Operation - DeWalt D25851 Instruction Manual

Electronic Speed and Impact Control
(Fig. 5)
D25602, D25831, D25851
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
chipping.
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 adaptable for many different appli-
cations. The required setting depends on the bit size and hardness
of material being drilled.
Mode Selector (Fig. 1)
CAUTION: Never change the mode while the unit is running.
CAUTION: Do not change to hammerdrill mode with chisel bit in
tool holder. Personal injury and damage to tool may result.
The D25501, D25601, D25602 uses 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 D25820,
D25831 uses only the chipping mode.
HAMMERDRILLING MODE (
The tool simultaneously rotates and impacts the work. This mode is
appropriate for all concrete and masonry operations.
CHIPPING MODE ( )
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.
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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 18 possible
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.
Power Indicator Lights (Fig. 5)
The yellow brushwear indicator LED (V) 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 (W) lights up if the lock-on slider (B) is used in
any mode except the chipping mode.
The red indicator LED (W) flashes if there is a fault with the tool or if the
brushes are completely worn (refer to Brushes under Maintenance).

OPERATION

WARNING: Always observe the safety instructions and applicable
regulations.
WARNING: To reduce the risk of injury, turn unit off and
disconnect tool from power source before installing and
removing accessories, before making any adjustments or
removing/installing attachments or accessories. An accidental
start-up can cause injury.
WARNING: To reduce the risk of personal injury, ALWAYS
ensure workpiece is anchored or clamped firmly. If drilling 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.
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