Bosch GBH 3-28 E Operating Instructions Manual page 9

OBJ_BUCH-391-001.book Page 9 Thursday, May 3, 2007 9:19 AM
Selecting the Tool Holder
For hammer drilling, SDS-plus drilling tools that can be
inserted into the SDS-plus tool holder 1 are required.
For drilling without impact in wood, metal, ceramic and
plastic, use non-SDS-plus drilling tools (e. g. drill bits
with cylindrical shank). A keyless or a key type drill
chuck is required for such drilling tools.
Note: Do not use drilling tools without SDS-plus for
hammer drilling! Drilling tools without SDS-plus as well
as the tool holder are damaged when used for hammer
drilling.
GBH 3-28 FE: The SDS-plus tool holder 1 can easily
be exchanged against the keyless replacement chuck
13 provided.
Changing the Tool Holder
Dismounting the SDS-plus Tool Holder or the
Keyless Replacement Chuck (see figure B)
Pull the lock ring of the tool holder 4 firmly in the direc-
tion of the arrow, hold it in this position and pull off the
tool holder 1 or the keyless replacement chuck 13
toward the front.
After removing, protect the tool holder 1 or the keyless
replacement chuck 13 against contamination. Lightly
lubricate the engaging grooves, if required.
Mounting the SDS-plus Tool Holder or the
Keyless Replacement Chuck
Grasp the tool holder 1 or the keyless replacement
chuck 13 completely with your hand. Slide the tool
holder 1 or the keyless replacement chuck 13 with a
turning motion onto the drill chuck mounting until a dis-
tinct latching noice is heard.
The tool holder 1 or the keyless replacement chuck 13
is automatically locked. Check the locking effect by
pulling the tool holder.
Changing the Key Type Drill Chuck
(GBH 3-28 E) (see figure C)
Mounting the Key Type Drill Chuck
Screw the SDS-plus adapter shank 12 into a key type
drill chuck 11. Secure the key type drill chuck 11 with
the securing screw 10. Please observe that the
securing screw has a left-hand thread.
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 auto-
matically locks.
Check the locking effect by pulling the key type drill
chuck.
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Dismounting the Key Type Drill Chuck
Push the locking sleeve 3 toward the rear and pull out
the key type drill chuck 11.
Changing the Tool
With the SDS-plus tool holder, simple and convenient
tool changing is possible without additional aids.
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 centers itself upon drilling.
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 immediately. We recommend having
this carried out by an after-sales service.
Inserting SDS-plus Drilling Tools (see figure D)
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.
Removing SDS-plus Drilling Tools (see figure E)
Push back the locking sleeve 3 and remove the tool.
Inserting Drilling Tools without SDS-plus
(GBH 3-28 FE) (see figure F)
Note: Do not use drilling tools without SDS-plus for
hammer drilling! Drilling tools without SDS-plus as well
as the tool holder are damaged when used for hammer
drilling.
Insert the quick change keyless chuck 13.
Firmly hold the retaining ring of the keyless replacement
chuck 13. Open the keyless replacement chuck by
turning the front sleeve in the direction of the symbol
" ".
Insert the drilling tool into the keyless replacement
chuck 13. Firmly hold the retaining ring of the keyless
replacement chuck 13 and turn the front sleeve in the
direction of the symbol "
Set the selector switch 6 to the "Drilling" symbol.
Removing Drilling Tools without SDS-plus
(GBH 3-28 FE) (see figure F)
Firmly hold the retaining ring of the keyless replacement
chuck 13. Open the keyless replacement chuck by
turning the front sleeve in the direction of the symbol
" ".
Remove the drilling tool.
".
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