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-CAUTION-

■

Grinding may produce hazardous
dust.

■

The dust produced by grinding
may be damaging to the lungs
and eyes.

■

Use a dust extraction system,
wear a safety helmet, breathing
protection and eye protection.

6.3.1 Fitting the diamond cup wheel

1. Place the clamping flange on the spindle, with the

O-shaped recess underneath, ensuring that it engages
securely.

씊

2. Place the cup wheel on the centering collar of the clamp-

ing flange.

씊

3. Screw on the clamping nut in a clockwise direction

and tighten it by hand or with the wrench against the
resistance of the motor / gearing.

6.3.2 Removing the diamond cup wheel

1. Press in the spindle lockbutton and hold it in this posi-

tion.

2. Release the clamping nut by turning it with the wrench

in a counter-clockwise direction.

3. Release the spindle lockbutton.
4. Remove the diamond cup wheel.

6.3.3 Changing the speed setting

The tool provides two different speed settings.

Recommendation

Setting I: 4700 /min
Use this setting for grinding soft mineral materials such
as paint coatings on cement rendering. At this speed set-
ting, dust extraction performance is improved and the
tool can be guided more easily for removing coatings
from soft materials.
Setting II: 6600 /min
Use this setting for grinding hard mineral materials such
as concrete, screed or rock in order to obtain full grind-
ing performance.

7. Operation

It is essential that the safety precautions printed in these
operating instructions are read and observed.

7.1 Switching the tool on

1. Connect the hose between the tool and the industrial

vacuum cleaner.

2. Connect the electric cable between the DG 150 and the

DPC 20.

3. Connect the DPC 20 to the mains supply.
4. Lift the tool away from the work surface.
5. Push the on / off switch forward to the ON (I) position.

The switch engages in the ON (I) position.

After a power cut, the tool can be restarted by moving
the on / off switch to the OFF (0) position and then to the
ON (I) position.

7.2 Testing new diamond cup wheels

Allow the tool to run for at least 30 seconds under no
load. The diamond cup wheel should not be used if it
vibrates. Do not subject diamond cup wheels to impacts
and keep them free from grease.

7.3 Grinding

●

Caution. During testing, operation and until the cup

wheel has come to a stop, the DG 150 should always be
operated in contact with or close to the material.

●

Never operate the tool without its protective equipment.

●

Use only Hilti DG-CW 150/6

″

diamond cup wheels.

●

Apply moderate pressure, appropriate to the materi-

al being ground. Move the tool from side to side and do
not press the diamond cup wheel into the material.

●

The diamond cup wheel may overheat and suffer dam-

age when grinding particularly hard mineral materials,
e.g. concrete containing a high proportion of hard aggre-
gates. Should this occur, the grinding operation must be
interrupted and the diamond cup wheel allowed to cool
for a short time with the tool running under no load.

●

Slower progress may indicate that the diamond cup

wheel has lost cutting power (segments have become
polished). The segments can be resharpened by grind-
ing an abrasive material (Hilti sharpening plate or abra-
sive sand-lime block).

7.4 Switching the tool off

1. Press the on / off switch. When released, the switch

returns to the OFF position.

2. Disconnect the supply cord from the socket.
3. If an industrial vacuum cleaner is used, disconnect the

hose between the tool and the vacuum cleaner.

-CAUTION-

■

The tool and the grinding oper-
ation emit noise.

■

Excessive noise may damage
the hearing.

■

Wear ear protection.