Procedure In The Event Of The Core Bit Jamming; Using The Hand Wheel To Free The Core Bit; Using An Open-End Wrench To Free The Core Bit; Care, Maintenance, Transport And Storage - Hilti DD 150-U Manual De Instrucciones Original

9. After removing the Rota-Rail, refit the end stop screw to the end of the rail.
6.17

Procedure in the event of the core bit jamming

If the bit jams the safety clutch disengages. The electronic control system then switches the motor off and
subsequently on again; this is done twice without manual intervention by the user. If this does not free the
core bit, the electronic control system switches the motor off for 90 seconds. You can free a jammed bit
manually, as follows:

6.17.1 Using the hand wheel to free the core bit

1. Unplug the supply cord from the power outlet.
2. Free the core bit from the base material by turning the hand wheel.
3. Plug the supply cord into the power outlet.
4. Resume the drilling operation.

6.17.2 Using an open-end wrench to free the core bit

1. Unplug the supply cord from the power outlet.
2. Grip the diamond core bit with a suitable open-end wrench close to the connection end and turn the
diamond core bit to free it.
3. Plug the supply cord into the power outlet.
4. Resume the drilling operation.
7

Care, maintenance, transport and storage

7.1

Care and maintenance

WARNING
Electric shock hazard! Attempting care and maintenance with the supply cord connected to a power outlet
can lead to severe injury and burns.
▶ Always unplug the supply cord before carrying out care and maintenance tasks.
Care
• Carefully remove any dirt that may be adhering to parts.
• Clean the air vents carefully with a dry brush.
• Use only a slightly damp cloth to clean the casing. Do not use cleaning agents containing silicone as
these may attack the plastic parts.
Maintenance
WARNING
Danger of electric shock! Improper repairs to electrical components may lead to serious injuries including
burns.
▶ Repairs to the electrical section of the tool or appliance may be carried out only by trained electrical
specialists.
• Check all visible parts and controls for signs of damage at regular intervals and make sure that they all
function correctly.
• Do not operate the product if signs of damage are found or if parts malfunction. Have it repaired
immediately by Hilti Service.
• After cleaning and maintenance, fit all guards or protective devices and check that they function correctly.
To help ensure safe and reliable operation, use only genuine Hilti spare parts and consumables. Spare
parts, consumables and accessories approved by Hilti for use with the product can be found at your
local Hilti Store or online at: www.hilti.group.
7.2

Replacing the carbon brushes

WARNING
Risk of injury due to electric shock !
▶ The machine may be operated, serviced and repaired only by trained, authorized personnel. This
personnel must be specially informed of any possible hazards.
18 English
Printed: 09.08.2019 | Doc-Nr: PUB / 5069547 / 000 / 06
434950
*434950*