Hilti DD 500 User manual

401008
Operating instructions en
Mode d’emploi fr
Manual de instrucciones es
DD 350/
DD 500
Printed: 08.07.2013 | Doc-Nr: PUB / 5145291 / 000 / 01

This Product is Certified
Ce produit est homologué
Producto homologado por
Este produto está registrado
C US
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1
en
It is essential that the operating instructions
are read and understand before the
machine is operated for the first time.
Always keep these operating instructions
together with the machine.
Ensure that the operating instructions are
with the machine when it is given to other
persons.
ORIGINAL OPERATING INSTRUCTIONS
DD 350/DD 500 diamond core drilling system
1. General information
1.1 Safety notices and their meaning
-DANGER-
Draws attention to imminent danger that will lead to seri-
ous bodily injury or fatality.
-WARNING-
Draws attention to a potentially dangerous situation that
could lead to serious personal injury or fatality.
-CAUTION-
Draws attention to a potentially dangerous situation that
could lead to slight personal injury or damage to the
equipment or other property.
-NOTE-
Draws attention to an instruction or other useful infor-
mation.
Contents Page
1. General information 1
2. General safety rules 3
3. Specific safety rules and symbols 4
4. Functional description 6
5. Assembly 7
6. Operation 10
7. Maintenance 13
8. Accessories 13
9. Troubleshooting 14
10. Disposal 16
11. Manufacturer's warranty – tools 16
Operating controls, parts and indicators
Machine (machine and drill stand) 
Machine
@Service indicator
;Iron Boost button
=OFF switch
%Drilling performance indicator (Power Controls)
&ON switch
(Temperature monitor/ground fault
)Gear selector
+Water flow regulator
§Chuck
/Supply cord with GFCI (DD 350)/supply cord
(DD 500)
:Carrying grips (2x)
·Water hose connector
$Type plate
£Interface
Drill stand
|Column
¡Carriage cap
QStrut
WBase plate
EClamping spindle (not included)
RClamping nut (not included)
TAnchor (not included)
ZLeveling screws (3x)
UHole center indicator
ICarriage
OEccentric (machine) locking bolt
PDirect drive
ÜReduction gear
[Carriage locking mechanism
]Hand wheel
Æ Carrying grip (2x)
ºSupply cord guide
•Type plate
ALeveling indicators (2x)
SEnd stop
DWheel assembly mounting point
ACCESSORIES
Vacuum base plate
FPressure gauge
GVacuum release valve
HVacuum seal
JVacuum hose connector
KWheel assembly mounting point
Water flow indicator
LWater flow indicator
Water collector system
ÖWater collector holder
ÄWater collector
†Seal
ŒSeal
ÅWater outlet cap
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1.2 Explanation of warning signs and other symbols
1.3 Other information
These numbers refer to the corresponding illustra-
tions. The illustrations can be found on the fold-out cover
pages. Keep these pages open while studying the oper-
ating instructions.
In these operating instructions, the designation “the
machine” refers to the DD 350 or DD 500 core drilling
machine.
Location of identification data on the machine
The type designation and serial number can be found
on the rating plate on the machine. Make a note of this
data in your operating instructions and always refer to
it when making an enquiry to your Hilti representative
or service department.
Type: DD 350 DD-HD 30
Serial no.:
Type: DD 500 DD-HD 30
Serial no.:
On the vacuum base plate On the machine
VACUUM
VACUUM
Top:
An additional means of secur-
ing the drill stand must be
employed when used for hori-
zontal drilling with vacuum
attachment.
Bottom:
Use of the vacuum base plate
to secure the drill stand for
overhead drilling is not per-
missible.
Operate only when connected to a
functioning GFCI.
(Only for DD 350, 220–240 V)
PRCD
208188
Prohibition signs
Transport by
crane is not
permissible.
Warning signs
General
warning
Warning:
electricity
Warning:
hot surface
Read the operat-
ing instructions
before use.
Other symbols
Recycle waste
material.
V
~no∅
HzW/min
A
rpm
Amps Volts Watts Hertz Revolutions
per minute
Revolutions
per minute
Alternating
current
Nominal
speed under
no load
Diameter
Obligation signs
Wear eye
protection
Wear a safety
helmet
Wear ear
protection
Wear safety
gloves
Wear safety
boots
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2. General safety rules
WARNING! Read and understand all instructions.
Failure to follow all instructions listed below may
result in electric shock, fire and/or serious personal
injury. SAVE THESE INSTRUCTIONS.
2.1 Work area
a) Keep your work area clean and well lit. Cluttered
benches and dark areas invite accidents.
b) Do not operate power tools in explosive atmos-
pheres, such as in the presence of flammable
liquids, gases or dust. Power tools create sparks
which may ignite the dust or fumes.
c) Keep bystanders, children and visitors away
while operating a power tool. Distractions can
cause you to lose control.
2.2 Electrical safety
a) Grounded tools must be plugged into an outlet
properly installed and grounded in accordance
with all codes and ordinances. Never remove
the grounding prong or modify the plug in any
way. Do not use any adaptor plugs. Check with a
qualified electrician if you are in doubt as to
whether the outlet is properly grounded. If the
tools should electrically malfunction or break
down, grounding provides a low-resistance path
to carry electricity away from the user.
b) Avoid body contact with grounded surfaces such
as pipes, radiators, ranges and refrigerators.
There is an increased risk of electric shock if your
body is grounded.
c) Don’t expose power tools to rain or wet condi-
tions. Water entering a power tool will increase
the risk of electric shock.
d) Do not abuse the cord. Never use the cord to
carry the tools or pull the plug from an outlet.
Keep cord away from heat, oil, sharp edges or
moving parts. Replace damaged cords immedi-
ately. Damaged cords increase the risk of electric
shock.
e) When operating a power tool outside, use an
outdoor extension cord marked “W-A” or “W”.
These cords are rated for outdoor use and reduce
the risk of electric shock.
