POWER TURBINE AND REDUCTION GEARBOX (RGB)

TM 9-2835-255-34

3-2. TROUBLESHOOTING - CONTINUED

k. POWER TURBINE AND REDUCTION

(1) ES-40. RUBBING OR BINDING IS

FELT WHEN TUBEAXIAL FAN BLADES

OR LEFT COOLING FAN BLADES ARE

TURNED BY HAND. NO OTHER

ROTATION OR METAL CHIPS NOTED.

This section contains troubleshooting to locate and correct the cause(s)

of rubbing or binding when the tubeaxial fan blades or left cooling fan

blades are turned by hand when no other rotation or metal chips were

n o t e d . The power turbine and 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 cooling fan

blades are turned by hand. The transmission is mechanically coupled to

the RGB through a splined shaft. I f t h e r e i s i n t e r n a l t r a n s m i s s i o n

damage, binding will be felt when turning the tubeaxial fan blades or

left cooling fan blades by hand. The art on this page provides an

overview of the engine power turbine, RGB and transmission. Refer to

this page along with in-text art while performing troubleshooting.

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