Hilti DCH 300 Mode D'emploi Original page 27

▶ Use extra caution when making a "pocket cut" into existing walls or other blind areas. The
protruding wheel may cut gas or water pipes, electrical wiring or objects that can cause kickback.
2.3 Additional safety instructions
Personal safety
▶ When working, always guide the supply cord and the extension cable to the rear and away from the
power tool. This reduces the risk of tripping over cables while work is in progress.
▶ If work involves break-through, always secure the area on the side opposite where the work is carried
out. Pieces of debris could drop out and/or fall down and injure other persons.
▶ Use the product only when it is in perfect working order.
▶ Never tamper with or modify the power tool in any way.
▶ Wear protective gloves, especially when changing discs, when adjusting the guard and when installing
the depth gauge.
▶ Use a dust removal system and suitable mobile dust extractor whenever possible. Dust from materials
such as lead-based paint, certain types of wood and concrete/masonry/stone containing quartz, minerals
or metal can be harmful to health.
▶ Before starting work, check the hazard class of the dust that will be produced when working. Use
an industrial vacuum cleaner with an officially approved protection class in compliance with the locally
applicable dust protection regulations.
▶ Make sure that the workplace is well ventilated and, if necessary, wear a respirator appropriate for
the type of dust generated. Contact with or inhalation of the dust can cause allergic reactions and/or
respiratory or other diseases among operators or bystanders. Certain kinds of dust such as oakwood
and beechwood dust are classified as carcinogenic, especially in conjunction with additives for wood
conditioning (chromate, wood preservative). Only specialists are permitted to handle material containing
asbestos.
▶ Wear light respiratory protection when using the power tool for dry cutting without a vacuum dust removal
system. Close the cap over the dust removal hose connector.
▶ Do not touch rotating parts – risk of injury! Switch the power tool on only after it is in position at the
workpiece.
▶ Take breaks between working and do relaxation and finger exercises to improve the blood circulation in
your fingers. Exposure to vibration during long periods of work can lead to disorders of the blood vessels
and nervous system in the fingers, hands and wrists.
Electrical safety
▶ Before beginning work, check the working area (e.g. using a metal detector) to ensure that no concealed
electric cables or gas and water pipes are present. External metal parts on the power tool can become
live, for example if you inadvertently damage electric wiring.
▶ Do not touch the supply cord or extension cord if it is damaged while working. Unplug the supply cord
from the power outlet.
▶ Check the power tool's supply cord at regular intervals and have it replaced by a qualified specialist if
found to be damaged.
▶ Check extension cords at regular intervals and replace them if found to be damaged.
Using and handling the power tool
▶ Make sure that sparks created during use do not present a hazard. Adjust the guard to the appropriate
position.
▶ Before use, make sure that the cutting disc is correctly installed and secured and run the cutting disc for
30 seconds under no load in a safe position. Switch off the power tool immediately if significant vibration
occurs or some other fault is perceived. Under these circumstances, check the entire system to ascertain
the cause.
▶ Do not use the power tool if it starts sharply or jerkily. The electronics might be defective. Have the
power tool repaired by Hilti Service.
▶ Close the cap over the dust removal hose connector for cutting metals.
Slits cut into load-bearing walls or other structures can influence the statics of the structure, especially when
reinforcing bars or load-bearing components are cut.
▶ Consult the responsible structural engineer, architect or person in charge of the building project before
starting work.
▶ Guide the power tool carefully and make straight cuts in order to keep the cutting disc from jamming. Do
not attempt to make curved cuts.
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2149874 English 21