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Oil pump and front support repair.
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Assembly. (cont) - TM-5-4210-229-14P_457
TM5-4210-229-14&P 6-15. TRANSMISSION REPAIR (Continued). (f) Attach   the   main   pressure   regulator   and lockup spring compressor and adapters to the front support.  Tighten the compressor screws,  removing  all  forces  from  the  pin retainers   (178,   and   179).      Remove   the pins (178 and 179). (g)   Carefully loosen the screws on the spring compressor  until  it  can  be  removed  from the  front  support.    Remove  valve  stops (180   and   181),   valve   springs   (177   and 182),   regulator   valve   (183)   and   lockup valve (184). (h)   Remove the fourteen bolts (185 and 186) that   hold   the   oil   pump   and   the   front support together. (i) Separate   front   support   assembly   (171) from  oil  pump  body  and  gear  assembly (187). (j)  If   ground   sleeve   (188)   is   damaged   and support    (189)    is    serviceable,    press    the sleeve    out    of    the    support.        Mark    the position of the lube passage in the ground sleeve on front support prior to removal for correct  installation  of  the  new  sleeve.    If movement  is  detected,  the  parts  must  be replaced as an assembly. (k)   If replacement of plug (190) is necessary, remove  the  plug  from  the  circumference of support. (l) Remove   oil   pump   gears   (191   and   192) from oil pump body (193). (m) If   body   (193)   is   damaged,   replace   oil pump assembly (187). (n)   Remove oil seal (194) from oil pump body (193). (o)   Determine the serviceability of the sealring grooves on the front support hub. Insert, do not force, gauge into the groove on the support hub.  Rotate the gauge 360 degrees   around   the   hub.      If   the   gauge does    not    rotate    freely,    the    support    is damaged and should be replaced. (2) Assembly. NOTE If  an  oil  seal  installer  is  not  available,  install  the seal,  spring  loaded  lip  first,  into  the  seal  bore  of the  oil  pump.    Press  the  seal  to  0.050-0.070  inch (1.27-1.79   mm)   below   the   front   surface   of   the pump body. (a)   If   oil   seal   (194)   was   removed   from   oil pump    body    (193),    install    a    new    one. Place   the   oil   pump   body   on   the   work table, flat side down.  Seat the oil seal on the   installer   with   the   spring   loaded   lip facing  away  from  the  tool.    Attach  driver handle  to  the  oil  seal  installer.    Drive  the seal into the pump housing.  Remove the seal installer and apply a high temperature   seal   lubricant   (Appendix   D, Item  22)  to  the  inside  diameter  of  the  oil seal (194). (b)   Invert oil pump body, flat side up.  Install drive   gear   (192)   and   driven   gear   (191) into  the  oil  pump  body.    Place  a  straight edge  across  the  surface  of  the  oil  pump. Insert    a    thickness    gauge    between    the straight  edge  and  the  driven  gear  (191). Measurement can also be made with slide gauge tool.  If the clearance is not 0.001- 0.003   inch   (0.025-0.076   mm)   selective driven  gears  are  available.    Repeat  the above  procedure  for  drive  gear  (192);  if clearance is not 0.0012-0.0020 inch (0.030-0.051   mm)   selective   drive   gears are available. (c)   If  plug  (190)  was  removed  from  support (189),replace  it.    Press  the  plug  into  the bore    to    0.010    inch    (0.25    mm)    below counterbore support assembly. 6-63

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