Hilti DD 350, Manual

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English 35
2. Set the 3-way valve on the core drilling machine to dry drilling .
3. Press the ON switch on the diamond core drilling machine.
4. Release the carriage lock.
5. Turn the hand wheel until the core bit is in contact with the base material.
6. When you start drilling apply only light pressure until the core bit has centered itself. Then apply more
pressure.
7. Watch the drilling performance indicator and adjust contact force accordingly.
5.2.7 Switching off the diamond core drilling machine
WARNING
Risk of personal injury and material damage The diamond core bit fills with water during overhead
drilling. The diamond core drilling machine may become damaged and the risk of electric shock is
increased.
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As a first step, carefully allow the water to drain away after completing overhead drilling. This is
done by disconnecting the water supply from the water flow regulator and draining the water by
opening the water flow regulator. Do not allow the water to run over the motor and cover.
1. If the following conditions are met, also take this action:
Conditions : Drilling upward
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Set the 3-way valve to the middle position to drain the water from the core bit.
2. Remove the diamond core bit from the hole.
3. Switch off the diamond core drilling machine.
4. Lock the carriage on the rail with the carriage lock.
5. Switch off the wet-type industrial vacuum cleaner, if used.
5.2.8 Procedure for dealing with a jammed core bit
If the bit jams the safety clutch disengages. Then the motor switches off.
The step-by-step procedure for releasing the core bit is as follows:
5.2.8.1 Releasing the core bit
1. Unplug the supply cord from the power outlet.
2. If the following conditions are met, also take this action:
Conditions : Releasing with open-ended wrench
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Release the core bit by engaging an open-ended wrench close to the connection end.
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Release the core bit by turning it.
3. If the following conditions are met, also take this action:
Conditions : Releasing with hand wheel
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Release the core bit from the base material by turning the hand wheel.
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Check that the carriage is locked by lightly turning the hand wheel.
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Plug the supply cord of the diamond core drilling machine into the power outlet.
4. Plug the supply cord of the diamond core drilling machine into the power outlet.
5. Continue the drilling operation.
5.2.9 Removing the diamond core bit 16
1. Unplug the supply cord from the power outlet.
2. Lock the carriage on the rail.
3. Check that the carriage is locked by lightly turning the hand wheel.
4. Open the chuck by turning it in the direction indicated by the open brackets symbol.
5. Remove the core bit.
5.2.10 Removing the diamond core drilling machine 17
1. Lock the carriage on the rail with the carriage lock. Check to ensure that it is securely fastened.
2. Hold the diamond core drilling machine securely with one hand on the carrying grip.
3. Release the eccentric pin in the lock of the diamond core drilling machine.
4. Pull out the eccentric pin.
Printed: 02.11.2017 | Doc-Nr: PUB / 5145256 / 000 / 04