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● Regarding the temperatures and charging time of the
battery.
The temperatures and charging time will become as
shown in Table 2.
Battery
Charging voltage
Weight
Temperatures at which the
battery can be recharged
Charging time for battery
capacity, approx. (At 20oC)
1.5 Ah
2.0 Ah
2.5 Ah
3.0 Ah
4.0 Ah
5.0 Ah
Number of battery cells
NOTE
The recharging time may vary according to temperature
and power source voltage.
CAUTION
When the battery charger has been continuously used,
the battery charger will be heated, thus constituting
the cause of the failures. Once the charging has been
completed, give 15 minutes rest until the next charging.
4. Disconnect the charger's power cord from the
receptacle.
5. Hold the charger fi rmly and pull out the battery.
NOTE
Be sure to pull out the battery from the charger after use,
and then keep it.
CAUTION
○ If the battery is charged while it is heated because it has
been left for a long time in a location subject to direct
sunlight or because the battery has just been used, the
pilot lamp of the charger lights for 1 second, does not
light for 0.5 seconds (off for 0.5 seconds). In such a case,
fi rst let the battery cool, then start charging.
○ When the pilot lamp fl ickers (at 0.2-second intervals),
check for and take out any foreign objects in the charger's
battery connector. If there are no foreign objects, it is
probable that the battery or charger is malfunctioning.
Take it to your authorized Service Center.
○ Since the built-in micro computer takes about 3 seconds to
confi rm that the battery being charged with charger is taken
out, wait for a minimum of 3 seconds before reinserting it
to continue charging. If the battery is reinserted within 3
seconds, the battery may not be properly charged.
○ If the pilot lamp does not blink in red (every second)
even though the charger cord is connected to the power,
it indicates that the protection circuit of the charger may
be activated.
Remove the cord or plug from the power and then
connect it again after 30 seconds or so. If this does
not cause the pilot lamp to blink in red (every second),
please take the charger to the Hitachi Authorized Service
Center.
Table 2
Charger
UC18YFSL
V
14.4 – 18
kg
0.5
0oC – 50oC
min.
22
min.
30
min.
35
min.
45
min.
60
min.
75
4 – 10
MOUNTING AND OPERATION
Action
Removing and inserting the
battery
Charging
Remaining battery indicator
Installing / Removing the side
handle
Inserting SDS-plus drilling tools
Removing SDS-plus drilling tools
Selecting rotation direction
Selecting the operating mode
Adjusting the drilling depth
Changing the chisel position
Removing drill bit holder
(DH18DBQL, DH18DBML)*
Inserting drill chuck holder
(DH18DBQL, DH18DBML)
Inserting round shank applications
tools (DH18DBQL, DH18DBML)
Switch operation
How to use the LED light
Cleaning of the battery installation
compartment
Selecting accessories
*
If it is hard to pull out the drill chuck holder or the drill bit
holder, align the change lever with the
the lock grip.
For details on how to use the dust extraction unit, refer to
the separate instruction manual included with this tool.
(DH18DBDL/DH18DBML)
REACTIVE FORCE CONTROL
This product is equipped with a Reactive Force Control
(RFC) feature that reduces jerking of the tool body.
If the tool bit is suddenly overburdened, any jerking of the
tool body is reduced by activation of the slip clutch or by
stopping of the motor by the sensor built into the tool body.
If the motor is stopped because of overburdening detection
by the controller, this is indicated by blinking of the remaining
battery lamp while the switch is pulled. (Fig. 17)
Because the RFC feature may not activate or its performance
may be insuffi cient depending on the working environment
and conditions, be careful not to suddenly overburden the
tool bit while operating.
● Possible causes of sudden overburdening
1 Tool bit biting into material
2 Impact against nails, metal or other hard objects
3 Tasks involving prying or any excess application of
pressure, etc.
Also, other causes include any combination of the
aforementioned.
● When the reactive force control (RFC) is triggered
When the RFC is triggered and the motor stops, turn
off the tool's switch and remove the cause of the
overburdening before continuing operation.
6
Figure
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mark and turn
