17
English
HAMMER DRILLING IN CONCRETE OR
BRICK
Caution: Stone drills can get very
hot.
It may be necessary to drill with smaller bits
and re-drill to nominal size so that later the
plug is firmly seated.
For large bores, for instance in very hard
concrete, use a smaller bit for pilot drilling
and re-drill to nominal size .
Do not apply a lot of pressure on the
machine, let the machine do the work, guid-
ing the machine with light pressure is
sufficient.
Hold the machine with the auxiliary handle,
the bit can jam, particularly with deep bores,
and the machine will turn .
MAINTENANCE
Take care that the machine is not
connected to power whenever
maintenance work on the
mechanical parts is taking place.
These machines are designed to function
problem-free for a long period with a mini-
mum of maintenance . Through regular
cleaning and correct treatment, you help
assure a long working life for your machine .
Defects
The machine should be regularly inspected
for the following possible defects, and
repaired if necessary .
• Damage to power cord
• Broken on/off trigger assembly.
• Short circuiting .
• Damaged moving parts .
Trouble shooting
1. When switched on, the motor does
not turn
• Failure in power supply .
• Check the power supply.
• Poor contact in the on/off trigger.
• Repair or replace the trigger assembly.
• Mains voltage too low .
• Extension lead too long, or too light.
• Damaged motor .
• Have your machine repaired by an
expert.
• Carbon brushes worn .
• Replace the carbon brushes.
2. Motor generates excessive noise,
and runs too slowly or not at all
• Motor is overloaded due to excessive
pressure or drilling depth .
• Reduce the pressure or drilling depth,
reduce power.
• Damaged motor .
• Have your machine repaired by an
expert.
• Supply voltage too low .
• Adjust the supply voltage.
• Carbon brushes worn .
• Replace the carbon brushes.
3. Overheating in the transmission case
• Overloading of machine, or blunt drill bit
• Reduce the loading, or hone the drill
bit.
• Reduced voltage .
• Adjust the supply voltage.
4. Heavy sparking from the motor
• Inspect the carbon brushes for wear .
Cleaning
Clean the machine casings regularly with a
soft cloth, preferably after each use . Make
sure that the ventilation openings are free of
dust and dirt . Remove very persistent dirt
using a soft cloth moistened with soapsuds .
Do not use any solvents such as gasoline,
alcohol, ammonia, etc . Chemicals such as
these will damage the synthetic
components .
Faults
Should a fault occur, e .g . after wear of a
part, please contact the service address on
the warranty card. Separate you find an
exploded view showing the parts that can
be ordered .
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