2. Slide the D-shaped handle assembly over the tool holder (M) and onto the collar (L) in the
mounting area (W). The correct position of the D-shaped handle (X) is between head and middle
of the tube.
3. Adjust the D-shaped handle to the desired angle.
4. Slide and rotate the D-shaped handle to the desired position.
5. Lock the D-shaped handle in place by securely tightening the knob (Q) so that the D-shaped
handle assembly will not rotate.
SHOCKS Active Vibration Control
®
System (Fig. 1, 7)
For best vibration control, hold the tool with one hand on the main handle (D) and the other hand
on the side handle (C) or D-shaped handle (X). Apply just enough pressure so the hammer is
approximately mid-stroke. The hammer only needs enough pressure to engage the SHOCKS
Active Vibration Control
®
system. Applying too much pressure will not make the tool drill or chip
faster and the SHOCKS Active Vibration Control
®
system will not engage.
Inserting and Removing SDS Max Accessories (Fig. 5)
1. Pull back the locking sleeve (P) and insert the bit shank. The bit shank must be clean and
slightly lubricated.
2. Turn the bit slightly until the sleeve snaps back into position.
3. Ensure the bit is properly engaged.
NOTE:
The bit needs to move several centimeters in and out of the tool holder (M) when
properly engaged.
4. To remove the bit, pull back the locking sleeve and pull the bit out.
Two-Stage Clutch/E-Clutch
TM
(Fig. 6)
NOTICE:
Always turn the tool off before changing torque control settings or damage to tool may
result.
TWO-STAGE CLUTCH
D25712, D25723, D25763
Clutch Setting 1 (R) is designed for most hammerdrilling applications and is designed to easily
clutch out when the drill bit encounters re-bar or other foreign substances.
Clutch Setting 2 (S) is designed for higher torque applications such as core-bits and deep hole
hammerdrilling and is designed to clutch out at a higher torque threshold.
Move the torque control lever (V) to Clutch Setting 1 or 2 as needed for application.
NOTE:
Allow the motor housing to rotate a little while changing torque.
NOTE:
If it is not possible to select Clutch Setting 2, run the unit under load and try again.
Each time the tool is plugged in, it will automatically default to Clutch Setting 1, the most
sensitive setting.
E-CLUTCH™
D25723, D25763
In addition, E-Clutch™ offers increased user comfort and safety through an on-board antirotation
technology capable of detecting if the user loses control of the hammer. When a jam is detected,
the torque and speed are reduced instantly. The red indicator LED (T) illuminates when E-Clutch™
is engaged.
Electronic Speed and Impact Control (Fig. 6)
The electronic speed and impact control allows the use of smaller drill bits without the risk of bit
breakage, hammerdrilling into light and brittle materials without shattering and optimal tool control for
precise chiseling.
To set the control dial, turn the dial (G) to the desired level. The higher the number, the greater
the speed and impact energy. Dial settings make the tool extremely flexible and adaptable for
many different appli cations. The required setting depends on the bit size and hardness of material
being drilled.
Mode Selector (Fig. 1)
NOTICE:
Never change the mode while the unit is running. Tool must come to a complete stop
before activating the mode selector button or damage to the tool may result.
CAUTION:
Do not change to hammerdrill mode with chisel bit in tool holder. Personal injury and
damage to tool may result.
The D25712, D25721, D25723, D25761, D25763 use two operating modes. To select the required
operating mode, rotate the mode selector (F) until the arrow points to the hammerdrilling or the
chipping icon. The D25871 and D25891 use only the chipping mode.
HAMMERDRILLING MODE (
)
D25712, D25721, D25723, D25761, D25763
The tool simultaneously rotates and impacts the work. This mode is appropriate for all concrete
and masonry operations.
CHIPPING MODE (
)
D25871, D25891
The spindle lock is engaged during chipping mode so the tool impacts the work without
rotating. This mode is appropriate for light chipping, chiseling and demolition applications.
NOTE:
In chipping mode, the hammerdrill can also be used as a lever to free a jammed drill bit.
CHISEL BIT ADJUSTMENT (
)
Turn the mode selector to one of the chisel bit adjustment icons to adjust the chisel to the desired
position. There are multiple positions to set the angle of the chisel. After finding the desired position,
slightly maneuver the chisel bit back and forth to ensure the chisel is properly engaged.
Indicator Lights (Fig. 1, 6)
The yellow brush wear indicator LED (U) lights up when the carbon brushes are nearly worn out
indicating that the tool needs servicing within the next 8 hours of use.
The red indicator LED (T) lights up if the lock-on slider (B) and/or E-Clutch™ is engaged in any
mode except the chipping mode.
The red indicator LED (T) starts to flash if there is a fault with the tool or the brushes have completely
worn out (refer to
Repairs
under
Maintenance
).
INDICATOR
DIAGNOSIS
SOLUTION
OFF
Tool is functioning
normally
Follow all warnings and
instructions when operating tool
SOLID
Perform and protect
control has been
activated
With tool properly supported,
release trigger; the tool will
function normally when the
trigger is depressed again and
the indicator light will go out
FLASHING
Perform and
protect control is
malfunctioning
Take the tool to an authorized
D
E
WALT repair agent.
NOTE:
If the tool power is insufficient for normal hammering and if the LED does not flash
repeatedly after cycling the trigger, take the tool to an authorized D
E
WALT repair center.
OPERATION
WARNING: To reduce the risk of injury, turn unit off and disconnect it from power
source before installing and removing accessories, before adjusting or when making
repairs.
An accidental start-up can cause injury.
WARNING: To reduce the risk of personal injury, ALWAYS ensure workpiece is anchored
or clamped firmly.
If hammerdrilling thin material, use a wood “back-up” block to prevent damage
to the material.
