Precautions Requiring Particular Attention During Sales Promotion; Reference Materials - Hitachi DH 25DL Technical Data And Service Manual

2. Precautions requiring particular attention during sales promotion

The cordless rotary hammer offers many advantages: it can be used in places where no power source is
available, the absence of a cord allows easy use, etc. However, in comparison with conventional AC type
impact drills and hammer drills, there are certain precautions which require particular attention.
Salespersons must be thoroughly familiar with the following points to properly advise the customer in the
most efficient use of the tool.
A. Suggestions and precautions for the efficient use of the tool
(1) Appropriate drilling capacity of the Model DH 25DL/DH 25DAL/DH 36DL/ DH 36DAL
The Models DH 25DL, DH 25DAL, DH 36DL and DH 36DAL are not capable of drilling several dozens
of holes like a conventional AC type impact or hammer drill because it is a cordless rotary hammer
powered by a battery. If the customer wishes to use the tool to drill many holes in succession, please
recommend that a spare battery should be kept available for use.
(2) Use thrust within the range of 10 to 15 kg
Applying heavy thrust (pressure) on the tool, such as is possible with AC type impact and hammer drills,
will not accelerate the drilling speed. On the contrary, excessive pressure will reduce bit rotation and
hammering speed, and cause the storage battery to rapidly lose its charge.
(3) Variation in amount of work possible per charge
Although the nominal capacity of the storage batteries used with the Models DH 25DL/DH 25DAL are
3.0 Ah Models DH 36DL/DH 36DAL are 2.6 Ah, the Actual capacity may vary within 10% of that value
depending on the ambient temperature during use and recharging, and the number of times the
batteries have been recharged. It should also be noted that other factors which may have a bearing on
the amount of work possible per charge are the working conditions (ambient temperature, type and
moisture content of the workpieces, sharpness of the drill bits, etc.) and the operational skill of the user.
(4) Precautions in drilling with metal drill bits.
Although the Models DH 25DL, DH 25DAL, DH 36DL and DH 36DAL are designed for a drilling capacity
of up to 13 mm in steel, its operational capabilities are considerably less than those of conventional AC
type impact drills. Especially when drilling with a 13 mm drill bit for steel, the drill tends to become
locked when the drill bit penetrates through the material. For this reason, the customer should be
cautioned to reduce the pressure on the main body of the tool when drilling completely through the
material to avoid locking the drill.
The main components of the striking mechanism section and the tool retainer section of the Models
DH 25DL and DH 36DL are common to those of the Model DH 24DV, and the main components of the
striking mechanism section and the tool retainer of the Models DH 25DAL and DH 36DAL are common to
those of the Model DH 24DVA. Refer to the Technical Data and Service Manuals of the Model DH 24DV
(No. G811) and the Model DH 24DVA (No. G842) for details of the following.
1. Lubrication
2. Tool structure
3. 3-mode changeover mechanism (Models DH 25DAL and DH 36DAL)
"Rotation only" and "Rotation and hammering" changeover mechanism (Models DH 25DL and DH 36DL)
4. "Rotation only" (no striking)
5. Drill bits
6. Tool retainer section
7. Dust collector (B)

REFERENCE MATERIALS

-11-