REPLACE DIFFUSER, IMPELLER, SHAFT SEAL, BACKHEAD AND STUB SHAFT (Continued)

TM-10-4320-310-14 Pump Unit Flammable Liquid Centrifugal Self-Priming 2-Inch 100 GPM Diesel Engine Driven NSN 4320-01-263-3604 Manual
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TM 10-4320-310-14 4-14. REPLACE DIFFUSER, IMPELLER, SHAFT SEAL, BACKHEAD AND STUB SHAFT (Continued) NOTE If the same Impeller assembly (4) and backhead (14) are reassembled and no clearance change was required, make sure the same thickness of shims (9) Is used. 5 If a new impeller assembly (4) or backhead (14) is to be installed, or if the impeller assembly clearance is to be changed, determine shim (9) thickness required to obtain a clearance of 1/16 i 1132 inch (1.59 ± 0.79mm) between the impeller assembly and backhead as follows: a. Without using shims (9), press impeller assembly (4) firmly onto stub shaft (7) and rotate impeller assembly. If no rubbing is heard or felt between impeller assembly (4) and backhead (14), no shims (9) are required. b. If rubbing occurs, remove the impeller assembly (4), add a few shim laminations, press impeller assembly firmly onto stub shaft (7) and again rotate impeller assembly. b. Repeat steps a. and b. until clearance between impeller assembly (4) and backhead (14) just occurs. c. Then remove impeller assembly (4) and remove installed shims (9). Install key (8) into stub shaft (7) keyway and reinstall removed shims plus an additionall/16 inch (1.59 mm) thickness of shims (9). 6 Install impeller assembly (4) and secure with impeller washer (6) and hexagon head cap screw (5). Impeller washer beveled face is to be oriented toward the screw head. Torque hexagon head cap screw to 80 inch- pounds. 7 Install diffuser assembly (2) in pump housing assembly (3) engaging spring pin (1) with slot in pump housing assembly. 4-16

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