Maintenance And Inspection - Hitachi DH 18VB Handling Instructions Manual

CAUTIONS:
Application of force more than necessary will not only
expedite work, but will deteriorate the tip edge of the
drill bit and reduce the service life of the hammer drill
in addition.
Drill bit may snap off while withdrawing the hammer
drill from the drilled hole. For withdrawing, it is
important to use a pushing motion.
Do not attempt to drill anchor holes or holes in concrete
with the machine set in the rotation only function.
Do not attempt to use the hammer drill in the rotation
and striking function with the drill chuck and chuck
adapter attached. This would seriously shorten the
service life of every component of the machine.
4. When driving machine screws (Fig. 10)
First, insert the bit into the socket in the end of the
chuck adapter (D).
Next, mount the chuck adapter (D) on the main unit
using procedures described in 5 (1), (2), (3), put the tip
of the bit in the slots in the head of the screw, grasp the
main unit and tighten the screw.
CAUTIONS:
Exercise care not to excessively prolong driving time,
otherwise, the screws may be damaged by excessively
force.
Apply the hammer drill perpendicularly to the screw
head when driving a screw; otherwise, the screw head
or bit will be damaged, or driving force will not be fully
transferred to the screw.
Do not attempt to use the hammer drill in the rotation
and striking function with the chuck adapter and bit
attached.
5. When driving wood screws (Fig. 10)
(1) Selecting a suitable driver bit
Employ plus-head screws, if possible, since the driver
bit easily slips off the heads of minus-head screws.
(2) Driving in wood screws
Prior to driving in wood screws, make pilot holes
suitable for them in the wooden board. Apply the bit
to the screw head grooves and gently drive the screws
into the holes.
After rotating the hammer drill at low speed for a while
until a wood screw is partly driven into the wood,
squeeze the trigger more strongly to obtain the
optimum driving force.
CAUTION:
Exercise care in preparing a pilot hole suitable for the
wood screw taking the hardness of the wood into
consideration. Should the hole the excessively small
or shallow, requiring much power to drive the screw
into it, the thread of the wood screw may sometimes
be damaged.
6. Using depth gauge (Fig. 11)
(1) Loosen the knob on the side handle, and insert the
depth gauge into the mounting hole on the side
handle.
(2) Adjust the depth gauge position according to the
depth of the hole and tighten the knob bolt securely.
7. How to use the drill bit (taper shank) and the taper
shank adapter
(1) Mount the taper shank adapter to the hammer drill.
(Fig. 12).
(2) Mount the drill bit (taper shank) to the taper shank
adapter. (Fig. 12)
(3) Turn the switch ON, and drill a hole in prescribed
depth.
(4) To remove the drill bit (taper shank), insert the cotter
into the slot of the taper shank adapter and strike the
head of the cotter with a hammer supporting on the
rest. (Fig. 13)
LUBRICATION
Low viscosity grease is applied to this hammer drill so
that it can be used for a long period without replacing the
grease. Please contact the nearest service agent for grease
replacement when any grease is leaking from loosened
screw.
Further use of the hammer drill despite the grease shortage
causes seizure to reduce the service life.
CAUTION:
A specific grease is used with this machine, therefore, the
normal performance of the machine may be badly affected
by use of other grease. Please be sure to let one of our
service agents undertake replacement of the grease.

MAINTENANCE AND INSPECTION

1. Inspection the drill bits
Since use of a dull tool 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.
NOTE:
Due to HITACHI's continuing porgram 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: 87 dB (A).
The typical sound power level: 100 dB (A).
Wear ear protection.
The typical weighted root mean square acceleration value
2
does not exceed 2.5m/s
English
.
33