(b)
Slowly and smoothly turn the tool handle to the extreme clockwise position while you monitor the torque that you apply to the handle.
(c)
Write down the maximum torque that you apply to the tool while you turn it from the extreme counterclockwise position to the extreme clockwise position.
(d)
Turn the tool back to the extreme counterclockwise position.
(e)
Turn the shaft clockwise again at approximately the same rate that you used before.
(f)
Stop at the position where the torque increases to approximately two-thirds of the maximum torque that you wrote down before.
(g)
Read the scale on the tool at this position.
NOTE: This is the position where valve butterfly starts to
____
engage the edge of the seal.
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757 MAINTENANCE MANUAL
(h) Turn the handle 13 more degrees in the clockwise direction past the reading from the previous step.
NOTE: The butterfly valve is now centered on the valve seal.
____ If you turn the valve past the target value, do not turn it back in the counterclockwise direction. You must start again with the tool handle in the extreme counterclockwise position.
S 034-133
(4)
Tighten the lockscrew on the tool to keep the adapter shaft in its position.
S 824-134
(5)
Turn the index plate until the actuator mounting holes in the index plate are aligned with the two upper holes for the actuator mounting screws.
S 824-135
(6)
Insert the two align screws into the holes for the actuator mounting screws to hold the index plate in alignment with the mounting plate (this is a final adjustment of the position of the index plate).
S 434-136
(7)
Tighten the bottom index screw to a torque of 21-23 inch pounds.
S 034-137
(8)
Carefully remove the align screws.
S 084-138
(9)
Carefully remove the alignment tool from the index plate.
S 034-139
(10)
Install the top two index screws (13) in the index plate (4) and tighten them to a torque of 21-23 inch-pounds.
(11)
Attach the index screws with lockwire.
(12)
Install the engine crossfeed valve actuator (AMM 28-22-12/401).
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本文链接地址：757 AMM 飞机维护手册 燃油 CHAPTER 28 - FUEL 3(34)
