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Fourth Clutch Overhaul
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Removal   of   Center   Support,   Gear   Unit,   and Second Clutch
TM 5-4210-220-34 3-7. TRANSMISSION  - Continued NOTE If   the   fourth-clutch   housing   is   replaced,   selection   of   a   proper   piston   is   imperative   before   seal   ring installation or clutch plate clearance check is done.  If the fourth-clutch housing is not replaced and a new piston is required, make sure the identification letter (M, S, or T) stamped on the new piston is Identical to that on the old piston. (11)  Place fourth-clutch housing assembly (2) on the work table, flat (rear) side downward. (12)  Before continuing the assembly, the clutch clearance must be established. (13)  Install fourth-clutch piston (11) into the clutch housing.  Do not install a seal ring into the fourth-clutch housing or on piston at this time. (14)  Beginning  with  an  external-tanged  plate,  alternately  install  five  external-tanged  plates  (6)  and  five  internal- splined plates (7) into the fourth-clutch housing (2). (15)  Install the backplate (5) and snap ring (4). (16)  Hold  the  backplate  firmly  against  the  snap ring.    Insert  gage  J24192  and  check  the clearance   at   the   location   shown.      When clearance is satisfactory, the thinner step of the  gage  will  enter  between  the  backplate and  clutch  plates;  the  thicker  step  will  not. The  prescribed  clearance  is  0.080  -  0.120 in.  (2.03 - 3.05 mm). (17)  Remove   the   snap   ring,   backplate,   clutch plates  and  piston  from  the  clutch  housing. When  clutch  plates  are   properly   selected for proper clearance, keep the clutch plates in a pack. (18)  Lubricate    with    petroleum    jelly    (item    21, Appendix  B)  and  install  a  new  teflon  seal ring  (13)  into  the  clutch  housing.    Be  sure the  lip  of  the  seal  ring  is  facing  the  bottom of the piston cavity. (19)  Place fourth-clutch  piston (11) on the work table, spring bosses side up.  Lubricate with transmission fluid (item 9, Appendix B) and install new teflon seal ring (12), lip downward  into  the  groove  on  the  outside circumference of the piston.  A seal ring for the    inside    groove    in    piston    (11)    is    not required. (20)  Centrally  locate  the  piston  in  the  housing bore  over  protector  J24216-1.    Place  the piston  and  housing  in  an  arbor  press  and apply   pressure   evenly   until   the   piston   is properly seated. 3-45

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