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Craftsman 320.27990 Operator's Manual page 13

8a impact wrench
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INSTALLING FASTENERS
NOTE: Always keep the Impact Wrench
at a right angle to the fastener to avoid
damaging
the fastener
head.
To fasten:
1.
Start threading the fastener by hand onto or into its threaded counterpart
(e.g. nut onto bolt, or bolt into nut or threaded hole).
2.
With the proper impact socket
securely mounted
to the wrench, slide the
impact socket onto the nut or bolt head.
3
Hold the tool securely with both hands and depress
the switch at '_j.
The impact socket will turn the fastener and impacting
will begin once the
fastener encounters
resistance.
A_, WARNING:
Do not over-tighten,
as the force of the Impact Wrench can
break the fastener.
To loosen:
1.
2
3.
With the proper impact socket securely mounted to the wrench, slide the
impact socket onto the bolt head.
Hold the tool securely with both hands and depress the switch at _.. The
tool will start to impact immediately.
Once the fastener has "broken
loose," it will start to unthread.
Be careful that
you do not allow a fastener to spin freely once it is no longer engaged
with
its threaded
counterpart,
as it may be thrown out of the socket.
IMPACTING TECHNIQUES
The proper fastening
torque may differ depending
on the type or size of the bolt,
the material of the workpiece
to be fastened,
etc.
NOTE: Hold the tool straight along the axis of the bolt or nut.
NOTE: Excessive
fastening
torque may damage the bolt/nut
or socket.
Before
starting
your job, always perform a test operation
to determine
the proper
fastening
time for your bolt or nut.
Practice with various fasteners,
noting the length of time required to reach the
desired torque.
Check the tightness
with a hand-torque
wrench.
If the fasteners
are too tight, reduce the impacting
time. If they are not tight enough, increase
the impacting
time.
Hold the tool firmly, and place the socket over the bolt or nut. Turn the tool on,
and fasten the bolt or nut to the proper torque.
The torque that is required to loosen a fastener averages 75% to 80% of the
tightening
torque, depending
on the condition
of the contacting
surfaces.
However,
if rust or corrosion
causes seizing, more torque may be required.
27990
ManuaLRevised_lO
1202
Page 13

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