Soft Start Feature - DeWalt D25831 Instruction Manual

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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 3 , with the other hand on the main handle
Fig. D
3
Trigger Switch (Fig. A)
To turn the tool on, depress the trigger switch
the tool, release the trigger switch.
D25604
In chipping mode only, lock the trigger switch on, push
the lock-on slider upwards while depressing the
2
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.
D25831
For continuous operation, move the toggle switch to the
on position. To stop continuous operation, move the toggle
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 with a Solid Bit (Fig. A)
D25601, D25604
NoTE: The D25831 has only chipping modes with no
hammerdrilling capability.
1. Set the mode selector
6
2. Set the speed and impact control dial
3. Insert the appropriate drill bit.
4. Adjust the side handle (front or rear position)
22
4 .
4
1 . To stop
to hammerdrilling mode.
7 .
3 .
5. Mark the spot where the hole is to be drilled.
6. Place the drill bit on that mark and depress the trigger
switch 1 .
7. Apply only enough pressure to engage active vibration
control (refer to Active Vibration Control).
8. 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. A)
D25601, D25604

CAUTION: Do not use a core bit for hammerdrilling
wood. Personal injury and damage to tool may result.
NoTE: The D25831 has only chipping modes with no
hammerdrilling capability.
1. Set the mode selector
6
2. Turn the speed and impact control dial
maximum speed (level 7).
3. Adjust the side handle (front or rear position)
4. Assemble the centering bit and adapter shank into
core bit.
5. Mark the spot where the hole is to be drilled.
6. Place the centering bit on that mark and depress the
trigger switch .
1
NoTE: Some core drills require the removal of centering bit
after about 0.3937" (1 cm) of penetration. If so, remove and
continue hammerdrilling.
7. 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
completely through the structure. Then drill the cored
hole halfway from each side of the structure.
8. To stop the tool, release the trigger switch.
Always turn the tool off when work is finished and
before unplugging.
Chipping (Fig. A)
1. Set the mode selector
6
2. Set the impact control dial
Electronic Speed and Impact Control).
3. Insert the appropriate chisel and rotate it by hand to
lock it into the desired position.
NoTE: For SDS Max models, only use SDS Max bits.
4. Adjust the side handle (front or rear position)
5. Depress the trigger switch
6. Apply only enough pressure to engage active vibration
control (refer to Active Vibration Control).
7. To stop the tool, release the trigger switch.
Always turn the tool off when work is finished and
before unplugging.
to hammerdrilling mode.
to the
7
3 .
to chipping mode.
to desired setting (refer to
7
3 .
1 .