Starting Operation - Bosch PSB 850-2 RE Originalbetriebsanleitung

OBJ_BUCH-875-005.book Page 19 Monday, August 1, 2016 12:53 PM
Adjusting the Drilling Depth (see figure G)
The required drilling depth X can be set with the depth stop 1.
Press the button for the depth stop adjustment 3 and insert
the depth stop into the auxiliary handle 12.
The knurled surface of the depth stop 1 must face downward.
Pull out the depth stop until the distance between the tip of
the drill bit and the tip of the depth stop corresponds with the
desired drilling depth X.
Changing the Tool (see figure H)
Keyless Chuck
The drill spindle is locked when the On/Off switch 10 is not
pressed. This makes quick, convenient and easy changing of
the tool in the drill chuck possible.
Open the keyless chuck 2 by turning in rotation direction ,
until the tool can be inserted. Insert the tool.
Firmly tighten the collar of the keyless chuck 2 by hand in ro-
tation direction  until the locking action ("click") is no longer
heard. This automatically locks the chuck.
The locking is released again to remove the tool when the col-
lar is turned in the opposite direction.
Screwdriver Tools
When working with screwdriver bits 26, a universal bit holder
25 should always be used. Use only screwdriver bits that fit
the screw head.
For driving screws, always position the "Drilling/Impact Drill-
ing" selector switch 4 to the "Drilling" symbol.
Replacing the Drill Chuck
 Before any work on the machine itself, pull the mains
plug.
Removing the Drill Chuck (see figure I)
Disassemble the auxiliary handle and set the gear selector 11
to the centre position between the 1st and 2nd gear.
Insert a steel pin with a diameter of Ø 4 mm and approx.
50 mm of length into the drill hole on the spindle neck in order
to lock the drill spindle.
Clamp the short end of a hex key 27 into the keyless chuck 2.
Place the machine on a stable surface (e. g. a workbench).
Hold the machine firmly and loosen the keyless chuck 2 by
turning the hex key 27 in rotation direction . Loosen a tight-
seated keyless chuck by giving the long end of the hex key 27
a light blow. Remove the hex key from the keyless chuck and
completely unscrew the keyless chuck.
Mounting the Drill Chuck (see figure J)
The keyless chuck is mounted in reverse order.
 Remove the steel pin from the drill hole on the spindle
neck after mounting is completed.
The drill chuck must be tightened with a tightening
torque of approx. 50–55 Nm.
Bosch Power Tools
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.
Reversing the rotational direction (see figure K)
The rotational direction switch 9 is used to reverse the rota-
tional direction of the machine. However, this is not possible
with the On/Off switch 10 actuated.
Right rotation: Press the rotational direction switch 9
through to the right stop (for drilling and driving screws).
The indicator for right-hand rotation 6 indicates the selected
rotational direction.
Left rotation: Press the rotational direction switch 9 through
to the left stop (for loosening and unscrewing screws and
nuts).
The indicator for left-hand rotation 7 indicates the selected
rotational direction.
Setting the operating mode
Drilling and Screwdriving
Set the selector switch 4 to the "Drilling" symbol.
Impact Drilling
Set the selector switch 4 to the "Impact drilling"
symbol.
The selector switch 4 engages noticeably and can also be ac-
tuated with the machine running.
Gear selection, mechanical
 The gear selector 11 can be actuated on machines run-
ning at low speed. However, this should not be done
when the machine is stopped, at full load or running at
maximum speed.
Two speed ranges can be preselected with the gear selector
11.
Gear I:
Low speed range; for working with large drill-
ing diameter or for driving in screws.
Gear II:
High speed range; for working with small drill-
ing diameter.
Always turn the gear selector 11 in the direction of the arrow.
If the gear selector 11 cannot be fully engaged, lightly rotate
the drive spindle with the drill bit by twisting the drill chuck.
Switching On and Off
To start the machine, press the On/Off switch 10 and keep it
pressed.
To lock the pressed On/Off switch 10, press the lock-on but-
ton 8.
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1 609 92A 1NX | (1.8.16)