Hitachi CM 5SB Handling Instructions Manual page 31

For thorough dressing, approximately 5 meters of
slightly accelerated cutting at a depth of 10mm in
a relative soft material which produces granular
cutting particles (such as a cement block or brick)
will restore the cutting effectiveness of the diamond
layer and will extend the service life of the diamond
wheel.
The diamond material is susceptible to high
temperatures and will begin to deteriorate at
approximately 600°C. Higher temperatures will cause
decomposition of the diamond material. Accordingly,
it is important to perform "dressing" as soon as
clogging or sparking occurs.
3. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure
that they are properly tightened. Should any of the
screws be loose, retighten them immediately. Failure
to do so could result in serious hazard.
4. Maintenance of the motor
The motor unit winding is the very "heart" of the
power tool.
Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
5. Inspecting the carbon brushes (Fig. 5)
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 (Fig. 6)
<Disassembly>
(1) Loosen the D4 tapping screw retaining the tail cover
and remove the tail cover.
(2) Use the auxiliary hexagonal wrench or small
screwdriver to pull up the edge of the spring that
is holding down the carbon brush. Remove the edge
of the spring toward the outside of the brush holder.
(3) Remove the end of the pig-tail on the carbon brush
from the terminal section of brush holder and then
remove the carbon brush form the brush holder.
<Assembly>
(1) Insert the end of the pig-tail of the carbon brush
in the terminal section of brush holder.
(2) Insert the carbon brush in the brush holder.
(3) Use the auxiliary hexagonal wrench or small
screwdriver to return the edge of the spring to the
head of the carbon brush.
(4) Mount the tail cover and tighten the D4 tapping
screw.
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 to 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: 110 dB (A).
Measured A-weighted sound pressure level: 99 dB (A).
Uncertainty KpA: 3 dB (A).
Wear hearing protection.
Vibration total values (triax vector sum) determined
according to EN60745.
Vibration emission value
Uncertainty K = 1.5 m/s 2
The declared vibration total value has been measured in
accordance with a standard test method and may be used
for comparing one tool with another.
It may also be used in a preliminary assessment of
exposure.
WARNING
The vibration emission during actual use of the
power tool can differ from the declared total value
depending on the ways in which the tool is used.
Identify safety measures to protect the operator that
are based on an estimation of exposure in the actual
conditions of use (taking account of all parts of the
operating cycle such as the times when the tool is
switched off and when it is running idle in addition
to the trigger time).
English
a
= 4.5 m/s 2
h
30