Instruction Manual

ENGLISH
8
NOTE: Continuous use in variable speed range is not
recommended. It may damage the switch and should
beavoided.
Forward/Reverse Control Button (Fig. A)
• A forward/reverse control button
2
determines the
direction of the tool and also serves as a lock-offbutton.
• To select forward rotation, release the trigger switch
and depress the forward/reverse control button on the
right side of thetool.
• To select reverse, release the trigger switch and depress
the forward/reverse control button on the left side of
thetool.
• The center position of the control button locks the tool
in the off position. When changing the position of the
control button, be sure the trigger isreleased.
NOTE: The first time the tool is run after changing the
direction of rotation, you may hear a click on start up. This is
normal and does not indicate aproblem.
LED Work Light (Fig. A)

WARNING: Do not place the light in a position
which may cause anyone to intentionally or
unintentionally stare into the light. Serious eye
injury couldresult.
When impact driver is activated by pulling the variable
speed trigger switch
1
, the integrated LED work light
7
will automatically illuminate the work area.
NOTE: The LED work light is for lighting the immediate
work surface and is not intended to be used as a flashlight.
Quick-Release Chuck (Fig. A, D, E)

WARNING: Use only impact accessories. Non-impact
accessories may break and cause a hazardous
condition. Inspect accessory prior to use to ensure that
it con tains nocracks.
NOTE: The chuck accepts 1/4" (6.35 mm) hexaccessories.
Place the forward/reverse button
2
in the lock-off
(center) position or remove battery pack before
changingaccessories.
To install an accessory, fully insert the accessory. The
accessory is locked into place (Fig.D).
To remove an accessory, pull the chuck collar
3
away
from the front of the tool. Remove the accessory (Fig.E).
Fig.D
3
Fig.E
3
Speed Selector (Fig. A)
Your tool is equipped with a speed selector
9
which allows
you to select one of three modes. Select the speed based
on the application and control the speed of the tool using
the variable speed trigger switch
1
.
CMCF820
Mode 1 Light impacting rpm 0–1300
Mode 2 Normal impacting rpm 0–2600
Mode 3 High speed impacting rpm 0–2900
Usage
Your impact tool can generate the following
maximumtorque:
Mode Ft.-Lbs. In.-Lbs. Nm
1 45 550 62
2 129 1550 175
3 147 1700 192

CAUTION: Ensure fastener and/or system will
withstand the level of torque generated by the tool.
Excessive torque may cause breakage and possible
personal injury.
1. Place the accessory on the fastener head. Keep the tool
pointed straight at the fastener.
2. Press switch to start operation. Release switch to stop
operation. Always check torque with a torque wrench,
as the fastening torque is affected by many factors
including the following:
- Voltage: Low voltage, due to a nearly discharged
battery, will reduce fastening torque.
- Accessory size: Failure to use the correct accessory
size will cause a reduction in fasteningtorque.
- Bolt size: Larger bolt diameters generally require
higher fastening torque. Fastening torque
will also vary according to length, grade, and
torquecoefficient.
- Bolt: Ensure that all threads are free of rust and
other debris to allow proper fastening torque.
- Material: The type of material and surface finish of
the material will affect fastening torque.
- Fastening time: Longer fasten ing time results in
increased fastening torque. Using a longer fastening