RUBBING OR BINDING IS FELT WHEN TUBEAXIAL FAN BLADES O R LEFT COOLING FAN BLADES ARE TURNED BY HAND AND MORE THAN ONE HALF OF MAIN OIL PUMP

9-2835-255-34

3-2. TROUBLESHOOTING - CONTINUED

k. POWER TURBINE AND REDUCTION

(3) ES-42. RUBBING OR BINDING IS

GEARBOX (RGB) - CONTINUED

F E L T WHEN TUBEAXIAL FAN BLADES

O R LEFT COOLING FAN BLADES ARE

TURNED BY HAND AND MORE THAN

O N E HALF OF MAIN OIL PUMP

M A G N E T I C PLUG IS COVERED WITH

METAL CHIPS.

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, and more than one half of the main oil pump

magnetic plug is covered with metal chips. 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 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 art on this page provides an overview of the

systems described above. Refer to this page along with in-text art while

performing troubleshooting.

Change 5

3-317