Hitachi VTP-16A Mode D'emploi page 7

When boring concrete, stone, tile or similar hard
materials, turn the change ring fully clockwise. The
drill head impacts against the material while
continuing to rotate.
When boring metal, wood or plastic, turn the change
ring fully counterclockwise. The drill simply rotates
as an ordinary 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 drill efficiency, but may
also damage the drill tip.
When changing over, ensure that the change ring is
turned as far as it will go.
8. Fixing the side handle.
Loosen the glip on the side handle, and attach the
side handle to the gear cover in a position convenient
for drilling. Match the projecting part of the handle to
the groove on the gear cover, and firmly tighten the
glip.
To remove the side handle, loosen the glip, and
rotate the handle.
To attach a depth stopper on the side handle, insert
the stopper into the hexagon hole groove on the side
handle, adjust the position of the depth stopper in
accordance with the desired depth of the hole, and
firmly tighten the glip.
PRACTICAL HANDLING PROCEDURES
1. Pressure:
Drilling will NOT be accelerated by placing heavy
pressure on the drill. Such action will only result in a
damaged drill bit, decreased drilling efficiency and/
or shortened service life of the drill.
2. Using a large diameter drill bit:
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, hold the drill
tightly with both hands, and ensure that the drill is
vertical to the material being drilled.
3. When drilling completely through the material:
When the drill bit bores completely through the
material, careless handling often results in a broken
drill bit or damage to the drill body itself due to the
sudden movement of the drill.
Always be alert and ready to release the pushing
force when drilling through the material.
4. Switch operation:
(1) VTP-16A:
By pulling the trigger switch and depressing the
stopper, the switch is held in the ON position for
continuous operation. To turn the drill OFF, pull the
trigger switch again and release.
(2) VTV-16:
The rotational speed of the drill bit 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 switch is pulled more. Continuous
operation may be attained by pulling the trigger switch
and depressing the stopper. To turn the switch OFF,
pull the trigger switch again to disengage the stopper,
and release the trigger switch to its original position.
5. Precautions on boring
The drill may become overheated during operation;
however, it is sufficiently operable. Do not cool the
drill bit in water or oil.
6. Caution concerning immediately after use
Immediately after use, while it is still revolving, if the
Drill is placed on a location where considerable
ground chips and dust have accumulated, dust may
occasionally be absorbed into the Drill mechanism.
Always pay attention to this possibility.
MAINTENANCE AND INSPECTION
1. Inspection the drill bit
Continued use of a worn and/or damaged drill bit will
result in reduced drilling efficiency and may seriously
overload the drill motor. Inspect the drill bit often and
replace it with a new bit as necessary.
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. Inspecting the carbon brushes (Fig. 3)
The Motor employs carbon brushes which are
consumable parts. When they become worn to or
near the "wear limit", it could result in motor trouble.
When an auto-stop carbon brush is equipped, the
motor will stop automatically.
At that time, replace both carbon brushes with new
ones which have the same carbon brush Numbers
shown in the figure. In addition, always keep carbon
brushes clean and ensure that they slide freely within
the brush holders.
4. Replacing carbon brushes
Disassemble the brush caps with a slotted-head
screwdriver. The carbon brushes can then be easily
removed.
5. 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.
6. Service parts list
A: Item No.
B: Code No.
C: No. Used
D: Remarks
CAUTION
Repair, modification and inspection of Hitachi Power
Tools must be carried out by an Authorized Service
Center.
This Parts List will be helpful if presented with the
power tool to the 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.
MODIFICATIONS
Hitachi Power Tools are constantly being improved
and modified to incorporate the latest technological
advancements.
Accordingly, some parts (i.e. code numbers and/or
design) may be changed without prior notice.
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