page 6
OPERATION
WARNING
To reduce the risk of injury, wear safety goggles or glasses with
side shields. Unplug the tool before changing accessories or
making adjustments.
Using the Forward/Reverse Switch (Fig. 6) Cat. No. 9072-20, 9072-22,
9092-20, and 9096-20
This impact wrench is equipped with a forward/reverse switch that may be
set to forward or reverse rotation.
1. For forward (clockwise) rotation, push the forward/reverse switch in
the direction shown. Check the direction of rotation before use.
2. For reverse (counterclockwise) rotation, push the forward/reverse
switch in the direction shown. Check the direction of rotation before
use.
Fig. 6
Forward
Reverse
Forward/ Reverse
Switch
WARNING
To reduce the risk of injury, keep hands and cord away from the
bit and all moving parts.
WARNING
To reduce the risk of explosion, electric shock and property
damage, always check the work area for hidden pipes and wires
before drilling.
This impact wrench may be operated at any speed from 0 to full speed.
The speed will remain variable up to the chosen speed dial setting by use
of the trigger. The speed dial turns clockwise to increase the speed or
counterclockwise to decrease the speed (Fig. 8).
1. Select a speed on the speed dial.
2. To start the tool, pull the trigger.
3. To vary the driving speed, increase or decrease pressure on the trigger.
The further the trigger is pulled, the greater the speed.
4. To stop the tool, release the trigger.
Starting and Stopping the Tool (Fig. 9)
Cat No. 9070-20, 9071-20, 9075-20
These impact wrenches are equipped with a rocker switch that offers both
forward and reverse rotation.
Rocker
switch
Fig. 9
Fig. 7
Starting, Stopping and Controlling Speed (Fig. 8) Cat. No. 9072-20,
9072-22, 9092-20, and 9096-20
Fig. 8
Trigger
Speed dial To increase
the speed
1. For forward (clockwise) rotation, pull the lower portion of the switch.
2. For reverse (counterclockwise) rotation, pull the upper portion of the
switch.
NOTE: To prevent damage to the motor and internal mechanism, allow the
motor to stop completely before switching from forward to reverse or from
reverse to forward.
Impacting Techniques
The longer a bolt, screw, or nut is impacted, the tighter it will become. To
help prevent damaging the fasteners or workpieces, avoid excessive impact-
ing. Be particularly careful when impacting smaller fasteners because they
require less impacting to reach optimum torque.
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.
Impacting for two seconds is generally suffi cient for a 3/8" bolt and one
second for a 5/16" bolt. However, oil, dirt, rust or other matter on the threads
or under the head of the fastener affects the degree of tightness.
The torque required to loosen a fastener averages 75% to 80% of the tighten-
ing torque, depending on the condition of the contacting surfaces. However,
if rust or corrosion causes seizing, more torque may be required.
On light gasket jobs, run each fastener down to a relatively light torque and
use a hand torque wrench for fi nal tightening.
WARNING
To reduce the risk of injury, only grasp tool by handle and red
insulated surfaces (Fig. 7). Do not hold gray gear case when
impacting or drilling.