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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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General Inspection Instructions - Continued - TM-5-4210-220-12_206
TM 5-4210-220-12 4-9.  GENERAL MAINTENANCE PROCEDURES - Continued m. Rubber Parts Do not clean preformed packings or other rubber parts in solvent.  These parts should be wiped with a clean, dry, lint-free cloth. n. Electrical Components Electrical components (e g coils, switches) which use insulating materials shall not be soaked or sprayed with cleaning solutions.  Remove dirt with a clean, dry, lint-free cloth.  If necessary, moisten cloth with dry cleaning solvent (item 10, Appendix E). p. Complex Components Components that consist of a fabrication with passages and cavities should be checked thoroughly after cleaning.   A thin flexible wire should be run through all passages to ensure they are not blocked individual passages may be cleaned using a pressure spray gun and dry cleaning solvent (item 10, Appendix E). 4-9.3  General Inspection Instructions. a. Sealing Surfaces Check all contact surfaces of gaskets, packings, or seals.  Ensure there are no nicks, burrs, or scratches.  These might damage new seals during assembly if any defect is found, correct it as outlined in para. 4-9.4 following. b. Ball and Roller Bearings Check bearings for pitted balls, races, or separator.  Bearings shall be rejected if any of the following are seen in the race load area. (1) Cuts or grooves parallel to ball or roller rotation (2) Fatigue pits (not minor machine marks or scratches) (3) Cracks found during magnetic particle inspection (4) Serious abrasion of balls or rollers (5) Serious discoloration of any part of the bearing c. Drain Plug When removing drain plugs from transmission, engine, or axles, inspect the plug.  A build-up of grit and/or fine metal particles may indicate part failure.  A few fine particles are normal. d. Tubing and Hoses Check all hose surfaces for broken or frayed fabric.  Check for breaks or weak points due to kinking or rubbing inspect metal tube lines for kinks or excessive corrosion.  Inspect fitting threads or clamps for damage.  Replace any faulty part.  After assembly, check all disturbed joints for leaks. 4-61

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