3. Job Set-up
__________ Subtask 20-21-15-941-050
A. Functions
(1) The application of tightening torques on electrical component fasteners permits:
-
the electrical and mechanical connection of a terminal to the component
-
the mechanical attachment of the component to its support
-
the mechanical connection of the various component parts, one with the other
-
the removal and installation of the fasteners for maintenance.
4. Procedure
_________ Subtask 20-21-15-912-050
A. General Requirements and Precautions
(1)
You must tighten the fasteners with a torque wrench and calibrated screwdriver.
(2)
Do not change the original lubrication of the hardware.
(3)
To install a nut on a stud or a bolt in a nut:
(a)
Align the two components axially.
(b)
Apply a light pressure and turn "to loosen" until you feel a click on the first thread.
(c)
Turn "to tighten" by two turns.
(d)
TORQUE with the applicable tool.
1_ When you have a stacked assembly with the bolt or the nut in
contact with the components, manually make sure that the
components are in the correct position before you apply the
torque.
1EFF : ALL 1 20-21-15Page 202 1 1 Nov 01/99R 1 1 1CES 1
R 2 Apply the tightening torque in one continuous operation._
R
R NOTE : If you do not apply the torque in one continuous____
R operation (limited travel or access), do the last
R tightening operation with a sufficient movement (with a
R rotation of 30 degrees minimum).
Subtask 20-21-15-912-051
R B. Special Requirements and Precautions
(1) Connection fasteners
R Use a wiring principle that prevents stress in the cables that can
R cause loosening of the fasteners.
(2) Attachment fasteners
When the diameter of the attachment fasteners is less than the
diameter of the connection fasteners:
R - make sure that you do not cause damage to the attachment of the
R component on the support when you apply the torque to the
R connection fasteners.
R (3) fasteners for assembly/locking
R You must not use the nuts and bolts to assemble or mate the
R components. The fasteners must be used only to finalize the
R operation.
R (4) Electrical connections that are not used
R (a) Terminal studs that are not used
R Remove the nut and leave the stud free.
(b) Others
R Tighten the connection screws and nuts to the specified torque
R values.
R (5) Limitation of use
R (a) You cannot use the self-locking nuts again.
R (b) For other types of fasteners, you can use them again in these
R conditions:
R - The threads and mating surfaces are not damaged.
R - The protection of the fasteners and the surface condition is
R not damaged.
R
R NOTE : If you use the bolts and nuts again, this:____
R
R - Makes the pre-tension weaker because it decreases the
R satisfactory effect of the lubricant.
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