DeWalt DCH274 User Manual

13
English
Replacing the SDS Plus
®
Tool Holder
with the Keyless Chuck (fig.7)
DCH274
1. Turn the locking collar(p) into the unlocked
position and pull the SDS Plus
®
tool
holder(l)off.
2. Push the keyless chuck(q) onto the spindle and
turn the locking collar into the lockingposition.
3. To replace the keyless chuck with the
SDS Plus
®
tool holder, first remove the keyless
chuck the same way as the SDS Plus
®
tool
holder was removed. Then replace the
SDS Plus
®
tool holder the same way as the
keyless chuck wasreplaced.
WARNING: Never use standard chucks
in the rotary hammeringmode.
Overload Clutch
There are two different types of overload clutch
fitted.The DCH273 and DCH274 have an electronic
overload clutch fitted.
In case of jamming of a drill bit, the drive to the
drill spindle is interrupted. On units fitted with a
mechanical clutch the indication that the clutch has
activated will be an audible ratcheting together with
increased vibration. If the electronic clutch activates
the motor is repeatedly switched on and off for a few
seconds to replicate the feedback associated with a
mechanical clutch. Release and depress the trigger
to re-engage drive.
Because of the resulting forces, always hold the tool
with both hands and take a firmstance.
Dust Extraction System (fig.1)
A dedicated integrated dust extraction
system (D25303DH) is available and can be
purchasedseparately.
To operate the D25303DH uses an electrical
connection(t) to the rotary hammer.
The DCH273, and DCH274 rotary hammer models
are equipped with the electrical connection(t).
OPERATION
Instructions for Use
WARNING:
•Alwaysobservethesafetyinstructions
and applicableregulations.
  •Beawareofthelocationofpipework
andwiring.
points to the drill bit symbol(i). For rotary hammering
mode, align the arrow with the hammerdrilling
symbol(j). For hammering only mode, align arrow
with the hammer symbol(k).
NOTE: The mode selector(c) must be in rotary
drilling, rotary hammering or hammering only
mode at all times. There are no operable positions
inbetween.
Active Vibration Control (fig.1)
The active vibration control neutralises rebound
vibration from the hammer mechanism. Lowering
hand and arm vibration, it allows more comfortable
use for longer periods of time and extends the life of
the unit. In operation, a spring loaded mechanism
counterbalances the vibration forces. This can be
sensed by the cushioning effect when pressure is
applied to the tool. Make sure the spring is engaged
but not too firmly. The mechanism should be
allowed to "float."
Belt Hook (Fig.1, 4)
A belt hook(r) is fitted below the main handle(h) on
the left side of the tool. To extend the belt hook pull
it out from the side of the tool. To store the belt hook
push it back flush with the side of thetool. The belt
hook(r) can be positioned to the left or right of the
tool to accommodate left or right-handed users.
1. Position the belt hook into the extended position
and remove the hex head screw located on the
underside of the main handle.
2. Pull out the belt hook until it is free from the unit.
3. Reinsert the belt hook into the desired side and
push it into the slot.
NOTE: On some models the slot may be
covered with a sticker. Either remove the
sticker or pierce the sticker to expose the slot
underneath.
4. Re-insert the hex screw and tighten securely.
If use of the hook is not desired at all, it can be
removedcompletely.
SDS Plus
®
Tool Holder (fig.5)
To insert a drill or chisel bit, insert the shank of the
bit about 19 mm (3/4") into SDS Plus
®
tool holder(l).
Push and rotate bit until it locks in place. The bit will
be securelyheld.
To release bit, pull the sleeve(m) back and remove
thebit.

DeWalt DCH274 Specifications

General

Brand	DeWalt
Model	DCH274
Category	Cutter
Language	English