Care And Maintenance; Replacing The Carbon Brushes - Hilti DD 30-W Manual

3. The remaining drilling water (alkaline, pH value > 7) must be neutralized by the addition of an acidic
neutralizing agent or diluted with a large volume of water before it is allowed to flow into the sewerage
system.

7 Care and maintenance

WARNING
Danger of electric shock! Carrying out care and maintenance while the supply cord is connected to
the power outlet presents a risk of serious injuries including burns.
▶ Always unplug the supply cord before carrying out all care and maintenance tasks.
Care
• Carefully remove any dirt that may be adhering to surfaces.
• Clean the cooling air slots 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.
Care of accessory tools (e.g. core bits) and metal parts
▶ Remove any dirt that may be adhering to the item.
▶ Protect the surfaces of accessory tools and the chuck from corrosion by rubbing these items with an oily
cloth from time to time.
▶ Always keep the connection end clean and lightly oiled.
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 machine if damaged or if its parts malfunction. Have the machine repaired by Hilti
Service immediately.
• On versions with a replaceable supply cord, the supply cord may be replaced by a trained electrical
specialist.
• After cleaning and maintenance, fit all guards or protective devices and check that they function correctly.
Note
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 Center or online at: www.hilti.group

7.1 Replacing the carbon brushes

DANGER
Risk of injury! Risk of 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.
Note
The carbon brushes must be replaced when the indicator lamp with the wrench symbol lights.
1. Unplug the supply cord from the power outlet.
2. Open the carbon brush covers on the left-hand and right-hand sides of the motor.
3. Take note of how the carbon brushes are fitted and how the conductors are positioned. Remove
the worn carbon brushes from the diamond core drilling machine.
26 English
Printed: 06.07.2017 | Doc-Nr: PUB / 5283534 / 000 / 05