2.3 Personal safety
a) Stay alert, watch what you are doing and use
common sense when operating a power tool. Do
not use tool while tired or under the influence of
drugs, alcohol or medication. A moment of inat-
tention while operating power tools may result in
serious personal injury.
b) Dress properly. Do not wear loose clothing or
jewelry. Contain long hair. Keep your hair, cloth-
ing and gloves away from moving parts. Loose
clothes, jewelry or long hair can be caught in
moving parts.
c) Avoid accidental starting. Be sure switch is off
before plugging in. Carrying tools with your fin-
ger on the switch or plugging in tools that have
the switch on invites accidents.
d) Remove adjusting keys or wrenches before turn-
ing the tool on. A wrench or a key that is left
attached to a rotating part of the tool may result in
personal injury.
e) Do not overreach. Keep proper footing and bal-
ance at all times. Proper footing and balance
enables better control of the power tool in unex-
pected situations.
f) Use safety equipment. Always wear eye protec-
tion. Dust mask, non-skid safety shoes, hard hat
or hearing protection must be used for appropri-
ate conditions.
2.4 Power tool use and care
a) Use clamps or other practical way to secure and
support the workpiece to a stable platform.
Holding the work by hand or against your body is
unstable and may lead to loss of control.
b) Do not force tool. Use the correct tool for your
application. The correct tool will do the job better
and safer at the rate for which it is designed.
c) Do not use tool if switch does not turn it on or
off. Any tool that cannot be controlled with the
switch is dangerous and must be repaired.
d) Disconnect the plug from the power source
before making any adjustments, changing
accessories, or storing the tool. Such preventive
safety measures reduce the risk of starting the
tool accidentally.
e) Store idle tools out of reach of children and
other untrained persons. Tools are dangerous in
the hands of untrained users.
f) Maintain tools with care. Keep cutting tools
sharp and clean. Properly maintained tools with
sharp cutting edges are less likely to bind and are
easier to control.
g) Check for misalignment or binding of moving
parts, breakage of parts and any other condition
that may affect the tool’s operation. If damaged,
have the tool serviced before using. Many acci-
dents are caused by poorly maintained tools.
h) Use only accessories that are recommended by
the manufacturer for your model. Accessories
that may be suitable for one tool may become haz-
ardous when used on another tool.
2.5 Service
a) Tool service must be performed only by quali-
fied repair personnel. Service or maintenance
performed by unqualified personnel could result in
a risk of injury.
b) When servicing a tool, use only identical
replacement parts. Follow instructions in the
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Maintenance section of this manual. Use of
unauthorized parts or failure to follow Mainte-
nance Instructions may create a risk of electric
shock or injury.
3.1 Proper organization of the work area
a) Approval must be obtained from the site engi-
neer or architect prior to beginning drilling
work. Drilling work on buildings and other struc-
tures may influence the statics of the structure,
especially when steel reinforcing bars or load-
bearing components are cut through.
b) Ensure that the workplace is well ventilated.
Exposure to dust at a poorly ventilated workplace
may result in damage to the health.
c) When drilling through walls, cover the area
behind the wall, as material or the core may fall
out on the other side of the wall. When drilling
through ceilings, secure (cover) the area below
as drilled material or the core may drop out and
fall down.
d) Wear respiratory protection if the work causes
dust.
e) It is recommended that rubber gloves and non-
skid shoes are worn when working outdoors.
f) Do not allow other persons to touch the machine
or the extension cord.
g) Always lead the supply cord, extension cord and
water hose away from the tool or machine to the
rear to prevent a tripping hazard while working.
h) Keep the supply cord, extension cord, suction
hose and vacuum hose away from rotating parts.
i) WARNING: Before beginning drilling, check that
there are no live electric cables located in the
base material.
j) Concealed electric cables or gas and water
pipes present a serious hazard if damaged while
you are working. Accordingly, check the area in
which you are working beforehand (e.g. using a
metal detector). External metal parts of the
machine may become live, for example, when an
electric cable is damaged accidentally.
k) Do not work from a ladder.
l) WARNING: Some dust created by grinding, sand-
ing, cutting and drilling contains chemicals known
to cause cancer, birth defects or other reproductive
harm, or serious and permanent respiratory or
other injury. Some examples of these chemicals are:
lead from lead-based paints, crystalline silica from
bricks, concrete and other masonry products and
natural stone, arsenic and chromium from chemi-
cally-treated lumber. Your risk from these exposures
3. Specific safety rules and symbols
varies, depending on how often you do this type of
work. To reduce exposure to these chemicals, the
operator and bystanders should work in a well-
ventilated area using approved safety equipment
such as respiratory protection appropriate for the
type of dust generated and designed to filter out
microscopic particles. Direct dust away from face
and body. Avoid prolonged contact with dust. Wear
protective clothing and wash exposed areas with
soap and water. Allowing dust to get into your
mouth, eyes, or to remain on your skin may pro-
mote absorption of harmful chemicals.
m) WARNING: The tool may be operated only with
a correctly-functioning RCD residual current
device / GFCI ground fault circuit interrupter.
Check the electric supply each time before use
to ensure that an RCD residual current device /
GFCI ground fault circuit interrupter is present
and in working order.
3.2 Operation and storage
a) Check that all core bits are in good condition
before use. Do not use deformed or damaged core
bits.
b) The machine is not intended for use by children,
by debilitated persons or those who have receiv-
ed no instruction or training.
c) Children must be instructed not to play with the
machine.
d) Use the right tool or machine for the job. Do not
use the tool or machine for purposes for which it
was not intended. Use it only as directed and
when in faultless condition.
e) Use the power tool, accessories and tool bits
etc., in accordance with these instructions and
in the manner intended for the particular type of
power tool, taking into account the working con-
ditions and the work to be performed. Use of the
power tool for operations different from those
intended could result in a hazardous situation.
f) Use only the genuine Hilti accessories or ancil-
lary equipment listed in the operating instruc-
tions. Use of accessories or ancillary equipment
not listed in the operating instructions may pre-
sent a risk of personal injury.
g) Keep the hand wheel dry, clean and free from oil
and grease.
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h) Never leave the machine unattended.
j) Store machines in a secure place when not in
use. When not in use, machines must be stored
in a dry, high place or locked away out of reach
of children.
j) Always disconnect the supply cord from the
electric supply when the machine is not in use
(e.g. during breaks between working), before
making adjustments, before carrying out care
and maintenance and before changing core bits.
This safety precaution prevents the machine start-
ing unintentionally.
k) Never operate the machine without the GFCI
supplied with it. Test the GFCI each time before
use.
l) Check the machine and its accessories for any
damage. Safety devices and any slightly dam-
aged parts must be checked carefully to ensure
that they function faultlessly and as intended.
Check that moving parts function correctly with-
out sticking and that no parts are damaged. All
parts must be fitted correctly and fulfill all con-
ditions necessary for correct operation of the
machine. Damaged safety devices and other
parts must be repaired or replaced properly at
an authorized service center unless otherwise
indicated in the operating instructions.
m) Avoid skin contact with drilling slurry.
n) Wear a protective mask during work that gener-
ates dust, e.g. dry drilling. Connect a dust
removal system. Drilling in materials hazardous
to the health (e.g. asbestos) is not permissible.
3.3 Mechanical
a) Follow the instructions concerning care and
maintenance.
b) Check that the core bits used are compatible
with the chuck system and that they are secured
in the chuck correctly.
c) Make sure that the machine is correctly and
securely mounted on the drill stand.
d) Do not touch rotating parts.
e) Check that all the clamping screws are correctly
tightened.
f) Make sure that the cover with built-in end stop is
always fitted to the drill stand. The safetyrele-
vant end-stop function becomes inoperative if
this component is not fitted.
3.4 Electrical
a) Check the condition of the machine and its
accessories. Do not operate the machine and its
accessories if damage is found, if the machine
is incomplete or if its controls cannot be oper-
ated faultlessly.
b) Do not touch the supply cord or extension cord if
it is damaged while working. Disconnect the
supply cord plug from the power outlet.
c) Damaged or faulty switches must be replaced at
a Hilti service center. Do not use the machine if
it cannot be switched on and off correctly.
d) Have the machine repaired only by a trained
electrical specialist (Hilti service center) using
genuine Hilti spare parts. Failure to observe this
point may result in risk of accident to the user.
e) Check the machine’s supply cord at regular
intervals and have it replaced by a qualified
specialist if found to be damaged. Check exten-
sion cords at regular intervals and replace them
if found to be damaged.
f) When working outdoors, use only extension
cords that are approved and correspondingly
marked for this application.
g) Avoid using extension cords with multiple power
outlets and the simultaneous use of several
electric tools or machines connected to one
extension cord.
3.5 Thermal
Wear protective gloves when changing core bits.
The core bit may become hot during use.
3.6 Requirements to be met by users
a) The machine is intended for professional use.
b) The machine may be operated, serviced and
repaired only by authorized, trained personnel.
This personnel must be informed of any special
hazards that may be encountered.
c) Improve the blood circulation in your fingers by
relaxing your hands and exercising your fingers
during breaks between working.
3.7 Personal protective equipment
The user and any other persons in the vicinity must
wear ANSI Z87.1-approved eye protection, a hard
hat, ear protection, protective gloves and safety
footwear while the machine is in use.
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6
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4. Functional description
4.1 Use of the equipment as intended
The DD 350 or DD 500 with the DD HD-30 drill stand,
form drilling rigs designed for wet core drilling in min-
eral materials using diamond core bits (hand-held use
is not permissible).
The machine must always be mounted on the drill stand
when in use and the drill stand secured adequately to
the base material by means of an anchor or vacuum base
plate.
Manipulation or modification of the machine, drill stand
or accessories is not permissible. To avoid the risk of
injury, use only genuine Hilti accessories and insert tools.
Observe the information printed in the operating instruc-
tions concerning operation, care and maintenance.
Observe the safety precautions and operating instruc-
tions for the accessories used.
Do not strike the base plate with a hammer or other heavy
object when making adjustments to it.
The machine, drill stand, accessories and insert tools
may present hazards when used incorrectly by untrained
personnel or not as directed.
The machine may be operated only when connected to
an adequately rated electric supply equipped with an
earth/ground conductor.
DD 350
Equipment
System with water collector
System without water collector
Core bit diameters
2˝–10˝ (50–250 mm)
2˝–20˝ (50–500 mm)
Drilling direction
All directions
All directions
The machines are designed and built in accordance with
IP55 and are thus resistant to sprayed water. This allows
drilling to be carried out in all directions without use of
a wet-type industrial vacuum cleaner.
The machines may be operated only when connected to
an adequate cooling water supply (at least 0.5 l/min. at
max. 96°F (30°C) water temperature).
If the drill stand column is extended to a length of 6.56
ft (2 m) or longer, an additional means of support, e.g.
the clamping spindle (item no. 305940) must be used.
Horizontal drilling in conjunction with the vacuum base
plate (accessory) is permissible only when an additional
means of securing the drill stand is employed.
Drilling into materials hazardous to the health (e.g.
asbestos) is not permissible.
4.2 Items supplied
DD 350 or DD 500 diamond drilling machine
Operating instructions
DD 500
Equipment
System with water collector
System without water collector
Core bit diameters
31/4˝–10˝ (82–250 mm)
31/4˝–24˝ (82–600 mm)
Drilling direction
All directions
All directions
Machine
Rated voltage*
Rated current input*
Rated frequency
Rated speed under no
load
Chuck
Max. permissible water supply
pressure
Min. required water flow rate
Dimensions (LxWxH)
Nominal weight (machine)
Nominal weight (drill stand)
DD 350 DD 500
240 V ~ 480 V 3 ~
15 A 8 A
50/60 Hz 50/60 Hz
270–670 270–580
/min /min
BL (or other types)
6 bar (at higher pressures, a pressure reduction valve must be fitted at the
site water supply connection)
0.5 l/min (at max. 96°F (30°C) 1 l/min (at max. 96°F (30°C)
water temperature) water temperature)
23.9˝ ×7.6˝ ×8.5˝ (608 ×192 ×216 mm)
32 lb (14.4 kg) 37 lb (16.6 kg)
40.4 lb (18.3 kg) 40.4 lb (18.3 kg)
4.3 Technical data
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Max. operating weight
Drilling range (max.)
Drilling depth
Protection class as per
EN/IEC 61029
Resistant to dust and sprayed
water (IP code)
** The machine is available in several versions with different voltage ratings. Please refer to the type plate for the voltage rating of your machine.
en
7
154 lb (70 kg) (machine, drill stand, 183 lb (83 kg) (machine, drill stand,
20˝ (500 mm) dia. core bit) 24˝ (600 mm) dia. core bit)
82–350 (500) 102–500 (600)
max. 20˝ (500) mm without extension
Protection class I (earthed/grounded)
IP55
-CAUTION-
The end cap must be fitted on the end of the column. It
serves as a protector and as the end stop.
5.1.2 Fitting the hand wheel 
-NOTE-
The hand wheel can be fitted on the left or right side of
the carriage, on either of the two axles. The upper axle
drives the carriage directly while the lower axle drives
the carriage by way of reduction gearing.
1. Fit the hand wheel to one of the two axles on either
the left or right side of the carriage.
2. Secure the hand wheel with the screw provided.
5.1.3 Fastening the drill stand with an anchor 
-WARNING-
Use an anchor suitable for the material on which you
are working and observe the anchor manufacturer's
instructions.
-NOTE-
Hilti M16 metal expansion anchors are usually suitable
for fastening diamond core drilling equipment to uncracked
concrete. Under certain conditions it may be necessary
to use an alternative fastening method. Please contact
Hilti Technical Service if you have any questions about
secure fastening.
1. Set the anchor, of a type suitable for the material on which
you are working, ideally at a distance of 330 mm (13")
from the center of the point where the hole is to be drilled.
2. Screw the clamping spindle (accessory) into the anchor.
3. Position the drill stand over the spindle and bring it
into alignment with the aid of the hole center indica-
tor. When the spacer is used (accessory), the hole
center indicator cannot be used to align the drill stand.
4. Screw the clamping nut onto the spindle but do not
tighten it.
5. Level the base plate by way of the 3 leveling screws.
The two level indicators on the carriage serve as a lev-
eling aid.
6. Use a 27 mm AF open-end wrench to tighten the clamp-
ing nut on the spindle. Do not strike it with a hammer or
other heavy object as this may cause damage to the base
plate. The strut can be pivoted out of the way to facili-
5. Assembly
i
-CAUTION-
The mains voltage must correspond with the informa-
tion printed on the type plate.
Ensure that the machine is disconnected from the elec-
tric supply.
5.1 Preparations
-CAUTION-
The machine, the diamond core bit and the drill stand
are heavy. There is a risk of pinching parts of the body.
Wear a hard hat, protective gloves and safety footwear.
The hatched area in the drawing above indicates the danger
zone around the machine. Parts of the body must be kept
at least 6˝ (15 cm) away while the machine is in operation.
5.1.1 Setting up the drill stand 
-NOTE-
If the drill stand has been folded up to facilitate trans-
port, proceed as follows:
1. Release the screws at the top end of the strut and at
the column pivot.
2. Pivot the column into the vertical position (as far as
it will go).
3. Tighten the screw at the top end of the strut and at
the column pivot securely.
min. 6˝ (15 cm)
min. 6˝ (15 cm)
min. 6˝ (15 cm)
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tate access. This part, however, must be refitted and fas-
tened securely to the column before operating the machine.
7. Check that the drill stand is fastened securely.
5.1.4 Fastening the drill stand with the vacuum
base plate (accessory) 
-CAUTION-
Check the surface on which the vacuum base plate is to
be mounted. An uneven, rough surface can significantly
reduce the effectiveness of the vacuum fastening sys-
tem. Coatings or laminated surfaces may be pulled away
while working with the vacuum base plate.
-CAUTION-
Suitable for use only with core bits of up to 12˝ (300
mm) diameter and without use of a spacer.
-NOTE-
The hand grip on the vacuum base plate is equipped
with a vacuum valve which can be used to release the
vacuum. Check the condition of the seal on the vacuum
base plate at regular intervals and replace it if found to
be worn or damaged.
1. Turn the four leveling screws back until they project
approx. 5 mm beneath the vacuum base plate.
2. Connect the hose between the vacuum base plate and
the vacuum pump.
3. Position the drill stand on the vacuum base plate.
4. Fit and tighten the screw and washer provided.
5. Mark the center point of the hole to be drilled.
6. Draw a line approximately 311/2˝ (800 mm) in length
from the center mark toward the approx. position at
which the drill stand is to be secured.
7. Make a mark on the 311/2˝ (800 mm) line at a distance
of 61/2″ (165 mm) from the hole center mark.
8. Bring the marks on the vacuum base plate into align-
ment with the 311/2˝ (800 mm) line.
9. Position the center of the front edge of the vacuum
base plate on the line at the 61/2″ (165 mm) mark.
-CAUTION- Make yourself familiar with information con-
tained in the operating instructions for the vacuum pump
and follow these instructions before using the vacuum
pump.
10. Switch on the vacuum pump and press the vacuum
release valve.
VACUUM
VACUUM
en
8
11. Once the drill stand has been positioned correctly,
remove your finger from the vacuum release valve
and press the base plate against the work surface.
-CAUTION- Before beginning drilling and during oper-
ation, it must be ensured that the pressure gauge pointer
remains within the green area.
12. Use the four leveling screws to level the vacuum
base plate. The 2 built-in level indicators on the car-
riage serve as leveling aids.
-WARNING- Do not attempt to level the anchor base
plate on the vacuum base plate as this is not possible.
13. An additional means of securing the drill stand must
be employed when drilling horizontally (e.g. a chain
attached to an anchor, ...)
14. Check that the drill stand is fastened securely.
5.1.5 Adjusting the angle of the drill stand
(adjustable to max. 45°) 
-CAUTION-
Take care to avoid pinching your fingers at the pivot.
Wear protective gloves.
1. Release the screw at the pivot at the lower end of the
column and at the strut at the top end.
2. Bring the column into the desired position. The angle
scale on the rear serves as an adjustment aid.
3. Retighten the two screws securely.
5.1.6 Using the column extension (accessory) 
1. Remove the end cap (with built-in end stop) from the
top end of the column and refit it to the end of the col-
umn extension.
2. Fit the cylindrical section of the column extension into
the end of the column on the drill stand.
3. Secure the column extension by tightening the eccen-
tric locking bolt.
4. A depth gauge (accessory) may be fitted on the col-
umn as an additional end stop.
5. After detaching the column extension, the end cap
must be refitted to the drill stand in order to retain the
safety-relevant function of the end stop.
5.1.7 Fitting the spacer (accessory) 
-NOTE-
The distance between the drilling axis and the drill stand
must be increased by fitting the spacer when diamond
core bits with a diameter greater than 12˝ (300 mm) are
to be used. The hole center indicator cannot be used in
conjunction with the spacer. A maximum of 2 spacers
may be fitted, one behind the other. These instructions
presume that the machine is not already fitted.
1. Lock the carriage in position on the column (activate
the carriage locking mechanism).
2. Pull out the machine locking bolt.
3. Fit the spacer onto the carriage.
4. Push the locking bolt into the carriage as far as it will
go.
5. Tighten the locking bolt securely.
5.1.8 Mounting the machine on the drill stand 
-CAUTION-
Overhead drilling with the drill stand
fastened by vacuum is not permissible.
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Ensure that the machine is disconnected from the elec-
tric supply.
1. Lock the carriage in position on the column (activate
the carriage locking mechanism).
2. Pull out the machine locking bolt.
3. Fit the machine onto the carriage or spacer.
4. Push the locking bolt into the carriage or spacer as
far as it will go.
5. Tighten the locking bolt securely.
6. Clip the supply cord into the supply cord guide on the
carriage cover.
7. Check that the machine is mounted securely.
5.1.9 Connecting the water supply
-NOTE-
Before operating the machine, check that the 3-way valve
is in the wet or dry drilling position.
1. Connect the water supply hose to the machine.
2. Connect the hose to the water supply (hose coupling).
-NOTE-
A water flow indicator (accessory) can be connected
between the water supply hose and the hose connector
on the machine.
-CAUTION-
Check the hoses for damage at regular intervals and
make sure that the maximum permissible water supply
pressure of 6 bar is not exceeded.
5.1.10 Fitting the water collector system
(accessory) 
-NOTE-
Use of the water collector system permits water to be
drained away from the core bit thus avoiding soiling the
surrounding area. We recommend use of the water col-
lector system with core bits of up to 10˝ (250 mm). diam-
eter. Best results are achieved in conjunction with a wet-
type vacuum cleaner.
The drill stand must be set up at 90° to the working sur-
face.
The water collector seal must be of a size suitable for
the core bit diameter used.
1. Release the screw at the column pivot (at the front
lower end of the drill stand column).
2. Slide the water collector holder into place behind the
screw from below.
3. Tighten the screw securely.
4. Fit the water collector between the two moveable arms
of the water collector holder.
5. Secure the water collector by way of the two screws
on the water collector holder.
6. Connect a wet-type industrial vacuum cleaner to the
water collector or fit a length of hose through which
the water can drain away.
5.1.11 Adjusting the depth gauge (accessory)
1. Turn the hand wheel until the core bit contacts the
material in which the hole is to be drilled.
2. Set the desired drilling depth by adjusting the distance
between the carriage and the depth gauge.
3. Secure the depth gauge by tightening the clamping
screw.
5.1.12 Fitting a diamond core bit (machine with
Hilti BL chuck) 
-CAUTION-
The core bit may become hot during use or during sharp-
ening. Wear protective gloves when changing the core
bit.
-CAUTION-
Fitting and positioning the core bit incorrectly can lead
to hazardous situations as parts can break and fly off.
Check that the core bit is seated correctly.
1. Lock the carriage in position on the column (activate
the carriage locking mechanism) and check that the
drill stand is fastened securely.
2. Open the chuck by turning it in the direction of the
“open” symbol (open brackets).
3. Push the connection end of the diamond core bit into
the chuck on the machine from below until it engages
with the gear teeth.
4. Close the chuck by turning it in the direction of the
“closed” symbol (closed brackets).
5. Check that the diamond core bit it is held securely
(check by hand for play and try to pull it away from
the chuck).
5.1.13 Selecting the drilling speed 
Select the switch position according to the core bit dia-
meter to be used.
Core bit speed (r.p.m.) can be adjusted while the machine
is in operation.
5.2 Transport and storage
-CAUTION-
Transport the machine, drill stand and diamond core bit
as separate units.
Use the wheel assembly (accessory) to facilitate transport.
Open the water flow regulator before storing the machine.
Especially at temperatures below freezing, take care to
ensure that no water remains in the machine (see also
section 6.10).
5.3 Use of extension cords
Use only extension cords of a type approved for the
application and with conductors of adequate cross sec-
tion.
Mains voltage Conductor cross section
mm2/ AWG
Conductor cross
section 1.5 / 15 2.0 / 14 2.5 / 13 3.5 / 12 4.0 / 11
240 V 20 m /– 40 m /50 m /60 m /
66 ft 131 ft 164 ft 197 ft
Do not use extension cords with 1.25 mm2or 16 AWG
conductor cross sections.
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-DANGER-
Have the earth/ground conductor in the electric supply
and the earth/ground connection to the machine checked
at regular intervals in order to ensure that they are func-
tioning correctly.
-CAUTION-
The machine and the core drilling operation emit noise.
Wear ear protection.
-CAUTION-
The core drilling operation may cause hazardous frag-
ments to fly off. Wear eye protection and a hard hat.
6.1 Switching on the GFCI ground fault interrupter
(DD 350)
-CAUTION-
1. Plug the machine supply cord into an electric socket
with earth connection.
