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Page Title: AGB GEAR TRAIN TURNS UNEVENLY (BINDS) WHEN TURNED BY HAND, RUBBING OR BINDING IS FELT WHEN TUBEAXIAL FAN BLADES OR LEFT COOLI...
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TM 9-2835-255-34
3-2. TROUBLESHOOTING - CONTINUED
E S - 1 0 . AGB GEAR TRAIN TURNS
(l0)
ACCESSORY GEARBOX (AGB) AND
U N E V E N L Y (BINDS) WHEN TURNED BY
HIGH PRESSURE COMPRESSOR -
H A N D , RUBBING OR BINDING IS
CONTINUED
F E L T WHEN TUBEAXIAL FAN
B L A D E S OR LEFT COOLING FAN
BLADES ARE TURNED BY HAND AND
T H E R E ARE METAL CHIPS IN THE
O I L PUMP TO OIL COOLER FLUID
FILTER.
This  section  contains  troubleshooting  to  locate  and  correct  cause(s)  of
binding  in  the  AGB  gear  train  when  turned  by  hand,  rubbing  and  binding
when  the  tubeaxial  fan  blades  or  left  cooling  fan  blades  are  turned  by
hand,  and  metal  chips  in  the  oil  pump  to  oil  cooler  fluid  filter.  The
AGB  is  coupled  to  the  high  pressure  compressor  in  the  forward  engine
module  through  a  gearshaft.  If  there  is  damage  to  the  high  pressure
compressor,  forward  engine  module  position  No.  3,  4,  11  or  12  bearing,
or  AGB  gears  and/or  bearings,  binding  will  be  felt  when  the  AGB  gear
train  is  turned  by  hand. The power turbine and reduction gearbox (RGB)
are  coupled  mechanically  through  the  power  shaft.  If  there  is  damage  to
the  power  turbine,  rear  engine  subassembly  position  No.  6A  or  6B
bearing,  or  RGB  bearings  and/or  gears,  binding  will  be  felt  when  the
tubeaxial  fan  blades  or  left  coolinq  fan  blades  are  turned  by  hand.  The
RGB  oil  return  line  feeds  directly  into  the  oil  pump  passage  that  houses
the  magnetic  plug.  The  only  possible  source  of  metal  chips  on  the  oil
pump  magnetic  plug  is  the  RGB.  The  transmission  is  mechanically  coupled
to  the  RGB  through  a  splined  shaft.  If  there  is  internal  transmission
damage,  binding  will  be  felt  when  turning  the  tubeaxial  fan  blades  or
cooler  fan  blades  by  hand. The  lubrication  system  delivers  hot  oil,
scavenged  from  bearing  packages  throughout  the  engine,  through  a  fluid
filter,  to  the  engine  0il  cooler.  Cooled  oil  is  then  returned  to  the  oil
tank.  Whenever  metal  chips  are  generated,  the  fluid  filter  will  catch
and  retain  most  of  the  chips.  Based  on  the  above  described  symptoms,  two
separate  failures  may  have  occurred. The  art  on  the  following  pages
provides  an  overview-of  the  related  systems.  Refer to  these  pages  along
with  in-text  art  while  performing  troubleshooting.
3-81
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