Bosch GBH 5-38 X Professional Original Operating Instructions page 7

OBJ_BUCH-436-005.book Page 7 Tuesday, September 6, 2016 12:54 PM
Assembly
 Before any work on the machine itself, pull the mains
plug.
Auxiliary Handle
 Operate your machine only with the auxiliary handle 5.
The auxiliary handle 5 can be set to any position for a secure
and low-fatigue working posture.
– Turn the bottom part of the auxiliary handle 5 in counter-
clockwise direction and swivel the auxiliary handle 5 to the
desired position. Then retighten the bottom part of the
auxiliary handle 5 by turning in clockwise direction.
Changing the Tool
The SDS-max/Hex drill chuck allows for simple and conveni-
ent changing of drilling tools without the use of additional
tools.
The dust protection cap 1 largely prevents the entry of drilling
dust into the tool holder during operation. When inserting the
tool, take care that the dust protection cap 1 is not damaged.
 A damaged dust protection cap should be changed im-
mediately. We recommend having this carried out by
an after-sales service.
Inserting (see figure A)
– Clean and lightly grease the shank end of the tool.
– Push back the locking sleeve 2 and insert the tool in a twist-
ing manner into the tool holder. Release the locking sleeve
2 again in order to lock the tool.
– Check the latching by pulling the tool.
Removing (see figure B)
– Push back the locking sleeve 2 and remove the tool.
Dust/Chip Extraction
Dusts from materials such as lead-containing coatings, some
wood types, minerals and metal can be harmful to one's
health. Touching or breathing-in the dusts can cause allergic
reactions and/or lead to respiratory infections of the user or
bystanders.
Certain dusts, such as oak or beech dust, are considered as
carcinogenic, especially in connection with wood-treatment
additives (chromate, wood preservative). Materials contain-
ing asbestos may only be worked by specialists.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the mate-
rials to be worked.
Operation
Starting Operation
 Observe correct mains voltage! The voltage of the pow-
er source must agree with the voltage specified on the
nameplate of the machine. Power tools marked with
230 V can also be operated with 220 V.
Bosch Power Tools
Setting the operating mode
The operating mode of the power tool is selected with the
mode selector switch 3.
Note: Change the operating mode only when the machine is
switched off! Otherwise, the machine can be damaged.
– Turn the mode selector switch 3 to the requested position.
Position for hammer drilling in concrete or
stone
When the drilling tool does not immediately
rotate upon switching on, allow the machine
to run slowly until the drilling tool rotates.
Vario-Lock position for adjustment of the
chiselling position
Position for chiselling
Switching On and Off
– To start the machine, press the On/Off switch 4 and keep
it pressed.
– To switch off the machine, release the On/Off switch 4.
For low temperatures, the machine reaches the full ham-
mer/impact capacity only after a certain time.
This start-up time can be shortened by striking the inserted
tool insert against the floor one time.
Safety Clutch
 If the tool insert becomes caught or jammed, the drive
to the drill spindle is interrupted. Because of the forces
that occur, always hold the power tool firmly with both
hands and provide for a secure stance.
 If the power tool jams, switch the machine off and loosen
the tool insert. When switching the machine on with the
drilling tool jammed, high reaction torques can occur.
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" posi-
tion (see "Setting the operating mode", page 7).
– Turn the tool holder to the desired chiselling position.
– Turn the mode selector switch 3 to the "chiselling" posi-
tion. The tool holder is now locked.
 The mode selector switch 3 must always be locked in
the "Chiselling" position when chiselling.
English | 7
1 609 92A 1VX | (6.9.16)