Maintenance And Inspection - Hitachi D 13VB2 Handling Instructions Manual

PRACTICAL HANDLING PROCEDURES
1. Speed adjustment and switch operation
The drill speed can be adjusted from 0 through full
speed by regulating the trigger-squeezing force.
The more the trigger is squeezed, the faster the drill
rotates. When the trigger is squeezed fully, the
speed is the maximum. (for D13VB2)
Pulling the trigger switch and pushing the stopper,
it keeps the switched-on condition which is conve-
nient for continuous running. When switching off,
the stopper can be disconnected by pulling the
trigger again.
2. Pressure
Drilling will NOT be accelerated by applying heavy
preasure on the drill. Such action will only result
in a damaged drill bit, decreased drilling efficiency,
and/or shortended service life of the drill.
3. Using a large diameter drill bit
The larger drill bit diameter, the larger reactive
force on your arms. Be careful not to lose control
of the drill because of this reactive force. To maintain
firm control, establish a secure foothold, hold the
drill tightly with both hands, and ensure that the
drill is perpendicular to the material being drilled.
4. 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 pushing force when drilling
through the material.
5. Precaution on Boring
The drill bit may become overheated during opera-
tion; however, it is sufficiently operatable.
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 motor. Always
pay attention to this undesirable possibility.

MAINTENANCE AND INSPECTION

1. Inspecting 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 ferquently and replace it 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. Fail-
ure 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 (Fig. 8)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn car-
bon brush can result in motor trouble, replace the
carbon brushes with new ones having the same
carbon brush No. shown in the figure when it
becomes worn to or near the "wear limit". In
addition, always keep carbon brushes clean and
ensure that they slide freely within the brush holders.
5. Replacing carbon brushes (Fig. 9)
Disassembling
(1) Loosen the three screws on the handle cover, and
remove the handle cover.
(2) Lift out the brush holders together with the carbon
burshes, while being very careful not to forcibly pull
the lead wires within the brush holders.
(3) Withdraw the brush terminals, and remove the
carbon brushes from the brush holders.
Reassembling
(1) Place new carbon brushes into the brush holdres,
and connect the brush terminals to the carbon
brushes.
(2) Return the brush holders and other parts to their
original positions, an illustrated in Fig. 9.
(3) Place the lead wires in the specified position.
Be very careful not to allow the lead wires to
contact the armature or rotating parts of the motor.
(4) Mount the handle cover, while being careful to
ensure it does not pinch the lead wires, and secure
it firmly with the three screws.
CAUTION
Should the lead wire be pinched by the handle
cover or come in contact with the armature or
rotating parts of the motor, a srerious danger of
electric shock to the operator will be created. Exercise
extreme caution in disassembling and reassembling
the motor, follow the above procedure exactly.
DO NOT attempt to disassembly any parts other
than those necessary to effect replacement of the
carbon brushes.
NOTE
Due to HITACHI's continuing program of research and
development, the specifications herein are subject to
change without prior notice.
Information concerning airborne noise and vibration
The measured values were determined according to
EN50144.
The typical A-weighted sound pressure level: 100 dB (A)
The typical A-weighted sound power level: 113 dB (A)
Wear ear protection.
The typical weighted root mean square acceleration
value does not exceed 2.5m/s
English
2 .
17