Troubleshooting - Hilti DD 150-U Manual

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.
1. Open the carbon brush covers on the left-hand and right-hand sides of the motor.
2. 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.
3. Fit the new carbon brushes, positioning them exactly the same as the old ones fitted previously.
Take care to avoid damaging the insulation on the indicator lead as you insert the brushes.
4. Screw on the carbon brush covers on the left- and right-hand side of the motor.
5. Run in the carbon brushes by letting the machine run under no load for at least 1 minute without
interruption.
After replacing the carbon brushes, the indicator lamp will go out after the machine has run for
approx. one minute.
7.3 Transport and storage
ATTENTION
Hazard due to low temperatures! Water finding its way into this product can result in damage and increases
the risk of electric shock.
▶ When temperatures drop below zero, check that no water remains in the machine.
▶ Open the water flow regulator before stowing away the diamond core drilling machine.
8

Troubleshooting

If the trouble you are experiencing is not listed in this table or you are unable to remedy the problem by
yourself, please contact Hilti Service.
42 English
Printed: 09.08.2019 | Doc-Nr: PUB / 5069546 / 000 / 09
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