DeWalt 20V MAX DCN890 Instruction Manual page 73

Unloading the Tool
WARNING: The trigger lock-off should always be
locked off whenever any adjustments are made or
when tool is not in use.
1. Slide the spring-loaded pusher latch to the base of the
magazine to lock it into place.
2. Tip the tool up until the fastener strip slides freely out of
the magazine.
3. With battery removed, check the nosepiece to verify
there are no pins remaining.
NOTE: The tool is equipped with a magnet in the nose
area for improved tool performance. When unloading,
always verify that the small sticks of pins are not held to the
magnetized nose piece.
Power Setting Summary (Fig. H, I)
This nailer is equipped with a power selection switch
adjust the tool when driving into different materials.
Power setting 1: Softer materials (low strength concrete/
cinder block)
Power setting 2: Medium hardness materials (High strength
concrete)
Power setting 3: Hard materials (Structural Steel)
In the event pins are not driving to depth in power setting 1,
you may have to switch to power 2 or 3 for additional
driving power.
Fig. H
3
NOTICE: Driving pins into soft materials at high
power settings will cause excessive wear to your
tool and may result in early failures.
Power
Application
Setting
Fastening Steel/Wood to Low Strength
1
Concrete/Masonry (<4000 psi)
Fastening Steel/Wood to High Strength
2
Concrete (>4000 psi)
Fastening Steel/Wood to High Strength
Concrete (>4000 psi)
3
Fastening to structural steel;
2x4 to Concrete
WARNING: Pins must be driven straight into the
material. Do not tilt nailer while driving fasteners.
Refer to Fig. I. Pin retention values improve when the
tool is fired perpendicular to the material.
Fig. I
3 to
Actuating the Tool (Fig. A)
The motor rotation speed is automatically restored after
driving a pin to allow fast consecutive nailing.
1. Release the trigger lock-off
2. Push the contact trip
3. Pull the trigger switch
4. Release the trigger and raise the nailer from the
5. Repeat steps 3–5 to actuate the next nail.
Pin/Fastener Troubleshooting
Typical Pin Length
3/4" to 1" typ.
3/4" to 1-1/2" typ.
1/2" or 2-1/4"typ.
WARNING: Always wear proper eye [ANSI Z87.1
(CAN/CSA Z94.3)] and ANSI S12.6 (S3.19) hearing
protection when operating tool.
6 against the work surface.
1
work surface. NOTE: The tool motor returns to full
speed automatically without the contact trip
being depressed.
Properly driven pin
CONCRETE
Pin does not hold in the concrete.
Cause:
-
-
Action:
-
-
ENGLISH
.
2
to actuate the tool.
6
Over driven pin
Too hard/high strength
concrete.
Hard or large aggregate
in concrete.
Use shorter pin.
Switch to higher power
setting.
11