DUSS DIA 303 S User manual

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www.duss.de
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Translation of the DIA 303 S original operating instructions
Components and control elements
1 · Holder for auxiliary handle
2 · Adjusting dial for speed and impact force
3 · Trigger lock for pushbutton switch
4 · Pushbutton switch on/off
5 · Overload and service indicator
6 · Swivelling side handle
7 · Gear shift lever
8 · Change lever drilling/drilling with soft impact
Applications
The DIA 303 S diamond core drill is suitable for dry diamond core
drilling with dust extraction into all types of masonry, concrete and
Operating instructions
DIA 303 S diamond core drill
Technical data DIA 303 S
Power input 2000 W
Voltage 230 V
Current input 9.4 A
Frequency 50 - 60 Hz
Machine weight 6.9 kg
Speed / impact force under load
1. gear 420 - 530 rpm / 8480 - 10600 impacts/min
2. gear 660 - 830 rpm / 13280 - 16600 impacts/min
3. gear 900 - 1130 rpm / 18080 - 22600 impacts/min
Drilling range with diamond core bit 52 - 250 mm
1. gear dia. 137 - 202 mm (250 mm in masonry)
2. gear dia. 102 - 137 mm
3. gear dia. 52 - 102 mm
Max. drilling range 250 mm
Chuck G 1/2" external thread
Switchable soft impact
Permanent lubrication
Swivelling side handle and screw-in auxiliary handle
Pushbutton switch on/off with trigger lock, ensuring non-fatiguing work
Safety clutch
Electronic for constant speed and impact force control, full load speed = no load speed
Speed and impact force infinitely adjustable with adjusting dial
Electronic overload indicator
Service indicator
Self disengaging carbon brushes
EN 62841 Class II device
Interference-suppresses in accordance with EN 55014
reinforced concrete. Concrete and reinforced concrete must only be
drilled with soft impact. The user is solely responsible for damages
which result from improper use.
Electrical connection
To prevent the machine from being started unintentionally during
care, maintenance or repair operations, and before replacing the
tool, unplug the machine at the mains socket.
The machine is a Class II device and is totally insulated. For this
reason, the housing must never be grounded or drilled with holes, it
must never be used if damaged, and it must always be kept dry. The
voltage indicated on the rating plate must agree with the power supply
voltage. Only use the extension lead with sufficient section approved
Specifications subject to change

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Translation of the DIA 303 S original operating instructions
Dust extraction
Dry diamond drilling must always be carried out with dust
extraction. It is necessary that the suction holes around the chuck on
the diamond drill bit are open and that the industrial vacuum cleaner
is attached to the SK suction head. The extraction system not only
enables almost dust-free drilling, but also ensures increased drilling
progress, a longer service life of the diamond core bit and optimum
cooling of the diamond segments. Drilling without dust extraction
damages the diamond segments due to overheating. An industrial
vacuum cleaner with filter cleaning and according to valid directives
(BGIA dust class M) must be used. To achieve a good suction
performance, the industrial vacuum cleaner must be cleaned at regular
intervals.
Hand-held, with centring
Before drilling, a pilot drill hole with drilling dia. 14 mm, by approx.
8 cm deep, must be drilled in the centre of the planned drill hole.
This serves to guide the supplied ZST centring rod, which should be
inserted into the chuck or extension. For pilot drilling with the ZST
centring rod inserted, drill to a depth of approx. 2 cm with the tool,
switch off the machine, remove the ZST centring rod and continue
drilling.
When using the optional SZ quick centring bit, adapted to the tool
length, the pilot drilling is not necessary.
A wooden plate with sawn-in prism in which the core bit is guided can
also serve as a centring aid.
Stand mounted
The machine can be fixed in the BS 160 drill stand (up to max. drilling
range 202 mm) with the mounted side handle (6). For stand mounted
dry drilling, the TBS dry extraction system (optional) must also be
mounted between the chuck and the diamond core bit. This must be
lubricated from time to time with dry lubrication spray.
