTE, IMPELLER, WEAR PLATE, SHAFT SEAL, AND ADAPTER SHAFT (Continued)
INSTALLATION:
1
Install new shaft seal (15) on adapter shaft (6). Install
key (16).
2.
Install adapter shaft with shaft seal into pump case
assembly (4).
3.
Install new packing (14) in pump case assembly (4).
4.
Install wear plate (13) and screws (12). Tighten
screws securely.
NOTE
If the same impeller and wear plate are reassembled and no clearance change is indicated, make
sure that the same thickness of shims is used.
5
If a new impeller and/or wear plate is to be installed, or if the impeller clearance is to be changed, determine the
shim thickness required to obtain a clearance of 0. 010 to 0. 020 inch (0. 254 to 0. 508 mm) between the
impeller and wear plate as follows:
a.
Screw impeller (9) clockwise on shaft (6) without shims. Be sure that it is seated firmly against the shaft
shoulder. Secure impeller with lock washer (8) and screw (7).
b.
Measure from the face of the impeller (9) to the face of the wear plate (13) using a feeler gage.
c.
Select shims (10 and 11) to equal the dimension obtained less 0.010 to 0.020 inch (0.254 to 0.508 mm) for
clearance.
6
Install impeller (9), lock washer (8), and screw (7). Tighten screw securely.
7
Install new packing (5) on. volute (3). Install volute on pump case assembly (4).
8
Install washers (2) and nuts (1). Tighten nuts securely.
3-45
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