Bosch GBH 7-46 DE Service Manual download pdf (Page 19)

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Bosch Power Tools 1 609 929 V45 | (6.7.10)

Setting the Speed/Impact Rate

The electronic control enables stepless speed

and impact preselection in accordance with the

material to be worked.

The constant electronic control keeps the prese-

lected speed and impact rate nearly constant

between no-load and load conditions.

The maximum hammering capacity is achieved

when the thumbwheel 5 is set to position “6”.

For lower speed settings, the hammering capac-

ity is lower due to technical reasons.

– Select the speed with the thumbwheel 5 ac-

cording to the material.

The data in the following table are recommend-

ed values.

Safety Clutch

f If the tool insert becomes caught or

jammed, the drive to the drill spindle is in-

terrupted. Because of the forces that occur,

always hold the power tool firmly with both

hands and provide for a secure stance.

f If the power tool jams, switch the machine

off and loosen the tool insert. When switch-

ing the machine on with the drilling tool

jammed, high reaction torques can occur.

Working Advice

f Before any work on the machine itself, pull

the mains plug.

Changing the Chiselling Position (Vario-Lock)

The chisel can be locked in 12 positions. In this

manner, the optimum working position can be

set for each application.

– Insert the chisel into the tool holder.

– Turn the mode selector switch 3 to the

“Vario-Lock” position (see “Setting the Oper-

ating Mode”, page 18).

– Turn the tool holder to the desired chiselling

position.

– Turn the mode selector switch 3 to the “chis-

elling” position. The tool holder is now

locked.

f The mode selector switch 3 must always be

locked in the “Chiselling” position when

chiselling.

Maintenance and Service

Maintenance and Cleaning

f Before any work on the machine itself, pull

the mains plug.

f For safe and proper working, always keep

the machine and ventilation slots clean.

f A damaged dust protection cap should be

changed immediately. We recommend hav-

ing this carried out by an after-sales serv-

ice.

If the machine should fail despite the care taken

in manufacturing and testing procedures, repair

should be carried out by an after-sales service

centre for Bosch power tools.

In all correspondence and spare parts order,

please always include the 10-digit article

number given on the type plate of the machine.

Operating

Mode

Hammer Drilling Chiselling

Thumb-

wheel 5

Rated

Speed

(rpm)

Impact

Rate

(min

-1

)

Impact

Rate

(min

-1

)

1 145 1350 1375

2 170 1625 1650

3 200 1975 2025

4 225 2175 2225

5 255 2475 2550

6 280 2700 2800

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