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4-1. Selling Point Descriptions
4-1-1. High chipping and demolishing performance with low vibration and noise level
Demolition performance is 1.2 to 1.5 times higher than that of similar products thanks to the 12.5 J impact energy
and efficient striking. The chipping performance is 1.2 to 1.5 times higher than that of similar products. Even so,
the Model H 45MR produces equivalent or lower vibration and sound levels than those of similar products.
4-1-2. Self-chiseling (Good feeling)
Thanks to the computer-simulated optimum striking characteristics, the quantity of body jumping is less than that
of the current Model H 45MA and the working tool smoothly penetrates into the workpiece with a light pressing
force. The Model H 45MR realizes quicker self-chiseling with better impact feeling.
4-1-3. Internal double-insulation construction with sturdy aluminum frame
The aluminum die-cast outer frame is very sturdy (highly rigid). In addition, a plastic internal S holder is adopted
to realize double-insulation construction. Thus the housing has greater rigidity and the double-insulated motor
has greater durability. The Model H 45MR is heavy-duty and the service life of the carbon brush is greatly
prolonged (3 times longer than the conventional one) minimizing disconnection of the armature, deviation of the
core and grease leakage.
4-1-4. A highly reliable mechanism for prevention of idle hammering and shock-absorbing mechanism results
in prolonged service life and comfortable operation
Conventional mechanism for prevention of idle hammering is to open and close the air holes according to the
movement of the striker. The Model H 45MR has air holes located at the position unaffected by the rebound of
the striker at no load. The air holes are opened and closed by the movement of sleeve (A) provided around the
cylinder that interlocks with the tool and the second hammer to prevent idle hammering. This mechanisms
securely prevents idle hammering even in wall hammering works or even if a tool that can cause great rebound on
the striker such as a cutter is used. Thanks to the highly reliable mechanism for prevention of idle hammering, the
service life of the Model H 45MR is prolonged and hammering works requiring much attention not to break the
surroundings can be efficiently performed with the Model H 45MR. At the instance of releasing the bull point from
the concrete by moving the main body up, the second hammer contacts hammer holder (A) then the cushion
(damper (A)) provided between hammer holder (A) and the front cover absorbs the striking force of the second
hammer. Thus the Model H 45MR has greater durability than the similar products.
* C and B: Equipped with constant speed control
Ratio of demolished weight
Full-load vibration level
Full-load noise level
No-load noise level
100
119.0
95.9
82.5
66
119.5
95.6
86.7
67
119.5
94.7
*82.7
86
122.0
95.3
*85.4
HITACHI
H 45MR
HITACHI
H 45MA
C
B
%
dB (VL)
dB (A)
dB (A)
Impact energy
Maximum compressed air force (piston force)
Quantity of body jumping
40% up (9.0 J to 12.5 J)
About 30% down
About 45% down
Maker • Model
Summary of Contents for H 45MR
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