Bosch PBH 2900 FRE Manual Original página 28

OBJ_BUCH-318-002.book Page 28 Thursday, September 3, 2009 10:01 AM
28 | English
Switching On and Off
– To start the machine, press the On/Off
switch 8.
– To lock the On/Off switch 8, keep it pressed
and additionally push the lock-on button 7.
– To switch off the machine, release the
On/Off switch 8. When the On/Off switch 8
is locked, press it first and then release it.
Setting the Speed/Impact Rate
The speed/impact rate of the switched on pow-
er tool can be variably adjusted, depending on
how far the On/Off switch 8 is pressed.
Light pressure on the On/Off switch 8 results in
low speed/impact rate. Further pressure on the
switch increases the speed/impact rate.
Preselecting the Speed/Impact Frequency
The required speed can be preselected with the
thumbwheel 9 (also while running).
Due to the limitation, the On/Off switch 8 can
only be pulled through to the preset limit.
Gear Selection, Mechanical (PBH 3000-2 FRE)
Two speed ranges can be preselected with the
gear selector 13.
1st gear:
Low speed range; for hammer drilling, chisel-
ling, drilling with large drilling diameter, screw-
driving and thread cutting.
2nd gear:
High speed range; for drilling with small drilling
diameter.
– To change gear, push the release button 11
on the mode selector switch 12 and turn the
mode selector switch to the "drilling" posi-
tion. Then push the release button 14 on the
gear selector 13 and turn the gear selector to
2nd gear.
Note: The mode selector switch 12 may only be
turned when the machine is switched off. The
machine should also be switched off when turn-
ing the gear selector 13.
1 609 929 T39 | (3.9.09)
Hammer drilling and chiselling is possible only
in 1st gear. In these operating modes, the spe-
cial shape of the gear selector 13 and mode se-
lector switch 12 do not allow switching to
2nd gear.
Before changing the operating mode from drill-
ing to hammer drilling, Vario-Lock or chiselling,
the gear selector 13 must be set back to
1st gear.
Safety Clutch
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.
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
Rotation Direction for Chiselling
For chiselling, always set the rotation direction
to right rotation. This prevents increased wear
of the carbon brushes.
Changing the Chiselling Position (Vario-Lock)
The chisel can be locked in 36 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 12 to the
"Vario-Lock" position (see "Setting the Oper-
ating Mode", page 27).
– Turn the tool holder to the desired chiselling
position.
– Turn the mode selector switch 12 to the
"chiselling" position. The tool holder is now
locked.
– For chiselling, set the rotation direction to
right rotation.
Bosch Power Tools