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repair (cont) - TM-5-4210-220-34_412
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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_414
TM 5-4210-220-34 3-8. ENGINE Continued (97)   Remove the two bolts and washers that were used to draw the gears into position on the rotor shafts. (98)   Lubricate  the  threads  of  the  1/2  in.  20  x  1-1/2  in.  gear  retaining  capscrews  (20)  with  engine  oil  (item  17, Appendix B). Place a spacer (21) on each of the capscrews and thread them Into the rotor shafts. Tighten the bolts to 110 ft lb (150 Nm). Remove the cloth from the blower rotors. NOTE After the blower rotors and timing gears are installed, the blower rotors must be timed. Carry out steps 99 thru 107 to time the blower rotors. Before timing the blower, install four 5/16 in. 18 x 1-7/8 in. bolts with flatwashers through four bolt holes in each end plate (top and bottom) and thread them into the blower housing.  Tighten the bolts to 17 ft lb (23 Nm). This will hold the end plates against the blower housing so the proper clearance between the rotors and the end plate can be obtained. (99) The blower rotors, when properly positioned in  the  housing,  run  with  a  slight  clearance between  the  lobes.  This  clearance  may  be varied by moving one of the helical gears in or out on the shaft relative to the other gear. (100)  If  the  right-hand  helix  gear  (10  is  moved out, the   right-hand   helix   rotor   will   turn counterclockwise    when    viewed    from    the gear  end.  If  the  left-hand  helix  gear  (22)  is moved out, the left-hand helix rotor will turn clockwise  when  viewed  from  the  gear  end. This  positioning  of  the  gears,  to  obtain  the proper  clearance  between  the  rotor  lobes, is known as blower timing. (101)  Moving  the  gears  OUT  or  IN  on  the  rotor shafts is accomplished by adding or removing   shims   (24)   between   the   gears and the bearings. (102)  The clearance between the rotor lobes may be   checked   with   1/2   in.   (12.7   mm)   wide feeler gages as shown. A specially designed  feeler  gage  set  J1698-02  for  the blower    clearance    operation    is    available. Clearances should be measured  from  both the inlet and outlet sides of the blower. 3-123

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