Inherent Drawbacks Of Cordless Saber Saw Requiring Particular Attention During Sales Promotion - Hitachi CR 24DV Technical And Service Manual

7-2. Inherent Drawbacks of Cordless Saber Saw Requiring Particular Attention during Sales Promotion

The cordless saber saw 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, any cordless tool has certain inherent drawbacks.
Salespersons must be thoroughly familiar with these drawbacks in order 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) Do not insert a foreign object into body vent holes.
The body of this tool has vent holes for improving the cooling efficiency. As a fan is built into the motor, a
foreign object inserted through a vent hole may cause a failure. Please instruct customers to never insert a
foreign object into the vent hole.
(2) Avoid "locking" of the motor
Locking of the motor will cause an overload current that could result in burning of the motor and/or rapid
deterioration of the battery. Salespersons should advice the customer to immediately release the switch and
stop operation if the motor becomes locked.
(3) Variation in amount of work possible per charge
Although the nominal chargeable capacity of the storage batteries used with the Model CR 24DV is 2.0 Ah and
3.0 Ah, the actual capacity may vary within 10% of that value depending on the ambient temperature during
use and charging, and the number of times the batteries have been recharged. It should 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 workpiece, sharpness of the saw blades, etc.) and
operational skill of the user.
B. Suggestions and precautions for the efficient use of the charger and storage batteries
If the Model EB 2420 Storage Battery is exposed to direct sunlight for an extended period or if the tool has just
been operated for a long time, charging may not be possible if the temperature of the battery is above 60˚C
(140˚F). If the Model EB 2430HA Storage Battery is exposed to direct sunlight for an extended period or if the tool
has just been operated for a long time, charging may not be possible if the temperature of the battery is above
45˚C (113˚F). In such a case, the customer should be advised to place the battery in a shaded area with a good
airflow, and allows sufficient cooling before recharging. This phenomenon is common to all existing batteries and
chargers which employ temperature sensitive overcharge protection devices. The cooling time required before
recharging can be accomplished varies from a few minutes to 30 minutes, depending on the load, duration of use,
and ambient temperature.
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