Bosch GDB 350 WE Professional - Инструкция по эксплуатации - Страница 13

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13

Bosch Power Tools

1 609 92A 1A4 | (12.5.15)

If the red control indicator does not extinguish when you 
press the 

“TEST”

 button or if it extinguishes repeatedly when 

the power tool is switched on, then you must have the power 
tool checked by an authorised Bosch after-sales service 
agent.



If the portable residual current device (PRCD) is defec-

tive, the power tool must not be operated. 

Switching On

Press the 

“RESET”

 button on the portable residual current 

device (PRCD) 

2

.

Set the water cock 

8

 to flow.

To 

switch on

 the machine, flip the On/Off switch 

3

 to 

position

I

.

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

Switching Off

To 

switch off

 the machine, flip the On/Off switch 

3

 to position 

0

.

Shut the water cock 

8

. After finishing work, disconnect the 

water outlet connector 

7

 from the water supply. Open the wa-

ter cock 

8

 and drain the remaining water.

Reduced starting current

The electronics of the power tool make the motor start softly, 
therefore preventing the starting current from being too high.

Restarting Protection

The restarting protection feature prevents uncontrolled 
restarting of the machine after an interruption in the power 
supply.

To 

restart

, press the 

“RESET”

 button on the portable residu-

al current device (PRCD) 

2

. Then switch the On/Off switch 

3

to the off-position and switch the power tool on again.

Preselecting the Speed

Three speeds can be preselected using the gear selector 

6

.

The gears are recommended for the following drilling diame-
ters:

Working Advice



Before any work on the machine itself, pull the mains 

plug.

Loosen the parking brake 

5

 in order to drill. When doing so, 

hold the star handle 

4

 of the drill stand in place in order to pre-

vent the drill from sliding down in an uncontrolled manner 
(see operating instructions of the drill stand).

Start drilling in 1st gear with low speed until the core bit ro-
tates in the material without vibrating. Then switch to 2nd or 
3rd gear if necessary.

While drilling, adapt the feed pressure to the material being 
drilled. Drill with uniform pressure. Lightly pull the core bit 
out of the bore from time to time so that the drilling sludge is 
removed from the core bit segments.

Overload Clutch

If a core bit jams or snags, the drive to the drill spindle will be 
interrupted. In this case, switch the power tool off immediate-
ly to prevent wear and heat build-up.

Dislodge the core bit by turning it to the right and left using a 
suitable open-end spanner. Carefully pull the power tool out 
of the bore hole as you do so.

Overload Protection

If the overload threshold is exceeded, then the power tool will 
begin to pulsate noticeably. Reduce the feed pressure until 
the power tool works normally again.

If the feed pressure is not reduced, then the power tool will 
switch off. You can then switch the power tool back on 
straightaway, but you should continue to work with reduced 
feed pressure.

Removing the Core

After drilling, continue to run the water for a short period in or-
der to flush out the drilling sludge between the core bit and 
the core.

If the drilling core is stuck in the core bit, then apply light 
blows onto the core bit with a piece of soft wood or plastic in 
order to loosen the core. If required, pry the drilling core out 
of the core bit using an appropriate hand tool (slotted screw-
driver or similar).

Note: 

Do not hammer or apply blows onto the core bit with 

hard objects (danger of deformation)!

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.

Clean the drilling spindle 

10

 after finishing work. Occasionally 

spray an anti-corrosion agent onto the drilling spindle and the 
core bit 

9

.

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.

1st gear

165 – 350 mm

2nd gear

80 – 160 mm

3rd gear

55 – 105 mm

OBJ_BUCH-2203-002.book  Page 13  Tuesday, May 12, 2015  9:22 AM