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Primer Suction Pipe
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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FIRE PUMP
TM 5-4210-220-34 2-13. FIRE PUMP - Continued 2-13.2 Wearing Ring. This task covers Repair TOOLS Batteries Disconnected Shop Equipment, Automotive (see TM 5-4210-220-12) Maintenance and Repair, Heat Shields Removed NSN 4910-00-754-0705 (see TM 5-4210-220-12) Pump Suction Pipe Removed EQUIPMENT CONDITION (see TM 5-4210-220-12) Water Tank Drained (see TM 5-4210-220-12) Main Engine Shutdown MATERIALS/PARTS (see TM 5-4210-220-12) 21, Appendix B Petroleum Jelly APU Shutdown (see TM 5-4210-220-12) UFP 5351/1 Suction Tube Gasket REPAIR (1) Remove wearing ring (2) using two M10 x 1.5 flat-ended capscrews.  Thread the two flat-ended capscrews into the two tapped holes (4). (2) Tighten two capscrews evenly and remove wearing ring (2) from volute body (1). (3) Remove and discard gasket (3). (4) Examine   volute   body   (1)   and   wearing   ring   (2)   for   cracks,   corrosion,   or   warped   flanges.      Replace   as necessary. (5) Measure   the   internal   diameter   (A)   of   the wearing    ring    (2)    in    several    places.        If dimension   (A)   exceeds   7.025   in.   (178.43 mm)  at  any  of  several  points,  the  wearing ring must be replaced.  If the wearing ring is to be replaced,  it  is  recommended  that  the impeller wearing diameter is also measured.  See para. 2-13.4 for procedure. (6) To install wearing ring (2), apply a continuous bead of petroleum jelly (item 21, Appendix  B)  to  both  sides  of  new  gasket (3). (7) Aline   mounting   holes   in   gasket   (3)   with holes  in  wearing  ring  (2).    Allow  gasket  to stick to wearing ring. (8) Attach wearing ring (2) to volute body (1) using eight capscrews (M12 x 1.75 x 25 mm L). Tighten capscrews to 90 ft lb (122 Nm).  Make sure wearing ring is fitted with its sleeve towards the volute body (1). (9) Measure radial clearance between the impeller and wearing ring.  The minimum clearance allowed is .006 in. (0.15 mm). (10)  Remove capscrews and replace suction pipe (see TM 5-4210-220-12). (11)  After repairs have been made, test fire pump as detailed in para.  2-13.14. 2-95

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