Fig. 20

English

MAINTENANCE AND INSPECTION

WARNING: To avoid serious accident, ensure the switch is in the OFF position and disconnect the plug from the receptacle during maintenance and inspection.

1.Inspecting the saw blade:

Since use of a dull saw blade will degrade efficiency and cause possible motor malfunction, sharpen or replace the saw blade as soon as abrasion is noted.

CAUTION:

If a dull saw blade is used, reactive force is increased during cutting operation. Avoid the use of the dull saw blade without repair.

2.Check the screws

Loose screws are dangerous. