Operational Cautions - Hitachi WH 10DL Handling Instructions Manual

7. Tightening and loosening screws
Install the bit that matches the screw, line up the bit in the grooves of the head of the screw,
then tighten it.
Push the impact driver just enough to keep the bit fi tting the head of the screw.
CAUTION
Applying the impact driver for too long tightens the screw too much and can break
it.
Tightening a screw with the impact driver at an angle to that screw can damage the
head of the screw and the proper force will not be transmitted to the screw.
Tighten with this impact driver lined up straight with the screw.
8. Battery Level Warning Lamp
The battery level can be checked by pulling the trigger switch while
the power tool is in a no-load state. The battery level warning lamp
lights when the battery power is very low. If this happens, charge
the battery. (Fig. 7)
NOTE
The level at which the battery level warning lamp lights may vary
○
due to the ambient temperature, characteristics of the battery, etc.
and is intended only as a guide.
The battery level warning lamp may light when the power tool is
○
overloaded. This does not mean that the battery power is very low.
Be sure to check the battery level while the tool is in a no-load state.

OPERATIONAL CAUTIONS

1. Resting the unit after continuous work
After use for continuous bolt-tightening work, rest the unit for 15 minutes or so when
replacing the battery. The temperature of the motor, switch, etc., will rise if the work is
started again immediately after battery replacement, eventually resulting in burnout.
NOTE
Do not touch the metal parts, as it gets very hot during continuous work.
2. Cautions on use of the speed control switch
This switch has a built-in, electronic circuit which steplessly varies the rotation speed.
Consequently, when the switch trigger is pulled only slightly (low speed rotation) and the
motor is stopped while continuously driving in screws, the components of the electronic
circuit parts may overheat and be damaged.
3. Use a tightening time suitable for the screw
The appropriate torque for a screw diff ers according to the material and size of the screw,
and the material being screwed etc., so please use a tightening time suitable for the screw.
In particular, if a long tightening time is used in the case of screws smaller than M8, there
is a danger of the screw breaking, so please confi rm the tightening time and the tightening
torque beforehand.
27
English
Battery level
warning lamp
Fig. 7