Hitachi DH 50MB Handling Instructions Manual page 11

4. Regarding indication lamp (red) for carbon brush
replacement (Fig.22)
When the time for carbon brush replacement nears,
an indication lamp will light up in red as you turn
the switch on. When the indication lamp lights up,
replace both carbon brushes with new ones as early
as you can.
The indication lamp will light up approximately 10
hours before the service life of the carbon brushes
ends.
5. Inspecting the carbon brushes (Fig. 23)
The Motor employs carbon brushes which are
consumable parts. When they become worn to or
near the "wear limit", it could result in motor trouble.
When an auto-stop carbon brush is equipped, the
motor will stop automatically. At that time, replace
both carbon brushes with new ones which have the
same carbon brush Numbers shown in the figure.
In addition, always keep carbon brushes clean and
ensure that they slide freely within the brush holders.
6. Replacing carbon brushes
Loosen the tapping screws and remove the brush
cap cover. Then, remove the brush caps and take
out the carbon brushes. After replacement, be sure
to fasten the brush caps and fix the brush cap cover
firmly using the tapping screws.
7. Service parts list
A: Item No.
B: Code No.
C: No. Used
D: Remarks
CAUTION:
Repair, modification and inspection of Hitachi Power
Tools must be carried out by an Hitachi Authorized
Service Center.
This Parts List will be helpful if presented with the
tool to the Hitachi Authorized Service Center when
requesting repair or other maintenance.
In the operation and maintenance of power tools,
the safety regulations and standards prescribed in
each country must be observed.
MODIFICATIONS:
Hitachi Power Tools are constantly being improved
and modified to incorporate the latest technological
advancements.
Accordingly, some parts (i.e. code numbers and/or
design) may be changed without prior notice.
NOTE:
Due HITACHI's continuing program of research and
development, the specifications herein are subject to
change without prior notice.
Information concerning airborne noise and vibration
The measured values were determined according to
EN60745 and declared in accordance with ISO 4871.
Measured A-weighted sound power level: 99 dB (A)
Measured A-weighted sound pressure level: 88 dB (A)
Uncertainty KpA: 3 dB (A).
Wear ear protection.
The typical weighted root mean square acceleration value:
9.5 m/s 2 .
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