How To Use; Maintenance And Inspection - Hitachi Koki DV 20VB2 Handling Instructions Manual

6. Check the rotational direction (Fig. 5)
The bit rotates clockwise (viewed from the rear side)
by pushing the R-side of the push button.
The L-side of the push button is pushed to turn the bit
counterclockwise.
(The L and R marks are provided on the body.)
CAUTION
Always use the impact drill with clockwise rotation,
when using it as an impact drill.
7. Fixing the side handle (Fig. 6)
Attach the side handle to the mounting part.
Rotate the side handle grip in a clockwise direction to
secure it.
Set the side handle to a position that is suited to the
operation and then securely tighten the side handle
grip.
To attach a depth gauge on the side handle, insert
the gauge into the U-shaped groove on the side
handle, adjust the position of the depth gauge in
accordance with the desired depth of the hole, and
firmly tighten the side handle grip. (Fig. 7)
8. IMPACT to ROTATION changeover (Fig. 8)
Shift the change lever between the right and left
positions to switch easily between IMPACT (rotation
and impact) and ROTATION (rotation only), respectively.
To bore holes in hard materials such as concrete,
stone and tiles, shift the change lever to the right-
hand position (as indicated by the
bit operates by the combined actions of impact and
rotation.
To bore holes in metal, wood and plastic, shift the
change lever to the left-hand position (as indicated by
the mark). The drill bit operates by rotational action
only, as in the case of a conventional electric drill.
CAUTION
Do not use the Impact Drill in the IMPACT function
if the material can be bored by rotation only.
Such action will not only reduce drilling efficiency,
but may also damage the drill tip.
Operating the equipment with the change lever in
mid-position may result in damage. When
switching, make sure that you shift the change
lever to the correct position.
9. High-speed/Low-speed changeover
Prior to changing speed, ensure that the switch is in
the OFF position, and the drill has come to a complete
stop.
To change speed, rotate the gear shift dial as indicated
by the arrow in Fig. 9. The numeral "1" engraved on
the drill body denotes low speed, the numeral "2"
denotes high speed.
If it is hard to turn the gear shift dial, turn the chuck
slightly in either direction and then turn the gear shift
dial again.

HOW TO USE

1. Switch operation
When the trigger is depressed, the tool rotates. When
the trigger is released, the tool stops.
The rotational speed of the drill can be controlled by
varying the amount that the trigger switch is pulled.
Speed is low when the trigger switch is pulled slightly
and increases as the trigger switch is pulled more.
The desired rotation speed can be pre-selected with
the speed control dial.
Turn the speed control dial clockwise for higher speed
and counterclockwise for lower speed. (Fig. 10)
Pulling the trigger and pushing the stopper, it keeps
the switched-on condition which is convenient for
continuous running. When switching off, the stopper
can be disconnected by pulling the trigger again.
CAUTION
If the L-side of push button is pressed for reverse bit
rotation, the stopper cannot be used.
2. Drilling
When drilling, start the drill slowly, and gradually
increasing speed as you drill.
Always apply pressure in a straight line with the bit.
Use enough pressure to keep drilling, but do not
push hard enough to stall the motor or deflect the bit.
To minimize stalling or breaking through the material,
reduce pressure on drill and ease the bit through the
last part of the hole.
If the drill stalls, release the trigger immediately,
remove the bit from the work and start again. Do not
click the trigger on and off in an attempt to start a
stalled drill. This can damage the drill.
The larger the drill bit diameter, the larger the reactive
force on your arm.
Be careful not to lose control of the drill because of
this reactive force.
To maintain firm control, establish a good foothold,
mark). The drill use side handle, hold the drill tightly with both hands,
and ensure that the drill is vertical to the material
being drilled.

MAINTENANCE AND INSPECTION

1. Inspecting the drill bits
Since use of an abraded drill bits will cause motor
malfunctioning and degraded efficiency, replace the
drill bits with a new one or resharpening without
delay when abrasion is noted.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure
that they are properly tightened. Should any of the
screws be loose, retighten them immediately. Failure
to do so could result in serious hazard.
3. Maintenance of the motor
The motor unit winding is the very "heart" of the power
tool. Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
4. Inspecting the carbon brushes
For your continued safety and electrical shock
protection, carbon brush inspection and replacement
on this tool should ONLY be performed by a Hitachi
Authorized Service Center.
5. Service parts list
CAUTION
Repair, modification and inspection of Hitachi Power
Tools must be carried out by a Hitachi Authorized
Service Center.
This Parts List will be helpful it presented with the
tool to the Hitachi Authorized Service Center when
requesting repair or other maintenance.
In the operation and maintenance of power tools, the
safety regulations and standards prescribed in each
country must be observed.
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