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repair (cont) - TM-5-4210-220-34_405
TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
repair (cont) - TM-5-4210-220-34_407
TM 5-4210-220-34 3-8. ENGINE Continued 3-8.3 Blower Continued (37)   Wash all of the blower parts In 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   protective equipment. (38)   Dry all of the blower parts using compressed air. (39)   Examine the bearings for any indications of corrosion or pitting. Lubricate each ball bearing with light engine oil  (Item  17,  Appendix  B).  Then,  while  holding  the  bearing  inner  race  from  turning,  revolve  the  outer  race slowly  by  hand  and  check  for  rough  spots.  The  double-row  ball  bearings  are  pre-loaded  and  have  no  end play. A new bearing will seem to have considerable resistance to motion when revolved by hand. (40)   Check the oil seal rings, carriers, and collars for wear or scoring. If worn excessively, they must be replaced. The current oil seal rings are chrome flashed and the carriers are liquid nitrided. When replacement of an oil seal ring or carrier is necessary, both parts must be replaced together. (41)   Inspect  the  blower  rotor  lobes,  especially  the  sealing  ribs,  for  burrs  or  scoring.  Rotors  must  be  smooth  for satisfactory operation of the blower. If the rotors are slightly scored or burred, they may be cleaned up with emery cloth (item 13, Appendix B). (42)   Examine the rotor shaft serrations for wear, burrs, or peening. Also inspect the bearing and oil seal contact surfaces of the shafts for wear or scoring. (43)   Inspect the inside surface of the blower housing for burrs or scoring. The inside surface must be smooth for efficient  operation  of  the  blower.  If  the  inside  surface  of  the  housing  is  slightly  scored  or  burred,  it  may  be cleaned up with emery cloth (item 13, Appendix B). (44)   Check the finished ends of the blower housing for flatness or burrs. The end plates must set flat against the blower housing. (45)   The finished inside face of each end plate must be smooth and flat. If the finished face is slightly scored or burred, it may be cleaned up with emery cloth (item 13, Appendix B). NOTE Be careful not to remove metal at the joint face between the end plates and the housing. Air or oil leaks could develop after assembly. (46)   Examine the serrations in the blower timing gears for wear or peening. Also, check the gear teeth for wear, chipping, or other damage. If the gears are worn to the point where the backlash between the gears exceeds Q.004 in. (0.102 mm) or damaged sufficiently to require replacement, both gears must be replaced as a set. (47)   Check the blower drive shaft serrations for wear or peening. Replace the shaft if it is bent, cracked, or has excessive spline wear. 3-116

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