WARNING: To reduce the risk of personal injury, ALWAYS operate the tool with the
side handle properly installed and securely tightened.
Failure to do so may result in the side
handle slipping during tool operation and subsequent loss of control. Hold tool with both hands to
maximize control.
WARNING:
Drill may stall if overloaded causing a sudden twist. Always expect the stall. Grip the
drill firmly with both hands to control the twisting action and avoid injury.
Proper Hand Position (Fig. 7)
WARNING:
To reduce the risk of serious personal injury,
ALWAYS
use proper hand position as
shown in Figure 7.
WARNING:
To reduce the risk of serious personal injury,
ALWAYS
hold securely in anticipation
of a sudden reaction.
Proper hand position requires one hand on the side handle (C) or D-shaped handle (X), with the
other hand on the main handle (D).
NOTE:
Operating temperature of this tool is 19˚ to 104˚ F (-7 to +40˚ C). Using the tool outside of
this temperature range will decrease the life of the tool.
Trigger Switch (Fig. 1)
D25712, D25721, D25723, D25761, D25763
To turn the tool on, depress the trigger switch (A). To stop the tool, release the trigger switch.
In chipping mode only, lock the trigger switch on by pushing the lock-on slider (B) upward while
depressing the trigger switch.
To deactivate the lock-on slider, depress the trigger switch once then release.
The lock-on slider may only be activated in chipping mode. The machine will stop running when
trying to engage the lock-on slider in hammerdrilling mode. The motor will stop if the lock-on slider is
activated when changing from chisel mode into hammerdrilling mode.
D25871, D25891
For continuous operation, move the rocker switch to the on position. To stop continuous operation,
move the rocker switch to the off position.
SOFT START FEATURE
The soft start feature allows you to build up speed slowly, thus preventing the drill bit from walking
off the intended hole position when starting. The soft start feature also reduces the immediate
torque reaction transmitted to the gearing and the operator if the hammer is started with the drill
bit in an existing hole.
Hammerdrilling (Fig. 1)
Set the mode selector (F) to hammerdrilling mode.
1. When hammerdrilling, use just enough force on the hammer to keep it from bouncing
excessively or “rising” off the bit. Too much force will cause slower hammerdrilling speeds and
overheating.
2. Drill straight, keeping the bit at a right angle to the work. Do not exert side pressure on the bit
when hammerdrilling as this will cause clogging of the bit flutes and a slower hammerdrilling
speed.
3. When hammerdrilling deep holes, if the hammer speed starts to drop off, pull the bit partially
out of the hole with the tool still running to help clear debris from the hole.
4. For masonry, use carbide-tipped bits or masonry bits. A smooth even flow of dust indicates the
proper hammerdrilling rate.
HAMMERDRILLING WITH A SOLID BIT (FIG. 1, 6)
D25712, D25721, D25723, D25761, D25763
NOTE:
The D25871 and D25891 have only chipping modes with no hammerdrilling capability.
1. Set the mode selector (F) to hammerdrilling mode.
2. For D25723 and D25763 only, move the torque control lever (V) to Setting 1 (R).
3. Set the speed and impact control dial (G).
4. Insert the appropriate drill bit.
5. Adjust the side handle (front or rear position).
6. Mark the spot where the hole is to be drilled.
7. Place the drill bit on that mark and depress the trigger switch (A).
8. Apply only enough pressure to engage active vibration control (refer to
SHOCKS Active
Vibration Control
®
System
).
9. To stop the tool, release the trigger switch. Always turn the tool off when work is finished and
before unplugging.
HAMMERDRILLING WITH A CORE BIT (FIG. 1, 6)
D25712, D25721, D25723, D25761, D25763
CAUTION:
Do not use a core bit for hammerdrilling wood. Personal injury and damage to tool
may result.
NOTE:
The D25871 and D25891 have only chipping modes with no hammerdrilling capability.
1. Set the mode selector (F) to hammerdrilling mode.
2. For D25723 and D25763 only, move the torque control lever (V) to Setting 2 (S).
3. Turn the speed and impact control dial (G) to a desired speed position.
4. Adjust the side handle (front or rear position).
5. Assemble the centering bit and adapter shank into the core bit and insert into tool.
6. Mark the spot where the hole is to be drilled.
7. Place the centering bit on that mark and depress the trigger switch.
NOTE:
Some core drills require the removal of centering bit after about 1 cm of penetration. If
so, remove and continue hammerdrilling.
8. When hammerdrilling through a structure thicker than the depth of the core bit, break away
the round cylinder of concrete or core inside the bit at regular intervals. To avoid unwanted
breaking away of concrete around the hole, first drill a hole the diameter of the centering bit
HAMMERDRILLING MODE
MODE DE MARTEAU PERFORATEUR
MODO TALADRO PERCUTOR
CHIPPING MODE
MODE DE BURINAGE
MODO CINCEL
CHISEL BIT ADJUSTMENT MODE
MODE DE RÉGLAGE DU TRÉPAN ORDINAIRE
MODO DE AJUSTE DE LA BROCA DE CINCEL
CHISEL BIT ADJUSTMENT MODE
MODE DE RÉGLAGE DU TRÉPAN ORDINAIRE
MODO DE AJUSTE DE LA BROCA DE CINCEL
FIG. 1
FIG. 6
U
G
T
R
S
V
FIG. 2
K
J
O
H
C
N
L
P
M
FIG. 3
C
I
F
E
A
I
G
B
E
C
H
D
X
Q
W
FIG. 4
D25871
D25891
M
FIG. 5
P
M
L
D25712
D25721
D25723
D25761
D25763
X
D
D25871
D25891
FIG. 7
D
C
D25712
D25721
D25723
D25761
D25763
