Manual Hitachi CM9UBY (page 10 of 56) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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⅜ If excessive force is applied to the diamond wheel

to make it align with the cutting line during cutting,

this might not only overload the motor and cause

burn damage but may also overheat the diamond

wheel and shorten the service life.

⅜ Secure the workpiece. A workpiece clamped with

clamping devices or in a vice is held more securely

than by hand.

⅜ Take care not to allow the power cord to come into

contact with the diamond wheel during operation.

⅜ When the work is completed, turn the power off

and disconnect the power plug from the receptacle.

MAINTENANCE AND INSPECTION

1. Inspection the diamond wheel

A worn diamond wheel overloads the motor and

reduces working efficiency. Replace with a new one.

2. Diamond wheel clogging

The rate of wear of the diamond layer cutting edge

will vary depending on the type of material being

cut, the cutting speed, etc. In general, materials

which produce granular cutting particles may scrape

the bodying agent and hasten the wear of the

diamond layer. On the other hand, materials which

produce powdery cutting particles may cause

clogging of the diamond layer which will reduce

cutting efficiency. When clogging occurs, additional

force applied in an attempt to increase cutting speed

will sometime cause sparks to appear around the

circumference of the diamond wheel. In such a case,

stop using the cutter and carefully inspect the cutting

edge by rubbing it with your fingers. If the diamond

layer feels smooth (no roughness or abrasiveness),

it is clogged with dust and must be “dressed”.

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. 6)

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

CM9UBY (Fig. 7)

(1) Loosen the D4 tapping screw retaining the brush

cover and remove the brush 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 from the brush holder.

(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 brush cover and tighten the D4 tapping

screw.

CM9SR

Disassemble the brush cap with a slotted-head

screwdriver. The carbon brush can then be easily

removed.

7. Service parts list

CAUTION:

Repair, modification and inspection of Hitachi Power

Tools must be carried out by a 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 may be changed without

prior notice.

GUARANTEE

We guarantee Hitachi Power Tools in accordance with

statutory/country specific regulation. This guarantee does

not cover defects or damage due to misuse, abuse, or

normal wear and tear. In case of complaint, please send

the Power Tool, undismantled, with the GUARANTEE

CERTIFICATE found at the end of this Handling instruction,

to a Hitachi Authorized Service Center.

NOTE

Due to HITACHI’s continuing program of research and

development, the specifications herein are subject to

change without prior notice.

01Eng_CM9SR_WE 6/30/08, 18:169

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Hitachi CM9UBY Manual

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