Changing The Tool; Starting Operation - Bosch DBH 740 R Notice Originale

OBJ_BUCH-2092-002.book Page 16 Thursday, February 23, 2017 11:46 AM
16 | English
Avoid restrictions in the air supply, e.g., from pinching, kink-
ing, or stretching!
When in doubt, check the pressure at the air inlet with a pres-
sure gauge with the pneumatic tool switched on.
Connecting the Air Supply to the Pneumatic Tool
– Screw hose fitting 9 into the connection socket at air inlet
7.
To avoid damage to interior valve components of the pneu-
matic tool when screwing hose fitting 9 in or out, it is rec-
ommended to counter-hold the projecting connection
socket of air intake 7 with an open-end wrench (size
22 mm).
– Loosen hose clamp 12 of supply-air hose 13, mount the
supply-air hose to hose fitting 9 and retighten the hose
clamp.
Note: Always mount the supply-air hose to the pneumatic tool
first, then to the maintenance unit.
Selecting Drill Chucks and Tools
For hammer drilling and chiselling (chiselling only with
MV 200 accessory), SDS-plus tools are required that are in-
serted in the SDS-plus drill chuck.
For drilling without impact in wood, metal, ceramic and plas-
tic as well as for screwdriving, tools without SDS-plus are
used (e.g., drills with cylindrical shank). For these tools, a
keyless chuck or a key type drill chuck are required.
Changing the Key Type Drill Chuck
To work with tools without SDS-plus (e.g., drills with cylindri-
cal shank), a suitable drill chuck must be mounted (key type
drill chuck or keyless chuck, accessories).
Mounting the Key Type Drill Chuck (see figure C)
– Screw the SDS-plus adapter shank 16 into a key type drill
chuck 15. Secure the key type drill chuck 15 with the se-
curing screw 14. Please observe that the securing
screw has a left-hand thread.
Inserting the Key Type Drill Chuck (see figure D)
– Clean the shank end of the adapter shank and apply a light
coat of grease.
– Insert the key type drill chuck with the adapter shank into
the tool holder with a turning motion until it automatically
locks.
– Check the locking effect by pulling the key type drill chuck.
Removing the Key Type Drill Chuck
– Push the locking sleeve 3 toward the rear and pull out the
key type drill chuck 15.

Changing the Tool

The dust protection cap 2 largely prevents the entry of drilling
dust into the tool holder during operation. When inserting the
tool, take care that the dust protection cap 2 is not damaged.
 A damaged dust protection cap should be changed im-
mediately. We recommend having this carried out by
an after-sales service.
1 609 92A 33X | (23.2.17)
Inserting SDS-plus Drilling Tools (see figure E)
The SDS-plus drill chuck allows for simple and convenient
changing of drilling tools without the use of additional tools.
– Clean and lightly grease the shank end of the tool.
– Insert the tool in a twisting manner into the tool holder until
it latches itself.
– Check the latching by pulling the tool.
As a requirement of the system, the SDS-plus drilling tool can
move freely. This causes a certain radial run-out at no-load,
which has no effect on the accuracy of the drill hole, as the
drill bit centres itself upon drilling.
Removing SDS-plus Drilling Tools (see figure F)
– Push back the locking sleeve 3 and remove the tool.
Inserting Drilling Tools without SDS-plus
Note: Do not use tools without SDS-plus for hammer drilling
or chiselling! Tools without SDS-plus and their drill chucks are
damaged by hammer drilling or chiselling.
– Insert a key type drill chuck 15 (see "Changing the Key
Type Drill Chuck", page 16).
– Open the key type drill chuck 15 by turning until the tool
can be inserted. Insert the tool.
– Insert the chuck key into the corresponding holes of the
key type drill chuck 15 and clamp the tool uniformly.
Removing Drilling Tools without SDS-plus
– Turn the sleeve of the key type drill chuck 15 with the drill
chuck key in anticlockwise direction until the drilling tool
can be removed.
Operation

Starting Operation

The pneumatic tool works optimally at a working pressure of
5 bar (72.5 psi), measured at the air inlet when the pneumat-
ic tool is switched on.
Setting the operating mode
The operating mode of the pneumatic tool is selected using
the mode selector switch 5.
Note: Change the operating mode only when the pneumatic
tool is switched off! Otherwise, the pneumatic tool may be-
come damaged.
– Turn the mode selector switch 5 to the requested position.
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Position for drilling without im-
pact in wood, metal, ceramic and
plastic as well as for screwdriving
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Position for chiselling
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Bosch Power Tools