DeWalt D25891K instruction manual Assembly and Adjustments, Operation

FIG. 1 CHISEL BIT ADJUSTMENT MODE

MODE DE RÉGLAGE DU TRÉPAN ORDINAIRE

MODO DE AJUSTE DE LA BROCA DE CINCEL

HAMMERDRILLING MODE	CHIPPING MODE
MODE DE MARTEAU PERFORATEUR	MODE DE BURINAGE
MODO TALADRO PERCUTOR	MODO CINCEL

CHISEL BIT ADJUSTMENT MODE

MODE DE RÉGLAGE DU TRÉPAN ORDINAIRE

MODO DE AJUSTE DE LA BROCA DE CINCEL

E

F I

D

A

J B

G

H

E

C

FIG. 2	M	FIG. 3
		I
K
N	O

P L

J

H

C C

FIG. 4

CTC

COMPLETE

TORQUE

CONTROL

D25XXX

1 3/4"

(44mm)

SDS MAX

ROTARY

HAMMER

SER.

Q

TO REDUCE

THE RISK OF

INJURY,

INSTRUCTION

WARNING

USER

MUST READ

.

EYE, EAR AND

YS USE PROPER

USE SIDE HANDLE

MANUAL. ALWA

. ALWAYS

MANUAL DE

RESPIR

ATORY PROTECTION

LEA EL

PARA

R

ADVERTENCIA

INSTRUCCIONES

Y VÍAS

. SIEMPRE

SEGURO

UTILICE

FUNCIONAMIENTO

OJOS, OÍDOS

UN

PARA LOS

MANGO

LATERAL.

ADECUADA

PROTECCIÓN . SIEMPRE UTILICE EL

DE MINIMISER

RESPIRATORIAS

AFIN

DE

LES RISQUES

AVERTISSEMENTLIRE LE GUIDE

U

ATEUR DOIT

UNE

PROTECTION

BLESSURES,

L’UTILIS

UTILISER

ATE.

.TOUJOURS

ADÉQU

D’UTILISATION

ET RESPIRATOIRE

OCULAIRE, AUDITIVE

LATÉRALE.

MD 21286 USA

UTILISER LA POIGNÉE

CO., BALTIMORE,

DEWALT INDUSTRIAL

TOOL

1-800-4-DEWALT

TION, CALL

FOR

SERVICE INFORMA

.com

www.DEWALT

G

Service

Lock-On

Brush Service

S

T

COMPONENTS (Fig. 1)

WARNING: Never modify the power tool or any part of it. Damage or personal injury could

result.
A. Trigger switch	F. Mode selector
B. Lock-on slider	G. Electronic Speed and impact control dial
C. Side handle	H. Clamp knob
D. Main handle	I. Rear side handle position
E. Active vibration control

INTENDED USE

These heavy-duty rotary hammers have been designed for professional hammerdrilling and chipping at various work sites (i.e., construction sites). DO NOT use under wet conditions or in presence of flammable liquids or gases.

These heavy-duty rotary hammers are professional power tools. DO NOT let children come into contact with the tool. Supervision is required when inexperienced operators use this tool.

ASSEMBLY AND ADJUSTMENTS

Side Handle (Fig. 1)

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.

The side handle clamps to the front barrel (collar) and may be rotated 360° to permit right or left-hand use. For operating convenience, the side handle can be installed in front or rear positions.

TO MOUNT IN FRONT POSITION (FIG. 3)

1.Unscrew the side handle (C) and disassemble the side handle clamp (J).

2.Snap the steel ring (K) over the collar (L) behind the tool holder (M). Squeeze both ends of the steel ring together. Mount the bushing (N) and insert the pin (O).

3.Slide the side handle clamp (J) and bushing into the clamp knob (H) – do not tighten.

4.Screw the side handle (C) into the clamp knob (H) and tighten.

5.Rotate the side handle mounting assembly to the desired position. For hammerdrilling horizontally with a heavy drill bit, place the side handle assembly at an angle of approximately 20° to the tool for optimum control.

6.Lock the side handle mounting assembly in place by tightening the clamp knob (H).

TO MOUNT IN REAR POSITION (FIG. 3)

1.Unscrew the side handle (C) and remove it from the side handle mounting assembly. Leave the side handle mounting assembly in the front position.

2.Screw the side handle directly into one of the rear side handle positions (I) on either side of the tool.

Active Vibration Control (Fig. 1)

For best vibration control, hold the tool with one hand on the main handle (D) and the other hand on the side handle (C). Apply just enough pressure so the hammer is approximately mid- stroke. The hammer only needs enough pressure to engage the active vibration control. Applying too much pressure will not make the tool drill or chip faster and active vibration control will not engage.

Inserting and Removing SDS Max® Accessories (Fig. 3)

WARNING:To reduce the risk of serious personal injury, turn tool off and disconnect tool from power source before making any adjustments or removing/installing attachments or accessories.

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.

Complete Torque Control (Fig. 4)

NOTICE: Always turn the tool off before changing torque control settings or damage to tool may result.

The Complete Torque Control (CTC) feature of this tool is designed to provide additional control with a two-stage clutch mechanism.

Clutch Setting 1 (Q) 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 (R) 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 (U) to setting 1 or 2 as needed for application. NOTE: Allow the motor housing to rotate a little while changing torque.

Each time the tool is plugged in, it will automatically default to clutch setting 1, the most sensitive setting.

Electronic Speed and Impact Control (Fig. 4)

The electronic speed and impact control allows the use of smaller drill bits without the risk of bit breakage,hammerdrillingintolightandbrittlematerialswithoutshatteringandoptimaltoolcontrolfor 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 applications. 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 D25712 an D25762 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 D25831 and D25851 use 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.

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 24 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. 4)

The yellow brushwear indicator LED (S) 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 button (B) is used 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 Brushes under MAINTENANCE).

OPERATION

WARNING:To reduce the risk of serious personal injury, turn tool off and disconnect tool from power source before making any adjustments or removing/installing attachments or accessories.

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.

Proper Hand Position (Fig. 1)

WARNING: To reduce the risk of serious personal injury, ALWAYS use proper hand position as shown.

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), 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)

To turn the tool on, depress the trigger switch (A). To stop the tool, release the trigger switch. To lock the trigger switch on in the chipping mode only, push the lock-on slider (B) upwards 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 chisel mode. The machine will stop running when trying to engage the lock-on slider in drill mode. The motor will stop if the lock-on slider is activated when changing from chisel mode into drill mode.

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

D25712, D25762

NOTE: The D25891 have only chipping modes with no hammerdrilling capability.

1.Set the mode selector to hammerdrilling mode.

2.Move the torque control lever to Setting 1 (Q).

3.Set the speed and impact control dial.

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.

8.Apply only enough pressure to engage active vibration control (refer to Active Vibration Control).

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

D25712, D25762

CAUTION: Do not use a core bit for hammerdrilling wood. Personal injury and damage to tool may result.

NOTE: The D25891 has only chipping mode with no hammerdrilling capability.

1.Set the mode selector to hammerdrilling mode.

2.Move the torque control lever to Setting 2 (R).

3.Turn the speed and impact control dial to the maximum torque position.

4.Adjust the side handle (front or rear position).

5.Assemble the centering bit and adapter shank into core bit.

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 completely through the structure. Then drill the cored hole halfway from each side of the structure.

9.To stop the tool, release the trigger switch. Always turn the tool off when work is finished and before unplugging.

Chipping and Chiseling

1.Set the mode selector to chipping mode.

2.Set the impact control dial to desired setting (refer to Electronic Speed and Impact Control).