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Dirt on the bellcranks and idlers
2.  Looseness   Check   Tolerances

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-13 WARNING Be careful when feeling bellcranks and idlers for   vibration.   Personnel   can   have   fingers caught between bellcranks and idlers if care is not used. (2)   Listen     for    cracking    or    squeaking sounds.  Carefully  feel  bellcranks  and idlers for vibration. d.   Disconnect the links at the walking beams and idlers that may be binding. (Refer to TM 55-1520-240-23, Ch. 11.) NOTE Disconnecting the links and moving the walking beam and idler by hand is the most accurate meth- od of locating a binding component. (1)   Move  the  walking  beam  and  idler  by hand. Feel for binding and roughness. (2)   If binding or roughness is found, have the   walking   beam   or   idler   bearings cleaned and lubricated. (3)   Attach   the   connecting   links   to   the walking beams and idler. (Refer to TM 55-1520-240-23, Ch. 11.) e.   Attach the connecting links to the walking beams and idler. (Refer to TM 55-1520-240-23, Ch. 11.) WARNING Make sure area is clear of foreign objects be- fore closing tunnel covers. If not, damage to components or systems could result in per- sonal injury or death.







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