Hitachi DH 24DVA Technical Data And Service Manual page 6

4-1-3. Greatest demolishing performance in the 24-V class
The demolishing performance of the Model DH 24DVA is 1.4 times higher than C and 1.1 times higher than P
thanks to the efficient transmission of the hammering energy.
4-1-4. Internal pressure adjustment mechanism
By minimizing variations in the internal pressure during operation, hammering operation is stabilized. In addition,
idling and grease leakage can be prevented.
4-1-5. Switchable hammering force mechanism increases working efficiency
The Model DH 24DVA is equipped with the same mechanism as the Model DH 24DV to switch the hammering
force between "POWER" mode and "SAVE" mode for proper adjustment of the hammering force.
Change lever
Shift knob
<Drilling holes in concrete>
"POWER"
mode
(Powerful
hammering
force)
<Drilling holes in concrete>
Suitable for drilling holes
"SAVE"
in 4.8 mm or less diameter
mode
with suppressed motor
(Suppressed
power (preventing the bit
hammering
from being bent)
force)
"Rotation + hammering"
Suitable for drilling holes
in 5 mm or more diameter
with high motor power
(speedy and efficient
drilling)
"Rotation only"
<Drilling holes in steel and wood>
Suitable for drilling holes
in steel and wood
speedily with high motor
power
<Nonusable>
Do not use the Model
DH 24DVA for high-load
operation in this mode
because the motor power
is suppressed.
(Otherwise, the motor
may be burnt out.)
--- 3 ---
"Hammering only"
<Demolishing concrete>
Suitable for demolishing
hard materials such as
concrete with high motor
power
<Demolishing blocks>
Suitable for demolishing
brittle materials such as
blocks and bricks with
suppressed motor power