2. Press the “ON” button on the GFCI ground fault inter-
rupter. (The indicator must light)
3. Press the “TEST” button on the GFCI ground fault
interrupter. (The indicator must go out).
-DANGER-
If the indicator continues to light, further operation of
the machine ist not permissible. Have the machine repair-
ed by a qualified specialist using genuine Hilti spare parts.
4. Press the “ON” button on the GFCI ground fault inter-
rupter again. (The indicator must light)
6. Operation
6.2 Core bit diameters and corresponding gears
DD 350
Gear Core bit diameter Speed under no load
1 52–62 mm / 2˝–23/8˝ 667
2 72–92 mm / 23/4˝–31/2˝ 667
3 102–112 mm / 4˝–41/2˝ 667
4 122 mm / 43/4˝ 619
5 127–142 mm / 5˝–51/2˝ 571
6 152–162 mm / 6˝–63/8˝ 524
7 172–182 mm / 63/4˝–7˝ 405
8 202 mm / 8˝ 357
9 225–250 mm / 9˝–10˝ 310
10 300–500 mm / 12˝–20˝ 286
– The operating voltage must be within 5 % and –10 %
of the rated voltage at all times.
– Frequency range 50–60 Hz; max. 65 Hz
– Automatic voltage regulation with starting boost
Never operate other machines or appliances from the
generator or transformer at the same time. Switching
other machines or appliances on and off may cause
undervoltage and/or overvoltage peaks, resulting in dam-
age to the machine.
5.4.2 DD 500
This machine may be powered by a generator or trans-
former which fulfills the following conditions:
– AC voltage, output power at least 10,000 VA
– The operating voltage must be within 5 % and –10 %
of the rated voltage at all times.
– Frequency range 50–60 Hz; max. 65 Hz
– Automatic voltage regulation with starting boost
Never operate other machines or appliances from the
generator or transformer at the same time. Switching
5.3.1 Recommended minimum conductor cross
section and max. cable lengths for the
DD 350
5.4. Use of a generator or transformer
5.4.1 DD 350
This machine may be powered by a generator or trans-
former which meets the following specifications:
– AC voltage, output power at least 7,000 VA
Mains voltage Conductor cross section
mm2/ AWG
Conductor cross
section 1.5 / 15 2.5 / 13
480 V 30 m /75 m /
98 ft 246 ft
5.3.2 Recommended minimum conductor cross
section and max. cable lengths for the
DD 500
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DD 500
Gear Core bit diameter Speed under no load
1 82–92 mm / 31/4˝ – 31/2˝ 571
2 102–112 mm / 4˝ – 41/2˝ 571
3 122–132 mm / 43/4˝ – 51/4˝ 571
4 142–172 mm / 51/2˝–63/4˝ 571
5 182–202 mm / 7˝–8˝ 510
6 225–250 mm / 9˝–10˝ 429
7 300 mm / 12˝ 367
8 350 mm / 14˝ 327
9 400 mm / 16˝ 286
10 450–600 mm / 18˝–24˝ 265
6.3 Operating the machine without the water
collector system and wet-type vacuum cleaner
-CAUTION-
The water flows away in uncontrolled fashion.
6.3.1 Switching on the drilling system 
1. Open the water flow regulator slowly until the desired
volume of water is flowing.
2. Check that the core bit is not in contact with the base
material.
3. Press the ON switch on the machine.
4. Release the carriage lock while holding the handwheel
securely.
5. Turn the hand wheel until the core bit comes into con-
tact with the material in which the hole is being drilled.
6. Apply only light pressure until the core bit has become
centered and then gradually increase the pressure.
7. Regulate the pressure applied to the core bit by observ-
ing the drilling performance indicator (optimum drilling
performance is achieved when the green lamps in the
display light).
6.3.2 Using drilling-starting mode
-NOTE-
Strong vibration may occur when starting the drilling
process. In this case, use drilling-starting mode.
1. Press the ON switch on the machine.
2. Press the ON switch a second time. The core bit then
rotates very slowly.
3. Press the core bit firmly against the surface where
the hole is to be drilled.
4. After a short time in drilling-starting mode (approx.
5 sec.), press the ON switch again. The core bit then
rotates at the normal running speed. Continue drilling
in the usual way.
6.3.3 Procedure when drilling through a rebar
-NOTE-
Slower drilling progress can be an indication of rebar
contact.
The following procedure is recommended when drilling
through a rebar:
1. Press the Iron Boost button.
2. Press the Iron Boost button again when the rate of
drilling progress increases, indicating that the core
bit is through the rebar and drilling only into concrete.
The Iron Boost is then switched off.
-NOTE-
Use the Iron Boost for drilling in heavily reinforced con-
crete. Switch the Iron Boost off each time after drilling
through rebars in order to avoid reducing core bit life
unnecessarily.
6.4 Operating the drilling machine with the water
collector system (accessory)
-NOTE-
Use of the water collector system while drilling at an
angle is not possible. The water is allowed to flow away
through a length of hose.
-CAUTION-
Check that the core bit and water collector are centered
in relation to each other. The core bit fills with water dur-
ing overhead drilling.
6.4.1 Switching on 
1. Open the water flow regulator slowly until the desired
volume of water is flowing.
2. Check that the core bit is not in contact with the base
material.
3. Press the ON switch on the machine.
4. Release the carriage lock while holding the handwheel
securely.
5. Turn the hand wheel until the core bit comes into con-
tact with the material in which the hole is being drilled.
6. Apply only light pressure until the core bit has become
centered and then gradually increase the pressure.
7. Regulate the pressure applied to the core bit by observ-
ing the drilling performance indicator (Power Controls).
Optimum drilling performance is achieved when the
green lamps in the display light.
6.5 Operating the drilling machine with the water
collector system and wet-type vacuum cleaner
(accessory)
-NOTE-
Use of the water collector system while drilling at an
angle is not possible.
The water is allowed to flow away through a length of
hose.
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12
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The wet-type vacuum cleaner must be switched on man-
ually before beginning drilling and switched off manu-
ally at the end of the drilling operation.
-CAUTION-
Check that the core bit and water collector are centered
in relation to each other.
