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COMPONENTS (FIG. 1)
WARNING: Never modify the power tool or any part of it. Damage or personal injury could
result.
A. Trigger switch
D. Speed/Mode selector collar
B. Reversing lever
E. Side handle
C. Chuck
INTENDED USE
These heavy-duty hammerdrills are designed for professional drilling and hammerdrilling. DO
NOT use under humid conditions or in presence of flammable liquids or gases.
These heavy-duty hammerdrills are professional power tools. DO NOT let children come into
contact with the tool. Supervision is required when inexperienced operators use this tool.
Side Handle (Fig. 1)
WARNING: To reduce the risk of personal injury, ALWAYS operate the tool with the side
handle properly installed. 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.
A side handle (E) is supplied with this hammerdrill. It clamps to the front of the gear case as
shown in Figure 1 and can be rotated 360˚ for right- or left- hand use.
After the side handle is rotated into position, it should be pushed rearward until the slots (F)
on the lip of the side handle are aligned and fully engaged with the projecting tabs (G) on the
underside of the gear case. The side handle is then securely clamped by turning clockwise until
tight.
Trigger Switch (Fig. 2)
To start hammerdrill, depress the trigger switch (A). To stop hammerdrill, release the trigger
switch.
VARIABLE SPEED TRIGGER SWITCH (FIG. 2)
The variable speed trigger switch (A) permits speed control. The farther the trigger switch is
depressed, the higher the speed of the hammerdrill.
NOTE: Use lower speeds for starting holes, drilling in plastics or ceramics or driving screws.
REVERSING LEVER (FIG. 2)
The reversing lever (B), located above the trigger switch, changes the direction of rotation of the
hammerdrill and is used when backing out screws and jammed drill bits.
To operate the tool in reverse, release the trigger switch and push the lever to the left (when
viewed from the chuck end).
To operate the drill in forward, release the trigger switch and push the lever to the right (when
viewed from the chuck end).
Return the reversing lever to the forward position after all operations in reverse are completed.
High/Low Speed Operation (Fig. 1, 3)
The two speed gear drive in the dual range hammerdrill permits effective operation over an
extended range of applications with greater selection of accessories.
For LOW SPEED operation, turn the collar (D) to the drill bit symbol for drilling position 1.
For HIGH SPEED operation, turn the collar (D) to the drill bit symbol for drilling position 2.
The gear train has been designed for shifting only when the unit is off. It may be necessary
however, to rotate the chuck slightly by hand to align the gears while turning the collar.
CAUTION: DO NOT ATTEMPT TO CHANGE SPEEDS by turning the collar when the tool is
running. Doing so will damage the gear train.
Hammer/Drill Selector (Fig. 3)
To switch the tool from the drilling mode to the hammering mode (or vice-versa) rotate the
collar (D) to the applicable symbol as shown in Figure 3.
Turn the collar (D) to the drill bit symbol for drilling or to the hammer symbol for hammerdrilling,
as shown in the figure.
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 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. 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: Do not attempt to tighten or loosen drill bits (or any other accessory) by gripping
the front part of the chuck and turning the tool on. Damage to the chuck and personal injury
may occur.
WARNING: Burn Hazard. ALWAYS wear gloves when changing bits. Accessible metal parts
on the tool and bits may get extremely hot during operation. Small bits of broken material may
damage bare hands.
Keyed Chucks (Fig. 1)
Open chuck jaws by turning collar with fingers and insert shank of bit about 3/4" (19 mm) into
chuck (C). Tighten chuck collar by hand. Place chuck key in each of the three holes, and tighten
in clockwise direction. It's important to tighten chuck with all three holes to prevent slippage. To
release bit, turn chuck key counterclockwise in just one hole, then loosen the chuck by hand. Any
authorized D
WALT service center can install a keyless chuck in place of a keyed chuck.
E
Depth Rod
To adjust the depth rod (H), loosen the handle (E) and move rod so that the distance between the
end of the rod and the end of the bit equals the desired drilling depth. When drilling with depth
rod, stop when end of rod reaches surface of material.
Drilling
Turn the collar to the drill bit symbol for drilling or to the hammer symbol for hammerdrilling. Install
and tighten the desired drill bit in the chuck.
DRILLING OPERATION
Select the desired speed/torque range using the speed selector collar to match the speed and
torque to the planned operation.
1. For WOOD, use twist bits, spade bits, power auger bits or hole saws. For METAL, use high-
speed steel twist drill bits or hole saws. Use a cutting lubricant when drilling metals. The
exceptions are cast iron and brass which should be drilled dry. For MASONRY, use carbide-
tipped bits or masonry bits. A smooth, even flow of dust indicates the proper drilling rate.
2. Always apply pressure in a straight line with the bit. Use enough pressure to keep the drill bit
biting, but do not push hard enough to stall the motor or deflect the bit.
3. Hold tool firmly with both hands to control the twisting action of the drill.
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.
4. IF DRILL STALLS, it is usually because it is being overloaded. RELEASE TRIGGER
IMMEDIATELY, remove drill bit from work, and determine cause of stalling. DO NOT
CLICK TRIGGER OFF AND ON IN AN ATTEMPT TO START A STALLED DRILL – THIS
CAN DAMAGE THE DRILL.
