If a part resists removal, check to be certain all nuts
cables, tag each one to ensure proper identification
and bolts have been removed and that an adjacent
part is not interfering.
DISASSEMBLY AND ASSEMBLY.
Effective mechanical grounding of electrical
When assembling or disassembling a component or
components and systems is important for proper
system, complete each step in turn. Do not partially
operation as well as reducing EMI/EMC effects. The
assemble one part and start assembling some other
following procedures apply to all mechanical ground
Make all adjustments as recommended.
points, where grounding may occur:
Always check the job after it is completed to see that
nothing has been overlooked. Recheck the various
directly, through the inherently-grounded
(case-grounded) mounting hardware of a
performance by operating the machine before
returning it to the job.
through a discrete wire, connected to a
single component's insulated ground
terminal, or to several components (e.g. as
When pressing one part into another, use an anti-
in a ground wire emanating from a harness
seize compound or a molybdenum disulfide base
compound to lubricate the mating surfaces.
To ensure adequate grounding, it is essential that all
Assemble tapered parts dry. Before assembling
paint, rust, grease, etc. is removed from the contact
parts with tapered splines, be sure the splines are
area of the frame, component, and any intermediate
clean, dry, and free from burrs. Position the parts
contact surfaces, before the connection is made. It is
together by hand to mesh the splines before applying
also important that the various components making
up the connection are installed in the exact order/
locations depicted (e.g. mounting hardware).
Parts which are fitted together with tapered splines
are always very tight. If they are not tight, inspect the
To prevent subsequent formation of rust, fungus, etc.
tapered splines, discard the part if splines are worn.
that may grow between the contact surfaces, and
thus eventually impair the ground connection, each
ground connection is to be sprayed with fungus-
resistant varnish per MIL-V-173 or commercial
equivalent, immediately following installation.
to lock nuts and bolts.
Flat metal locks must be installed properly to be
effective. Bend one end of the lock around the edge
When shims are removed, tie them and identify them
of the part. Bend the other end against one flat
as to location. Keep shims clean and flat until they
surface of the nut or bolt head.
Always use new locking devices on components
which have moving parts.
When an Antifriction bearing is removed, cover it to
aluminum, use a flat washer between the lockwasher
keep out dirt and abrasives. Wash bearings in non-
flammable cleaning solution and allow them to drain
dry. The bearing may be dried with compressed air
WIRES AND CABLES.
BUT DO NOT spin the bearing.
Batteries should always be disconnected prior to
Discard the bearings if the races and balls or rollers
working on the electrical system.
are pitted, scored, or burned. If the bearing is
serviceable, coat it with oil and wrap it in clean waxed
When removing or disconnecting a group of wires or
paper. Do not unwrap new bearings until time of