Bosch GBH 5-38 D - Инструкция по эксплуатации - Страница 13

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13

Bosch Power Tools

1 609 92A 2AB | (17.6.16)

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.

Setting the operating mode

The operating mode of the power tool is selected using 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 desired position.

Switching On and Off

To save energy, only switch the power tool on when using it.

– 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.

Overload 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 loos-
en the tool insert. When switching the machine on with 
the drilling tool jammed, high reaction torques can oc-
cur.

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 position “Vario-

Lock” (see “Setting the operating mode”, page 13).

– Turn the tool holder to the desired chiselling position.
– Turn the mode selector switch 

3

 to the position “Chisel-

ling”. With this, the tool holder is locked.



For chiselling, the mode selector switch 3  must always 
be set to the position “Chiselling”.

Working Advice



Before any work on the machine itself, pull the mains 
plug.

Sharpening Chisels (see figure C)

Good results are only achieved with sharp chisels; therefore, 
sharpen the chiselling tools in good time. This ensures a long 
service life of the tools and good working performance.

–

Re-sharpening

Sharpen chiselling tools using grinding wheels (e. g. ce-
ramic bonded corundum wheel) with a steady supply of 
water. Reference values are shown in the figure. Take care 
that no annealing coloration appears on the cutting edges; 
this impairs the hardness of the chiselling tools.

– For 

forging

, heat the chisel to between 850 and 1050 ° C 

(bright red to yellow).

– For 

hardening

, heat the chisel to approx. 900 ° C and 

quench in oil. Then anneal in an oven for approx. one hour 
at 320 ° C (annealing colour = light blue).

Maintenance and Service

Maintenance and Cleaning



Before any work on the machine itself, pull the mains 
plug.



For safe and proper working, always keep the machine 
and ventilation slots clean.



A damaged dust protection cap should be changed im-
mediately. We recommend having this carried out by 
an after-sales service.

If the replacement of the supply cord is necessary, this has to 
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.

Lubrication

The power tool is oil-lubricated. An oil change is required only 
within the scope of maintenance or repair through an author-
ised after-sales service agent for Bosch power tools. In this, it 
is absolutely required to use the specified Bosch oil.

After-sales Service and Application Service

Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare 
parts. Exploded views and information on spare parts can al-
so be found under:

www.bosch-pt.com

Bosch’s application service team will gladly answer questions 
concerning our products and their accessories.

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

OBJ_BUCH-273-005.book  Page 13  Friday, June 17, 2016  11:40 AM