For easy pilot drilling, attach the optional BS 160-ABH centring aid to
the drill stand (necessary for large diameters).
Drilling
Work with sufficient contact pressure when drilling without soft
impact. If it is too low, the diamonds tend to polish. In this case, the
drilling progress becomes less and less until finally no more material
is removed. This can only be corrected by briefly drilling in the SP
sharpening plate.
Drilling with soft impact
Select moderate contact pressure when drilling with soft impact, let the
core bit „work“ in conjunction with the soft impact. Especially as soon
as reinforcement is drilled through in order to reduce vibrations.
Ergonomic work
A holder (1) is located on the power tools switch handle, into which an
auxiliary handle (included in the scope of delivery) can be screwed in.
This ensures a comfortable, back-saving posture when working down-
wards (compressor setting).
Overload indicator
The overload indicator (5) is located at the lower part of the switch
handle and serves to check the machine load. The display of the
different operating modes is done by means of a green LED light.
Functional description
Continuous green light:
Unit switched on and machine load is low to optimum.
Flashing green light, slow:
Machine is overloaded, the contact pressure must be reduced.
Flashing green light, fast: 
Machine has reduced speed due to overload. The contact pressure
must be reduced.
Green light went out:
Machine has switched off due to overload and must be switched off
and on again. Alternatively, the machine is not switched on.
for the field of application.
Inserting and changing tools
The chuck of the diamond core drill with G 1/2" external thread is
located on the drilling spindle. Only use suitable and high-quality tools.
Use cutting tools with good cutting properties. When using diamond
core bits, ensure that the diamond segments still protrude sufficiently
from the core bit tube on the inner and outer diameter. Before mounting
the tool, apply a small amount of dry lubricant spray to the mounting
system.
Loosen the clamping ring of the SK suction head and move it to the
rearmost position. Screw the diamond core bit onto the drill spindle
and tighten it with the enclosed open-end wrench.
Gearshift
The machine features a 3-speed-gearbox, which allows the optimum
speed to be set for each drilling diameter. The preselection of the
speed is made at the gear shift lever (7). Never change gears with force
and only when the machine is running down or stopped. If the gear
lever cannot be moved to the desired position when the machine is at a
standstill, briefly touch the pushbutton switch (4) at the same time. The
recommended speeds for each tool are given in the carrying case.
Soft impact
The soft impact can be easily switched on or off using the change lever
(8) located at the bottom of the drill head. The soft impact accelerates
the work progress in hard materials. Concrete and reinforced concrete
should only be drilled with soft impact.
Symbol „drill“ on change lever (8) indicates the position drilling without
soft impact
Symbol „hammer“ on change lever (8) indicates the position drilling
with soft impact
Operation
Always comply with recognized accident prevention regulations
and the accompanying safety precautions. In case of functional
failure, have the machine inspected by a qualified electrician befo-
re continuing work.
Before starting work unplug the machine at the mains socket. Make
sure that the swivelling side handle (6) is firmly screwed in at the
desired position. Always hold the machine with both hands when
working and maintain a firm stance.
Continuous operation: Press the pushbutton switch (4) and depress
the trigger lock (3) upwards.
Switch off: Briefly press the pushbutton switch (4).
Infinitely adjustable speed: Pilot drilling is made easier by reducing
the speed. Afterwards, work should always be continued at full speed
and thus full power.
The adjusting dial (2) is ergonomically arranged to permit this either
before or during work.
+ = full speed
- = reduced speed
Dry drilling
Generak information
Pilot drilling always without soft impact, with low contact pressure.
If the tool jams, do not attempt to release it by switching the machine
on and off. Switch the machine off immediately and release the tool
by turning it clockwise and counterclockwise with a suitable open-end
wrench. Carefully pull the tool out of the drill hole.
When drilling, the adjusting dial (2) should always be set to full speed.
The speed should only be reduced for pilot drilling or sharpening on the
sharpening plate etc.

