LOW PRESSURE COMPRESSOR RUBS OR BINDS WHEN TURNED BY HAND AND THERE ARE METAL CHIPS IN THE OIL PUMP TO OIL COOLER FLUID FILTER.

TM 9-2835-255-34

3-2. TROUBLESHOOTING - CONTINUED

h . LOW PRESSURE COMPRESSOR -

(5) ES-32. LOW PRESSURE COMPRESSOR

CONTINUED

RUBS OR BINDS WHEN TURNED BY

HAND AND THERE ARE METAL CHIPS

IN THE OIL PUMP TO OIL COOLER

FLUID FILTER.

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

of low pressure compressor rubbing or binding when turned by hand, when

there are metal chips in the oil pump to oil cooler fluid filter. The

low pressure compressor is mechanically coupled to the low pressure

t u r b i n e rotor in the rear engine subassembly. If there is damage to the

low pressure compressor or position No. 1 or 2 bearing in the forward

engine module, o r t o t h e l o w p r e s s u r e t u r b i n e r o t o r o r p o s i t i o n N o . 5

bearing in the rear engine subassembly, b i n d i n g w i l l b e f e l t w h e n t h e

low pressure compressor is turned by hand. The lubrication system

delivers hot oil, which is scavenged from bearing packages throughout

the engine, t h r o u g h a f l u i d f i l t e r t o t h e e n g i n e o i l c o o l e r . T h e c o o l e d

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 description, i t w o u l d b e l o g i c a l t o a s s u m e t h a t

position number 1, 2 or 5 bearings may be faulty. The accessory gearbox

(AGB) magnetic plug s h o u l d a l s o b e m o r e t h a n o n e h a l f c o v e r e d w i t h m e t a l

chips unless it was previously wiped clean. The art on the following

pages provides an overview of the systems described above. Refer to

these pages along with in-text art while performing troubleshooting.

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