4-14. REPLACE DIFFUSER, IMPELLER, SHAFT SEAL, BACKHEAD AND STUB SHAFT

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 10320-310-14 4-14. REPLACE DIFFUSER, IMPELLER, SHAFT SEAL, BACKHEAD AND STUB SHAFT This task covers: a. Removal c. Inspection b. Cleaning d. Installation INITIAL SETUP Tools Equipment Condition Tool Kit, General Mechanics Automotive Para Equipment Condition (Item 1, Appendix B) Puller (Item 2, Appendix B) 4-13 Quick disconnect coupling halves Torque Wrench (Item 2, Appendix B) and pump housing assembly removed. Materials/Parts General Safety Instructions Dry cleaning solvent (Item 10, Appendix E) Silicone (Item 2, Appendix E) Well-ventilated area required during cleaning. Lockwashers, preformed packing, shims REMOVAL: 1 Disengage diffuser assembly (2) from impeller (4). Remove spring pin (1) only if damaged. 2 Hold impeller assembly (4) stationary and remove hexagon head cap screw (5) and impeller washer (6). Unless impeller is corroded, it can be slipped off stub shaft (7) without force. Remove impeller assembly. Pull key (8) from stub shaft (7). 3 Remove shims (9) if present, shaft seal assembly (10) parts noting their orientation and preformed packing (11); discard preformed packing (11). 4-14

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