The core bit fills with water during overhead drilling.
6.5.1 Switching on 
1. Switch on the wet-type vacuum cleaner. Do not use
automatic mode.
2. Ensure that the water supply is connected and ready
for use.
3. Open the water flow regulator.
4. Check that the core bit is not in contact with the base
material.
5. Press the ON switch on the machine.
6. Release the carriage lock while holding the handwheel
securely.
7. Turn the hand wheel until the core bit comes into con-
tact with the material in which the hole is being drilled.
8. Apply only light pressure until the core bit has become
centered and then gradually increase the pressure.
9. Regulate the pressure applied to the core bit by observ-
ing the drilling performance indicator (optimum drilling
performance is achieved when the green lamps in the
display light).
6.6 Dry drilling
-NOTE-
The 3-way valve must be in the dry drilling position.
To collect the dust, use a suitable dust removal system
consisting of the following listed accessories: water col-
lector ring and seal of the appropriate diameter, hose
connector and industrial vacuum cleaner. The dust
removal process must be assisted by applying a flow of
compressed air through the core bit (flow rate at least
30 l/s).
Wear a breathing mask if the work creates dust.
1. Remove the water outlet cap.
2. Start the water flow (required for motor cooling).
3. Allow the cooling water to flow away through the
drainage hose.
4. Switch on the vacuum cleaner and compressed air.
5. Check that the core bit is not in contact with the base
material.
6. Press the ON switch on the machine.
7. Release the carriage lock while holding the hand-
wheel securely.
8. Turn the hand wheel until the core bit comes into
contact with the material in which the hole is being
drilled.
9. Apply only light pressure until the core bit has become
centered and then gradually increase the pressure.
10. Regulate the pressure applied to the core bit by
observing the drilling performance indicator (Power
Controls). Optimum drilling performance is achieved
when the green lamps in the display light).
6.7 Switching off 
1. Switch off the machine.
2. Withdraw the diamond core bit from the hole.
-CAUTION-
Exercise caution when drilling overhead: The core bit
fills with water.
3. Engage the carriage lock.
4. Close the water flow regulator.
5. Switch off the vacuum cleaner, if used.
6. After drilling overhead, the water must be drained
from the core bit. To do this, remove the water outlet
cap, attach a drainage hose (accessory) to the water
ontlet and then turn the 3-way valve to the middle
position. Keep the water away from the machine.
7. To ensure that the drill stand remains in balance, lower
the core bit until in contact with the working surface
or fold out the hole center indicator (this is not effec-
tive if using the vacuum base plate).
8. Unplug the supply cord or switch off the GFCI.
9. Remove the core.
-CAUTION-
The core may be very heavy.
6.8 Procedure in the event of the core bit sticking
The slip clutch will be activated if the core bit sticks. The
machine must then be switched off by the operator. To
release the core bit, proceed as follows:
Using an open-end wrench to release the core bit
1. Disconnect the supply cord plug from the power outlet.
2. Grip the core bit close to the connection end with a
suitable open-end wrench and rotate the core bit to
release it.
3. Plug the supply cord back into the power outlet.
4. Continue the drilling operation.
Using the spider wheel to release the core bit
1. Disconnect the supply cord plug from the power outlet.
2. Release the core bit by rotating it with the spider wheel.
3. Plug the supply cord back into the power outlet.
4. Continue the drilling operation.
6.9 Removing the machine from the drill stand 
-CAUTION-
Ensure that the machine is disconnected from the mains
supply.
1. Lock the carriage in position on the column (activate
the carriage locking mechanism).
2. Hold the machine securely with one hand on the car-
rying grip. (-CAUTION- The machine may fall if not
held securely.)
3. Release the machine eccentric locking bolt with the
other hand.
4. Pull out the eccentric locking bolt.
5. Remove the machine from the carriage.
6. Push the eccentric locking bolt back into the carriage
as far as it will go.
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7. Maintenance
-CAUTION-
Disconnect the supply cord plug from the socket.
-CAUTION-
Keep the machine, especially its grip surfaces, clean and
free from oil and grease. Do not use cleaning agents
which contain silicone.
Care of insert tools and metal parts
Remove any dirt adhering to parts and rub the core bits
and the chuck with an oily cloth from time to time to pro-
tect their surfaces from corrosion.
7.1 Care of the machines
The outer casing of the machine is made from impact-
resistant plastic. Clean the outside of the machine at reg-
ular intervals with a cloth. Do not use water spray or
steam pressure equipment for cleaning. This may neg-
atively affect the electrical safety of the machine.
7.2 Maintenance
Check all external parts of the machine for damage at
regular intervals and check that all controls operate fault-
lessly. Do not operate the machine if parts are damaged
or when the controls do not function faultlessly. If nec-
essary, the machine should be repaired at a Hilti repair
center.
Repairs to the electrical section of the machine may be
carried out only by trained electrical specialists.
7.4 Adjusting the play between the column and the
carriage 
The play between the column and the carriage can be
adjusted by way of 4 eccentrically-mounted rollers.
The 4 rollers shown in the illustration can be adjusted.
First remove the machine from the drill stand and run
the carriage up to the top of the column by turning the
hand wheel. The 4 rollers can then be adjusted as follows:
1. Use a 5 mm AF hex. socket wrench to unscrew the
locking screw slightly (do not remove the screw).
2. Use a 19 mm AF open-end wrench to turn the eccen-
tric axle, thus pushing the roller slightly toward the
column.
3. Tighten the locking screw.
4. Test: When adjusted correctly, the carriage alone will
remain in position (not slide down). With the machine
mounted on it, the carriage should slide down under
its own weight.
7.5 Checking the equipment after care and
maintenance
All functions must be checked after care and mainte-
nance.
7.3 Indicator lamps
Service indicator
Overheating
Overvoltage/
undervoltage
Status
Lights constantly
Blinks
Continues to blink
Lights constantly
Blinks
Recommendation
Return the machine to Hilti for servicing.
