Working Advice - Bosch PBH 2800 RE Betriebsanleitung

20 | English
PBH 3000-2 FRE
For the operating modes hammer drilling, Vario-Lock and
chiselling, the gear selector 13 must be set to 1st gear.
Reversing the rotational direction (see figure M)
The rotational direction switch 10 is used to reverse the rota-
tional direction of the machine. However, this is not possible
with the On/Off switch 8 actuated.
Right rotation: Push the rotational direction switch 10
rightward to the stop.
Left rotation: Push the rotational direction switch 10
leftward to the stop.
Set the direction of rotation for hammer drilling, drilling and
chiselling always to right rotation.
Switching On and Off
– To start the machine, press the On/Off switch 8.
– To lock the On/Off switch, 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.
To save energy, only switch the power tool on when using it.
Setting the Speed/Impact Rate
The speed/impact rate of the switched on power 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/im-
pact 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.
1 609 92A 0PJ | (15.4.14)
Position for drilling without im-
pact (1st gear) in wood, metal,
ceramic and plastic as well as for
screwdriving and thread cutting
Position for drilling without im-
pact (2nd gear) in wood, metal,
ceramic and plastic
Position for hammer drilling in
concrete or stone
Vario-Lock position for adjust-
ment of the chiselling position
The mode selector switch 12
does not latch in this position.
Position for chiselling
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, chiselling, drilling with
large drilling diameter, screwdriving 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" position. 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 turning the gear selector 13.
Hammer drilling and chiselling is possible only in 1st gear. In
these operating modes, the special shape of the gear selector
13 and mode selector switch 12 do not allow switching to
2nd gear.
Before changing the operating mode from drilling 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 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.

Working Advice

Rotation Direction for Chiselling
For chiselling, always set the rotation direction to right rota-
tion. 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" posi-
tion (see "Setting the operating mode", page 19).
– Turn the tool holder to the desired chiselling position.
– Turn the mode selector switch 12 to the "chiselling" posi-
tion. The tool holder is now locked.
– For chiselling, set the rotation direction to right rotation.
Inserting Screwdriver Bits (see figure N)
 Apply the power tool to the screw/nut only when it is
switched off. Rotating tool inserts can slip off.
To work with screwdriver bits, a universal bit holder 33 with
SDS-plus shank (accessory) is required.
– Clean the shank end of the adapter shank and apply a light
coat of grease.
– Insert the universal bit holder with a turning motion into
the tool holder until it automatically locks.
Bosch Power Tools