AGB GEAR TRAIN TURNS UNEVENLY (BINDS) WHEN TURNED BY HAND, RUBBING OR BINDING IS FELT WHEN TUBEAXIAL FAN BLADES OR LEFT COOLING FAN BLADES ARE TURNED BY HAND-continued

9 - 2 8 3 5-255-34

3-2. TROUBLESHOOTING - CONTINUED

( 9 ) ES-9.

AGB GEAR TRAIN TURNS

a. 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 FELT

CONTINUED

W H E N TUBEAXIAL FAN BLADES OR

L E F T COOLING FAN BLADES ARE

TURNED BY HAND AND MORE THAN ONE

H A L F OF AGB MAGNETIC PLUG IS

C O V E R E D WITH METAL CHIPS. -

CONTINUED

CONTINUED FROM STEP 1

CAUTION

Extreme care should be taken

when handling low pressure

turbine rotor shaft (1).

Banging, jarring or rough

handling will cause damage to

No. 5 b e a r i n g c a r b o n s e a l .

Lift end (2) of shaft (1)

slightly to center shaft

(1), then push shaft (1) in

to establish clearance

between power turbine disc

(3) and nozzle (4) and to

load No. 5 bearing (5).

B. Turn shaft (2). Listen and

feel for rubbing or binding.

C. Check rotation of power

turbine in rear engine

subassembly (6) by turning

shouldered shaft (7)

clockwise. Shaft should turn

smoothly and no unusual

noises should be heard.

Do both shafts turn

smoothly

with

no unusual noises?

YES--

Go to step 5.

CONTINUED ON NEXT PAGE

3-71

Change 5