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REPAIR (cont) - TM-5-4210-220-34_217
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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REPAIR (cont) - TM-5-4210-220-34_219
TM 5-4210-220-34 2-19. ENGINE - Continued (18) Lubricate bearing bores and shaft bearing surfaces with engine oil (item 17, Appendix B). (19) Press bearings (11 and 12) on shaft using J25257 gear and bearing installer.  Press only on the inner races during installation. (20) Support pump body (3) on press bed with cover side down.  Press shaft and bearing assembly in place by applying pressure on the outer race of the large bearing (12). (21) Install bearing retaining ring (13). (22) Inspect water pump driven gear for damaged teeth.  Replace as required. (23) Inspect water pump drive gear or engine for possible related failure.  Refer to General Support Level if repair is necessary to drive gear. (24) Position gear installer J25257 on impeller end of shaft (8).  Press gear (14) on shaft so it is flush with end of shaft. (25) Apply film of engine oil (item 17, Appendix B) to sealing areas of oil seal (10) and shaft (8).  Install seal with spring loaded tip towards bearing in pump housing (3).  Press or tap seal flush with water seal counter-bore using suitable installing sleeve. (26) Apply a light coat of seal retainer (item 26, Appendix B) on outside diameter of water seal (9).  Install seal in the pump body housing (3) with a sleeve large enough to fit around the seal case and resting on the brass lip. Press seal into position. (27) Inspect water pump impeller (7) for erosion and excessive wear. (28) If impeller is reused, the ceramic impeller insert must be replaced.  If new impeller is to be installed proceed to step 36. (29) Bake  impeller  assembly  at  500  deg.    F  (260  deg.    C)  for  one  hour.    Remove  insert  while  adhesive  is  hot. Allow impeller to cool.  Clean the insert area with buffing wheel to remove old adhesive and oxide build up. WARNING Dry  cleaning  solvent  P-D-680  (safety  or  Stoddard’s  solvent)  is  potentially  dangerous.    Avoid  repeated  and prolonged  breathing  of  vapors  and  skin  contact  with  the  liquid.    Do  not  use  near  open  flame,  arcing equipment or other ignition sources.  Always wear eye protection and protective clothing.  The flash point of P-D-680 is 100 to 138 deg.  F (30 to 59 deg.  C). (30) Clean with dry cleaning solvent (item 10, Appendix B). WARNING Death or serious injury could occur if compressed air is directed against the skin.  Do not use compressed air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11 kg/cm2) or less.  When working   with   compressed   air,   always   use   chip   guards   eye   protection   and   other   personal   protection equipment. 2-225

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