Hitachi DH40MB - Manual (Page 29)

28
English
hammer drill to an extent that shavings are freely
discharged.
CAUTION:
Although this machine is equipped with a safety
clutch, if the drill bit becomes bound in concrete
or other material, the resultant stoppage of the drill
bit could cause the machine body to turn in reaction.
Ensure that the main handle and side handle are
gripped firmly during operation.
2. How to chisel or crush (Fig. 5)
By applying the tool tip to the chiseling or crushing
position, operate the hammer drill by utilizing its
empty weight.
Forcible pressing or thrusting is unnecessary.
3. When drilling at “rotation + hammering”:
CAUTION:
If you switch the selector lever during motor rotation,
the tool can start to rotate abruptly, resulting in
unexpected accidents. Be sure to switch the selector
lever when the motor is at a complete stop.
(1) Switching to “rotation + hammering”
(a) Pull the selector lever, release lock and turn it
clockwise.
(b) Align
▲ of the selector lever with ▲ on the
side of the undercover as illustrated in Fig. 6.
(c) Push in the selector lever to lock it.
NOTE:
Turn the selector lever (do not pull it up) to check
if it is completely locked and make sure that it does
not turn.
4. When chipping and chiseling at “hammering”:
CAUTION:
⅜ If the selector lever is switched during motor rotation,
the tool can start to rotate abruptly, resulting in
unexpected accidents. Make sure to switch the
selector lever when the motor is at a complete stop.
⅜ If the bull point or cold chisel is used at the position
of ”rotation + hammering”, the tool can start to
rotate, resulting in unexpected accidents. Make
sure that they are used at the position of
”hammering”.
(1) Switching to ”hammering”
(a) Pull the selector lever, release lock and turn it
counterclockwise.
(b) Align
▲ of the selector lever with ▲ on the
side of the undercover as illustrated in Fig. 7.
(c) Push in the selector lever to lock it.
NOTE:
Turn the selector lever (do not pull it up) to check
if it is completely locked and make sure that it does
not turn.
(2) When fixing working positions of tools such as cold
chisel, etc.,
(a) Pull the selector lever, release lock and turn it.
Align
▲ of the selector lever and of the
undercover as illustrated in Fig. 8.
(b) Push in the selector lever to lock it.
(c) Turn the grip as illustrated in Fig. 9 and fix the
tool to the desired working direction.
(d) Switch the selector lever to “hammering”
according to the procedures mentioned in the
above item (1) and secure the position of the
tool.
5. Install the stopper (Fig. 10)
(1) Loosen the side handle and insert the straight portion
of the stopper into the handle bolt hole.
(2) Move the stopper to the specified position and
rotate the grip of the side handle clockwise to fix
the stopper.
6. Warming up (Fig. 11)
The grease lubrication system in this unit may
require warming up in cold regions.
Position the end of the bit so makes contact with
the concrete, turn on the switch and perform the
warming up operation. Make sure that a hitting
sound is produced and then use the unit.
CAUTION:
When the warming up operation is performed, hold
the side handle and the main body securely with
both hands to maintain a secure grip and be careful
not to twist your body by the jammed drill bit.
DRILLING AND DRIVING-IN OPERATIONS
FOR ANCHORS
1. When a taper shank adapter is used. (Fig. 12)
(1) Install drill bit with taper shank in the taper shank
adapter.
(2) Turn the power on and drill a base hole to the depth
sounded by indicating groove on the drill bit.
(3) After cleaning out dust with a syringe, attach the
plug to the anchor tip and drive in the anchor with
a manual hammer.
(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 manual hammer
supporting on a rest. (Fig. 13)
USING DRILL CHUCK, CHUCK ADAPTER
Note that this machine can be used at “rotation only”
if separately sold parts such as drill chuck and chuck
adapter are attached. Use it with the selector lever
positioned at “rotation + hammering”.
CAUTION:
During operation, be sure to grip the handle and the
side handle firmly to prevent your body from swaying.
(1) Switching to “rotation + hammering”
For switching to “rotation + hammering”, follow the
same procedures mentioned in [3. When drilling at
“rotation + hammering”].
(2) Attaching chuck adapter to drill chuck (Fig. 14)
(a) Attach the chuck adapter to the drill chuck.
(b) The SDS max shank of the chuck adapter is
equivalent to the drill bit. Therefore, follow the
same procedure as [How to install tool] for
attaching and detaching.
(3) Drilling
(a) Even if you apply more-than-required pressure
to the machine body, drilling can never be
performed as quickly as you expect. Applying
more force or pressure to the machine body
than what is needed, on the contrary, damages
the drill tip, resulting in the declined working
efficiency and shortened life of this machine.
(b) A drill can snap sometimes when drilling is
almost finished. It is important to relax your
thrusting pressure when drilling is nearing the
end.