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The label o nyourtool m ay include t hefollowing symbols. The symbols andtheir d efinitions
areasfollows:
V.
. ................ volts
Hz ................ hertz
min .............. minutes
---
........... direct current
@ ................ Class I Construction
(grounded)
[] ................ Class II Construction
(double insulated)
BPM ............ beats per minute
A .................... amperes
W ................... watts
.................. alternating current
no ................... no load speed
................... earthing terminal
,& ................... safety alert symbol
.../min ............ revolutions or reciprocation
per minute
COMPONENTS
WARNING: Never modify the power tool or any part of it. Damage or personal injury could
result.
A. Trigger switch
E Side handle
B. Locking button
G. Handle grip
C. Reversing lever
D. Shift knob
E. Hammer/drill selector
INTENDED USE
The DW505 and DW520 heavy-duty hammerdrills have been designed for professional drilling
and hammerdrilling, screwdriving and light chipping, chiselling, demolition applications and for
carbide-tipped core drilling at various work sites (i.e., construction sites). DO NOT use under
humid conditions or in presence of flammable liquids or gases.
The DW505 and DW520 heavy-duty hammerdrills are professional power tools. DO NOT let chil-
dren come into contact with the tool. Supervision is required for those under 16 years of age.
Side
Handle
(Fig.
1)
A 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 (F) 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 (H)
on the lip of the side handle are aligned and fully engaged with the projecting tabs (I) on the
underside of the gear case. The side handle is then securely clamped by turning the handle grip
(G) clockwise until tight.
Switch
(Fig.
2)
To start hammerdrill, depress the trigger switch (A). To stop hammerdrill, release the trigger
switch.
A WARNING: Be sure to release the locking mechanism before disconnecting
the plug from
the power supply, Failure to do so will cause the hammerdrill to start immediately the next time
it is plugged in. Damage or personal injury could result.
To lock the trigger switch in the ON position for continuous operation, depress the trigger switch
and push up the locking button (B). The tool will continue to run. To turn the tool OFF, from a
locked-on condition, squeeze and release the trigger once. Before using the tool (each time), be
sure that the locking button release mechanism is working freely.
DO NOT lock the switch on when drilling by hand so that you can instantly release the
trigger switch if the bit binds in the hole. The locking button is for use ONLY when the hammerdrill
is mounted in a drill press stand or other wise held stationary.
VARIABLE SPEED
The variable speed trigger switch permits speed control. The farther the trigger switch is
depressed, the higher the speed of the hammerdrill.
NOTE: Use lower speeds for starting holes without a centerpunch, drilling in metal, plastics or
ceramics, or driving screws. Higher speeds are better for drilling in wood and composition board
and for using abrasive and polishing accessories.
REVERSING LEVER
The reversing lever (C)is used to reverse the hammerdrill for backing out screws or jammed bits.
It is located above the trigger, shown in Figure 2. To reverse the hammerdrill, turn it off and push
the reversing lever to the left (when viewed from the chuck end).
To position the lever for forward operation, turn the hammerdrill off and push the lever to the right
(when viewed from the chuck end).
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, the shift knob (D) located on the underside of the hammerdrill
should be rotated so the low speed setting is toward the front of the tool.
For HIGH SPEED operation, the shift knob (D) should be rotated so the high speed setting is
toward the front of the tool.
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 shift knob. DO
NOT A-I-I-EMPTTO CHANGE SPEEDS by turning the shift knob when the tool is running. Doing
so will damage the gear train.
Hammer/Drill
Selector
(Fig.
4)
To switch the tool from the drilling mode to the hammering
mode (or vice-versa)
rotate the
selector (E) to the applicable symbol as shown in Figure 4.
For straight drilling,
align selector with drill bit symbol.
For hammering,
align selector with the hammer symbol, as shown in the figure.
NOTE: The selector must be in either drill or hammer/drill
mode at all times. There are no
operable positions between the two.
Chuck
i_ 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.
To insert the bit, open chuck jaws by turning collar with fingers counterclockwise
(when viewed
from the chuck end) and insert shank of bit about 1/2" (13 mm) into chuck. 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 release the bit, turn collar key counterclockwise
in just one hole, then loosen the chuck by
hand turning collar counterclockwise
(when viewed from the chuck end).
OPERATION
Drilling
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.
