Figure 4-7. Replacing Impeller, Shaft Seal, and Shaft Adapter

4-12. REPLACE/INSPECT IMPELLER, SHAFT SEAL, AND SHAFT ADAPTER

TM-10-4320-309-14 Pump Unit Centrifugal Self-Priming 125 GPM Class 3 Diesel-Driven Army (NSN 4320-01-247-7127) Marine Corps (NSN 4320-01-313-9442) Manual
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TM 10-4320-309-14 TM 4320-14/1 Figure 4-7. Replacing Impeller, Shaft Seal, and Shaft Adapter NOTE When replacing seal, also replace volute O-ring (refer to item 2, Figure 4-6), wear plate O-ring (8, Figure 4-7), and four self-sealing screws (10). c. Install stationary rubber seat (9A) into pump casing cavity. d. Install new shaft seal (9) onto shaft adapter (12). e. If a new impeller and/or wear plate is installed or if the impeller clearance is to be changed, determine the shim thickness required to obtain a clearance of 0.010 to 0.015 inch (0.254 to 0.381 mm) by the following procedure: (1) Screw impeller (3) dockwise onto shaft adapter (12) without shims (4 and 5). Be sure that the impeller is seated firmly against the shaft shoulder. Secure the impeller with teflon washer (2) and hex bolt (1). 4-21

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