30
english
2. Adjust the water flow as necessary.
3. Proceed as described above.
WARNING:
If any water comes out
of the drainage hole at the gear neck,
stop the work immediately and have the
machine repaired by an authorized repair
agent.
MAINTENANCE
Your
D
e
WALT
power tool has been designed to
operate over a long period of time with a minimum
of maintenance. Continuous satisfactory operation
depends upon proper tool care and regular
cleaning.
WARNING: To reduce the risk of
injury, turn unit off and disconnect
machine from power source before
installing and removing accessories,
before adjusting or changing set-
ups or when making repairs.
Be sure
the trigger switch is in the OFF position.
An accidental start-up can cause injury.
Regularly take the tool to an authorized repair
agent for inspection. This includes checking the
carbon brushes, topping up oil in the gearcase and
replacement of the gearcase sealing ring.
Troubleshooting
If your tool seems not to operate properly, follow
the instructions below. If this does not solve the
problem, please contact your repair agent.
Core bit does not cut
Material too hard for core bit
• Choose a more appropriate core bit
(with softer segments).
• Apply wet drilling when appropriate.
Segments look glazed and polished
• Drill in abrasive material to re-expose diamond
segments.
Evacuated water too clear and too fluid
Water flow slows down the cutting action and
prevents the diamond segments to self-sharpen.
• Reduce water flow.
Rotating speed not appropriate
• Refer to the technical data for proper speed
ratings.
Dust accumulating in core bit
Accumulating dust slows down the drilling speed.
• Use the appropriate dust extraction device.
•
Always observe the safety instructions
and applicable regulations.
• Be aware of the location of pipework
and wiring.
• Apply only a gentle pressure to the tool.
Excessive force does not speed up
drilling but decreases tool performance
and may shorten tool life.
Proper Hand Position (fig. 6)
WARNING:
To reduce the risk of serious
personal injury,
ALWAYS
use proper
hand position as shown.
WARNING:
To reduce the risk of serious
personal injury,
ALWAYS
hold securely in
anticipation of a sudden reaction.
Proper hand position requires one hand on the top
of the drill stand, with the other hand on the stand
handle.
Switching On and Off (fig. 1)
To switch the tool on, set the on/off switch (A) to
position I.
To switch the tool off, set the on/off switch (A) to
position 0.
General Tips for Drilling with
Diamond Core Bits
WARNIING
: Follow the core bit or
manufacturer's recommendations for
using the accessory.
NOTE:
The use of a centredrill is not necessary.
1. Switch on the drill motor.
2. Slowly feed the accessory into the workpiece
using the feed handle.
3. At the start of the cut, apply light pressure
to allow the accessory to perform the initial
groove.
4. Continue applying sufficient pressure to achieve
a smooth progressive cut. Do not force.
5. Take extra care when the accessory is about to
break through the surface to prevent splintering.
6. Always switch off the tool when work is finished
and before unplugging.
WARNING
: Do not mix or stir
inflammable liquids labelled accordingly.
Wet Drilling
1. Connect the machine to an appropriate water
supply system.