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www.duss.de Translation of the DIA 303 S original operating instructions
Service indicator
The service indicator (5) is located on the lower part of the switch
handle. If the service indicator lights up red, the running time for a
service has been reached. It is possible to work with the machine for
a few more hours from the time the service indicator starts to light up
but will then switches off automatically. Take the power tool to a DUSS
Service Centre as soon as possible to ensure that its serviceability is
maintained.
Mechanical and electric overload protection
The machine is equipped with a mechanical and an electronic overload
protection.
Mechanical overload protection:
The safety clutch protects the user from injury if the rotating tool
suddenly jams.
Electronical overload protection:
The electronics protect the motor from being overloaded. If the contact
pressure is too high, the speed of the drill bit is reduced. This condition
is cancelled by relieving the drill bit and thus the motor. Motor and drill
bit run at nominal speed again.
If the overload lasts longer than 5 seconds, the motor is switched off
electronically. To continue work, the machine must be switched off
and on again after a waiting period of 2 seconds using the pushbutton
switch. The contact pressure must be adjusted.
Before switching the machine on again, make sure that the drill bit can
be turned easily and does not jam in the drill hole.
Lubrication
The entire machine is permanently lubricated by means of a closed
lubrication system.
Maintenance and care
Caution: Always remove the mains plug from the socket before
starting any maintenance and care work.
Clean the machine after finishing work. Also clean the chuck and apply
some dry lubricant spray. Clean the machine with a dry or damp cloth
and not with a jet of water. Ensure that no water gets into the machine.
Make sure that the ventilation slots are always clean.
Sharpening
Blunt diamond core bits should be sharpened by briefly drilling without
suction at reduced speed and without soft impact in the SP sharpening
plate. Worn or damaged diamond drill bits can be refitted by DUSS
depending on their condition. If a segment breaks off, stop working
immediately, as this will destroy the diamond core bit.
Warranty
The warranty period is 12 months from the date of delivery as shown
on the warranty certificate or invoice. The warranty is valid as long as
the machine has been operated and handled correctly, cleaned and
serviced properly in accordance with the operating instructions and
has not been tampered with by unauthorized persons. The warranty is
limited to the free repair or replacement of parts which become defec-
tive due to production or material faults only. Parts becoming defective
as a result of normal wear or due to tampering by the customer or
others are not covered by this warranty. The warranty is valid only if
genuine DUSS tools, consumables, accessories and spare parts are
used, i.e. only if the technical unit is maintained.
Additional claims are excluded, i.e., DUSS is not liable for direct or
indirect defects or consequential damages, losses or expenses in
connection with the use of, or the inability to use the machine for any
purpose. Implied warranties of usability or suitability for a particular
purpose are excluded.
If a defect is discovered, the machine must be sent immediately to
DUSS or a DUSS customer service centre. All previous written or ver-
bal warranties are superseded by the above warranty obligations.
Service
Repairs may only be carried out by a qualified electrician. Failing this,
the operator may be exposed to the risk of accidents. If a fault occurs,
you are accordingly strongly recommended to return the machine to
the following address
Alternatively send it to a DUSS customer service centre.
Their experienced specialists and special equipment allow them to
rectify faults properly.
The machine is to be returned complete, at the sender’s risk and
expense.
Safety precautions
Read all the safety notes and instructions!
Failure to observe these may cause an electric shock, fire and/or seri-
ous injuries.
Keep the safety notes and instructions for future reference.
Safety precautions
Wear appropriate protective equipment, e.g.
Observe the accompanying safety instructions and the applicable regu-
lations issued by your trade association or similar.
Additional safety precautions
Wear ear protection when impact drilling.
Exposure to noise can cause hearing loss.
Use auxiliary handle supplied with the power tool.
Before starting make sure that the swivelling side handle and the auxi-
liary handle are firmly screwed in at the desired position. Always hold
the machine with both hands when working and maintain a firm stance.
Work concentrated. Loss of control of the power tool can cause perso-
nal injury.
