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repair (cont) - TM-5-4210-220-34_411
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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_413
TM 5-4210-220-34 3-8. ENGINE Continued 3-8.3 Blower Continued (C) Rotor to Housing Clearance Air Inlet Side minimum 0.015 in. (0.381 mm) (D) Rotor to Housing Clearance Air Outlet Side minimum 0.004 in. (0.102 mm) NOTE One  serration  is  omitted  on  the  drive  end  of  each  blower  rotor  shaft  and  a  corresponding  serration  is omitted in each gear. Assemble the gears on the rotor shafts with the serrations in alinement. The center punch  mark  in the end of  each rotor shaft at the omitted  serration  will  assist  in  alining  the  gears  on  the shafts. If shims were removed from the back side of the gears (between the inner race of the bearing and the gear), they should be replaced in their original positions before installing the gears on their respective shafts. (90)   Place the blower assembly on the bench, with the top of the housing up and the rear end (serrated end of rotor shafts) of the blower facing the outside of the bench. (91)   Rotate the rotors to bring the omitted serrations on the shafts in alinement and facing to the left as shown. (92)   Install   a   0.140   in.   (3.56   mm)   thick   gear spacer and the same number and thickness of shims (24) on each rotor shaft that were removed at the time of disassembly. (93)   Lubricate  the  serrations  of  the  rotor  shafts with engine oil (item 17, Appendix B). (94)   Place  the  teeth  of  the  rotor  gears  in  mesh so   that   the   omitted   serrations   inside   the gears are in alinement and facing the same direction as the serrations on the shafts. (95)   Start both rotor gears straight on the rotor shafts with the right-hand helix gear (10) on the right-hand helix rotor (19) and the left-hand helix gear (22) on the left-hand helix rotor (18), with the omitted serrations in the gears in line with the omitted serrations on the rotor shafts. (96)   Thread a 1/2 in. 20 x 1-1/4 in. bolt with a thick washer into the end of each rotor shaft.  Place a clean folded cloth  between  the  lobes  of  the  rotors  (18  and  19)  to  prevent  the  gears  from  turning.  Draw  the  gears  into 3-122

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