A 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
1. Use sharp drill bits only. For WOOD, use the low speed setting and twist drill bits, spade bits,
power auger bits, or hole saws. For METAL, use the low speed setting and steel twist drill bits
or hole saws. For MASONRY, such as brick, cement, cinder block, etc., use carbide-tipped
bits rated for percussion drilling. Use low speed for bits greater than 3/8" (10 mm).
2. Always apply pressure in a straight line with the bit. Use enough pressure to keep drill 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.
4. IF DRILL STALLS, it is usually because it is being overloaded or improperly used. RELEASE
TRIGGER IMMEDIATELY, remove drill bit from work, and determine cause of stalling. DO
NOT CLICK TRIGGER
ON AND OFF IN AN AFFEMPT TO START A STALLED
DRILL
mTHIS CAN DAIVlAGETHE 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.
FIG. 1
FIG. 2
C
FIG. 3
LOW SPEED SE'Fi-ING
R#GLAGE
EN VITESSE
LENTE
CONFIGURACI()N
DE
BAJA VELOCI DAD
HIGH SPEED SE'Fi-ING
R#GLAGE
EN
HAUTE VITESSE
CONFIGURACI()N
DE
ALTA VELOCI DAD
FIG. 4
HAMMER SE'Fi-ING
R#GLAGE
EN
MODE MARTEAU
PERFORATEUR
CONFIGURACI()N
DE
TALADRADO
POR
PERCUSI()N
DRILL SE'Fi-ING
--
R#GLAGE EN MODE
PERCEUSE
CONFIGURACI()N
DE TALADRADO
DRILLING IN METAL
USE ONLY in the low-speed gear range. Start drilling with slow speed and increase to full
power while applying firm pressure on the tool. A smooth even flow of metal chips indicates the
proper drilling rate. Use a cutting lubricant when drilling metals. The exceptions are cast iron and
brass which should be drilled dry.
NOTE: Large [5/16" (8 mm) to 1/2" (13 mm)] holes in steel can be made easier if a pilot hole
[5/32" (4 mm) to 3/16" (5 mm)] is drilled first.
DRILLING IN WOOD
USE ONLY in the Iow-spead gear range. Start drilling with slow speed and increase to full
power while applying firm pressure on the tool. Holes in wood can be made with the same twist
drills used for metal. These bits may overheat unless pulled out frequently to clear chips from
the flutes. Work that is apt to splinter should be backed up with a block of wood.
DRILLING IN MASONRY
When drilling in masonry, use carbide tipped bits rated for percussion drilling and be certain that
the bit is sharp. For holes up to 3/8" (10 mm) diameter use the high-speed gear range. For holes
larger than 3/8" (10 mm), use the the low-speed gear range. Ensure that the hammer mode is
selected. Use a constant and firm force on the tool to drill most effectively. A smooth, even flow
of dust indicates the proper drilling rate.
Depth
Rod
To adjust the depth rod, loosen the handle 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.
MAINTENANCE
A 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.
C_anmg
A CAUTION: 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, depend-
ing 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 DEWALT, have not been tested
with this product, use of such accessories with this tool could be hazardous. To reduce the risk
of injury, only DEWALT, recommended
accessories
should be used with this product.
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 DEWALT Industrial Tool Co., 701 East Joppa Road, Baltimore, MD 21286, call 1-800-4-
DEWALT (1-800-433-9258)
or visit our website www.dewalt.com.
MAXIMUM RECOMMENDED
CAPACITIES
DWS05
DW520
CHUCK CAPACITY
R.RM.
BITS_ METAL DRILLING
WOOD, FLAT BORING
BITS, MASONRY DRILLING
optimum
maximum
Repairs
1/2" (13 ram)
0-1 _100 - 0-2_700
1/2" (13 mm) low speed
1-1/2" (40 mm)
low speed
1/2" (13 ram)
0-1 _100 - 0-2_700
1/2" (13 mm)low speed
1-1/2" (40 mm)
low speed
3/16 - 3/8" (5 - 10 ram)
1/2" (13 mm)
3/16 - 7/16" (10 - 11 ram)
3/4" (20 mm)
To assure product SAFETY and RELIABILITY, repairs, maintenance and adjustments (including
brush inspection and replacement) should be performed by a DEWALT factory service center,
a DEWALT authorized service center or other qualified service personnel. Always use identical
replacement parts.
Three
Year Limited
Warranty
DEWALT will repair, without charge, any defects due to faulty materials or workmanship for 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 1-8OO-4-DEWALT (1-800-433-9258). This warranty does not apply to acces-
sories 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.
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