Hold power tool by insulated gripping surfaces, when performing
an operation where the cutting accessory may contact hidden

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Translation of the DIA 303 S original operating instructions
wiring or its own cord.
Cutting accessory contacting a „live“ wire may make exposed metal
parts of the power tool „live“ and could give the operator an electric
shock.
Take protective measures when dust can develop during working
that is harmful to one’s health, combustible or explosive.
Some dusts are regarded as carcinogenic. Wear a breathing mask and
work with dust extraction.
Do not expose power tool to rain or splash water.
Stop working immediately if water is entering the power tool and have
the power tool checked by a qualified electrician. Otherwise the life of
the user may be at risk.
• Before starting drilling work, check that the core bit is correctly
seated on the chuck or, when working with an extension, that the
extension is firmly seated on the drill spindle and the core bit on the
extension.
• Ensure that the drilling does not affect the statics of the building.
• The area around the drilling must be devoid of any electricity cables,
gas, water or other pipes. Any cable or pipes in the area around the
drilling must be disconnected.
• Special safety precautions must be taken for drillings in walls where
the drill stand is fixed by vacuum.
• Ensure that if the drill core drops out, especially in the case of ceiling
breakthroughs, nobody will be injured or damage can occur. If
necessary, install a collecting device and close off the front and rear
drilling area.
• Have the cord and the plug exchanged exclusively by DUSS or a
DUSS customer service.
• Only use DUSS diamond core bits with drilling dia. 52 - 250 mm.
Noise and vibration information
(in accordance with EN 62841)
Typical A-weighted noise levels of the DIA 303 S diamond core
drilling in sand-lime brick, drilling dia. 102 mm:
Noise pressure level: LpA = 97 dB (A)
Noise power level: LWA = 108 dB (A)
Uncertainty: KpA = KWA = 4 dB
Wear ear protection.
Vibration data for the DIA 303 S diamond core drilling in sand-lime
brick, drilling dia. 102 mm:
Normal setting: ah,DD = 2.3 m/s²
Uncertainty: K = 1.5 m/s²
Compressor setting: ah,DD = 3.1 m/s²
Uncertainty: K = 1.5 m/s²
Typical A-weighted noise levels of the DIA 303 S diamond core
drilling with impact in concrete, drilling dia. 82 mm:
Noise pressure level: LpA = 99 dB (A)
Noise power level: LWA = 110 dB (A)
Uncertainty: KpA = KWA = 3 dB
Wear ear protection.
Vibration data for the DIA 303 S diamond core drilling with impact
in concrete, drilling dia. 82 mm:
Normal setting: ah,ID = 14.4 m/s²
Uncertainty: K = 1.5 m/s²
Compressor setting: ah,ID = 15.0 m/s²
Uncertainty: K = 1.5 m/s²
The values given in this instruction have been measured in accordance
with EN 62841 standardised measurement methods and may be used
for comparing power tools with each other. They also may be used
for a preliminary assessment of exposure and represent the main
applications of the power tool. However, if the power tool is used for
other applications or with other accessories or if it is poorly maintained,
the values may differ. This may increase the exposure level over the
entire working period.
For an accurate estimation of the exposure level, the times when the
power tool is switched off or when it is running but not actually in use
should be taken into account. This may reduce the exposure level
over the entire working period. Wear ear protection and take additional
safety measures to protect the operator from the effects of vibration
such as: maintain of the power tool and the accessories, keeping
hands warm, organization of work patterns.
Declaration of Conformity
We declare in our sole responsibility that the DIA 303 S diamond core
drill conforms to the following standards or standardisation documents:
EN 62841-1, EN 62841-2-1, EN 55014-1, EN 55014-2, EN 61000-3-2,
EN 61000-3-3 as per the provisions laid down in Directive 2006/42/EG,
2014/30/EU, 2011/65/EU
The technical documentation is archived at the manufacturer.
FRIEDRICH DUSS
Maschinenfabrik GmbH & Co. KG
75387 Neubulach, Germany
Konrad Duss
General Manager
08/2020