Fault in the machine (see "Troubleshooting")
Return the machine to Hilti urgently for
servicing (failure to observe this recommen-
dation may reduce entitlement to the services
provided by optional Hilti Full Service.)
Check the water flow.
Check the electric supply (see "Trouble-
shooting").
8. Accessories
Water flow indicator
DD-HD30 drill stand
Depth gauge
Water collector holder
Column extension, 3.28 ft (1 m)
Column extension, 0.98 ft (0.3 m)
305939
305534
305535
305536
305537
285296
6.10 Storing and break times in sub-zero temperatures
-CAUTION-
If break times are longer than one hour when working
at temperatures below 32°F (0°C) or if the machine is
to be stored at such temperatures, the water in the sys-
tem must be blown out with compressed air.
1. Disconnect the water supply hose from the machine.
2. Open the water flow regulator.
3. Set the 3-way valve to the wet drilling position.
4. Use compressed air (max. pressure 3 bar) to blow all
water out of the system.
6.11 Disposing of drilling slurry
see Section 10 “Disposal”
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9. Troubleshooting
Fault
The machine doesn’t start
The machine doesn't start
and the temperature/over-
voltage/undervoltage
warning lamp lights.
The machine doesn’t start
and the service indicator
blinks.
The machine runs and the
service indicator lights.
The machine runs and the
service indicator blinks.
Remedy
Plug in another electric appliance and check
whether it works. Check the plug connec-
tions, electric supply, GFCI (DD 350) and fuse
in the electric supply.
Have it checked by a trained electrical spe-
cialist and replaced if necessary.
Have the machine repaired at a Hilti service
center.
Switch the machine off (press the OFF switch
in the middle) and then switch on again.
Check the water supply. Allow the machine to
cool down before restarting.
Switch the machine off (press the OFF switch in
the middle) and then switch on again. Have the
machine serviced by Hilti if the fault persists.
Return the machine to Hilti for servicing.
Servicing urgently required. Return the
machine to Hilti.
Possible cause
Fault in the electric supply
Supply cord or plug defective.
Switch defective.
Machine has overheated.
The machine is faulty or a safety
cut-out has been activated.
Service interval reached.
Service interval exceeded.
Vacuum base plate
Vacuum pump
Spacer
Wheel assembly
Clamping spindle
Clamping spindle M16
Clamping nut
Anchor HDI 5/8"
Water collector 8–87 (with seal, also suitable for dry drilling)
Water collector 25–152 (with seal, also suitable for dry drilling)
Water collector 92–250 (with seal, also suitable for dry drilling)
Chuck, BS/BR
Chuck, BL
Chuck, Pixie
Adaptor BU ➝BL
Adaptor BL ➝BU
Adaptor BS ➝BL
Adaptor BL ➝BS/BR
Adaptor BL ➝Pixie
Extension DD-BS-ET 200 S (steel)
Extension DD-BS-ET 500 S (steel)
Extension DD-BS-ET 300 S (aluminium)
Extension DD-BS-ET 500 S (aluminium)
Core bit extension BL 12˝ (300 mm)
Cross-column adaptor
Drainage hose
Connector (for dry drilling)
Vacuum cleaner (for dry drilling, e.g. Hilti VCU 40, VCD 50)
305538
332158
305539
305541
305940
220947
251834
336428
232204
232221
232243
305904
282987
305905
305909
282989
284891
305910
283982
202898
202899
202900
202901
305903
305540
202992
46938
000000
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15
The motor runs, core bit
doesn’t rotate.
Rate of drilling progress
decreases.
The motor cuts out.
Water leakage at the
water swivel or gear
housing.
The diamond core bit
cannot be fitted into the
chuck.
Water leakage at the
chuck during operation.
Excessive play in the
drilling system.
Gearing defective.
Diamond core bit segments
polished.
Diamond core bit segments
polished.
Water pressure / water flow rate
too high.
The core is stuck in the core bit.
Maximum drilling depth reached.
The diamond core bit is defec-
tive.
Gearing defective.
The clutch is releasing prema-
turely or slipping.
The core bit has been jammed
(stalled) for too long.
Electric power failure.
Electronics defective.
Shaft seal defective.
Water pressure is too high.
Chuck or connection end dirty or
damaged.
Core bit not screwed securely
into the chuck.
Chuck or connection end dirty.
Chuck seal or core bit connection
end defective.
Screws at the top end of the strut
and/or at the column pivot are
loose.
Core bit not screwed securely
into the chuck.
The machine mounting/locking
mechanism is loose.
Leveling screws or clamping
spindle not tightened.
Excessive play at the carriage.
Excessive play at the chuck.
Connection end defective.
Chuck not fitted correctly.
Not securely fastened to the base
material.
Have the machine repaired at a Hilti service
center.
Sharpen the core bit on a sharpening plate
while water is flowing.
The wrong core bit specification has been
used. Seek advice from Hilti.
Use the regulator to reduce the water flow
rate (a minimum flow rate of 0.5 l/min. must
be maintained).
Remove the core.
Remove the core and use a core bit
extension.
Check the diamond core bit for damage and
replace it if necessary.
Have the machine repaired at a Hilti service
center.
Have the machine repaired at a Hilti service
center.
Free the core bit. Switch the motor off and
then on again.
Check the plug connections, electric supply,
GFCI (DD 350) and fuse in the electric
supply.
Have the machine repaired at a Hilti service
center.
Have the machine repaired at a Hilti service
center.
Reduce the water pressure.
Clean the connection end/chuck or replace if
necessary.
Tighten it securely.
Clean the chuck or connection end.
Check the seal and replace it if necessary.
Tighten the screws.
Tighten it securely.
Tighten the machine mounting/locking
mechanism.
Tighten the leveling screws or clamping
spindle.
Adjust the play at the carriage guide rollers.
Check that the chuck runs true and replace it
if necessary.
Check the connection end and replace it if
necessary.
Fit the chuck as far as it will go and tighten
the hex. socket screw to a torque of 35 Nm.
Check the fastening and adjustment of the
leveling screws.
Printed: 08.07.2013 | Doc-Nr: PUB / 5145291 / 000 / 01