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21
Fig. 14
Side handle
⅜ To operate the angle unit at high speed,
attach the keyless chuck to the angle unit
spindle at the side marked “HIGH” and se-
cure the locking screw. At this setting, the
drilling speed is increased to about 150% and
the drilling torque is decreased to about 70%.
(Fig. 13)
(3) Installing the side handle and handle joint
(Fig. 14)
The side handle and handle joint can be
installed on either side of the angle unit for
right or left handed use. To install the side
handle and handle joint, thread it into the
socket on the desired side of the angle unit
and tighten it securely.
(4) Removing keyless chuck from angle unit
⅜ The keyless chuck can be removed from angle unit in the same manner it was removed
from the impact drill; however, ALWAYS REMOVE ANGLE UNIT FROM THE HAMMER
DRILL BEFORE ATTEMPTING TO LOOSEN KEYLESS CHUCK. This will prevent damage
of hammer drill’s gear. Use open end wrench provided to hold angle unit spindle before
attempting to loosen keyless chuck.
CAUTION:
If the keyless chuck cannot be removed by striking the wrench, don’t strike the wrench
forcibly and send the hammer drill to a HITACHI AUTHORIZED SERVICE CENTER.
HOW TO USE
1. Switch operation
⅜ When the switch trigger is depressed, the tool rotates. When the switch trigger is
released, the tool stops.
⅜ The rotational speed of the hammer drill can be controlled by varying the amount that
the switch trigger is pulled. Speed is low when the switch trigger is pulled slightly and
increases as the switch trigger is pulled more.
⅜ When releasing the switch trigger, the brake will be applied for immediate stopping.
2. When using as a Drill or an Hammer Drill
(1) Pressing force of the hammer drill
You cannot drill holes more quickly even if you press the hammer drill with a stronger
force than necessary. It not only damages tip of drill bit and decreases the efficiency of
operation, but also shortens the life of the drill tip.
(2) In case of penetrating holes
Drill bits can be broken when the material being drilled is penetrated. It is important to
decrease pressing force just before penetrating.