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6. How to install dust cover (Fig. 2)
Always install the dust cover on the drill bit or
the taper shank adaptor. Insert the dust cover
until it lies flush in the groove.
NOTE: For a thick drill bit, insert the dust cover
from drill rear.
7. How to install tool
CAUTION:
For tools such as a drill bit and a bull point, use only Hitachi genuine parts.
(1) Clean, then smear the tool shank with the
grease provided in the green tube.
(2) Pull the tool holder in the direction of arrow 1
and rotate it in the direction of arrow 2
(counterclockwise). Fully insert the tool shank
into the hexagonal hole of the front cover. (Fig.
3)
(3) Return the tool holder to fix the tool.
(4) Pull the tool to make sure it is locked
completely.
NOTE: Remove in the reverse order to
installation.
8. Regulating the number of rotations and
hammering (Fig. 4)
This Rotary Hammer is equipped with a built-
in electronic control circuit that can adjust and
regulate the number of rotations and times of
hammering. This Rotary Hammer can be used
by adjusting the dial, depending upon the
contents of operation, such as boring holes into
fragile materials, chipping, centering, etc.
The scale ‘1’ of the dial is designed for a
minimum speed with the number of 240
rotations per minute and 1320 times of blow
per minute. The scale ‘6’ is designed for a
maximum speed with the number of 480
rotations per minute and 2650 times of blow
per minute.
CAUTION:
Do not adjust the dial during operation. Doing so can result in injury because the
Rotary Hammer must be held by only one hand, disabling the steady control of the
Rotary Hammer.
Fig. 3
Tool Holder
Tool Shank
Dial
Fig. 4
Fig. 2
Dust cover
Insert up to the
groove
Front Cover
1
2
01Eng_DH40FR_US 5/23/07, 14:4911