5. To minimize stalling or breaking through the material, reduce pressure on drill and ease the
bit through the last fractional part of the hole.
6. Keep the motor running when pulling the bit back out of a drilled hole. This will help prevent
jamming.
7. With variable speed drills there is no need to center punch the point to be drilled. Use a slow
speed to start the hole and accelerate by squeezing the trigger harder when the hole is deep
enough to drill without the bit skipping out.
HAMMERDRILL OPERATION
1. When drilling, use just enough force on the hammer to keep it from bouncing excessively or
"rising" off the bit. Too much force will cause slower drilling speeds, overheating, and a lower
drilling rate.
2. Drill straight, keeping the bit at a right angle to the work. Do not exert side pressure on the
bit when drilling as this will cause clogging of the bit flutes and a slower drilling speed.
3. When drilling 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 drilling rate.
MAINTENANCE
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.
FIG. 1
DWD520
C
D
B
A
E
FIG. 2
B
shown in
forward
A
position
illustré en
position
avant
mostrada
en posición
HAMMER SETTING
adelantada
RÉGLAGE MARTELAGE
AJUSTE DEL MARTILLO
Cleaning
WARNING: Blow dirt and dust out of all air vents with dry air at least once a week. Wear
proper ANSI Z87.1 (CAN/CSA Z94.3) eye protection and proper NIOSH/OSHA/MSHA
respiratory protection when performing this.
WARNING: Never use solvents or other harsh chemicals for cleaning the non-metallic parts
of the tool. These chemicals may weaken the plastic materials used in these parts. Use a cloth
dampened only with water and mild soap. Never let any liquid get inside the tool; never immerse
any part of the tool into a liquid.
Lubrication
Your tool was properly lubricated before leaving the factory. In from two to six months, depending
upon use, take or send your tool to an authorized service center for a complete cleaning,
inspection and lubrication. Tools used constantly on production jobs will need relubrication more
often. Also, tools "out of service" for long periods should be relubricated before being put back
to work.
Accessories
WARNING: Since accessories, other than those offered by D
with this product, use of such accessories with this tool could be hazardous. To reduce the risk
of injury, only D
WALT, recommended accessories should be used with this product.
E
Recommended accessories for use with your tool are available at extra cost from your local dealer
or authorized service center. If you need assistance in locating any accessory, please contact
D
WALT Industrial Tool Co., 701 East Joppa Road, Baltimore, MD 21286, call 1-800-4-D
E
(1-800-433-9258) or visit our website www.dewalt.com.
MAXIMUM RECOMMENDED CAPACITIES
CHUCK CAPACITY
R.P.M.
BITS, METAL DRILLING
WOOD, FLAT BORING
BITS, MASONRY DRILLING
optimum
maximum
Repairs
To assure product SAFETY and RELIABILITY, repairs, maintenance and adjustments (including
brush inspection and replacement) should be performed by a D
a D
WALT authorized service center or other qualified service personnel. Always use identical
E
replacement parts.
Three Year Limited Warranty
D
WALT will repair, without charge, any defects due to faulty materials or workmanship for
E
three years from the date of purchase. This warranty does not cover part failure due to normal
wear or tool abuse. For further detail of warranty coverage and warranty repair information, visit
www.dewalt.com or call 1-800-4-D
WALT (1-800-433-9258). This warranty does not apply to
E
accessories or damage caused where repairs have been made or attempted by others. This
warranty gives you specific legal rights and you may have other rights which vary in certain
states or provinces.
In addition to the warranty, D
WALT tools are covered by our:
E
1 YEAR FREE SERVICE
D
WALT will maintain the tool and replace worn parts caused by normal use, for free, any time
E
during the first year after purchase.
90 DAY MONEY BACK GUARANTEE
If you are not completely satisfied with the performance of your D
Nailer for any reason, you can return it within 90 days from the date of purchase with a receipt
for a full refund – no questions asked.
LATIN AMERICA: This warranty does not apply to products sold in Latin America. For products
sold in Latin America, see country specific warranty information contained either in the
packaging, call the local company or see website for warranty information.
FREE WARNING LABEL REPLACEMENT: If your warning labels become illegible or are
missing, call 1-800-4-D
WALT for a free replacement.
E
DWD525
C
D
B
E
A
H
F
G
E
FIG. 3
RÉGLAGE PERÇAGE
AJUSTE DE BROCA
PARA ALTA VELOCIDAD
WALT, have not been tested
E
DWD520
DWD525
1/2" (13 mm)
1/2" (13 mm)
0–1200 / 0–3500
0–1200 / 0–3500
1/2" (13 mm) low speed
1/2" (13 mm) low speed
1-1/2" (40 mm)
1-1/2" (40 mm)
3/16"–3/8" (5–10 mm)
3/16"–7/16" (10– 11 mm)
3/4" (20 mm)
3/4" (20 mm)
WALT factory service center,
E
WALT Power Tool, Laser, or
E
HIGH SPEED
DRILL SETTING
HAUTE VITESSE
LOW SPEED
DRILL SETTING
RÉGLAGE
PERÇAGE VITESSE
RÉDUITE
AJUSTE DE
BROCA
PARA BAJA
VELOCIDAD
WALT
E
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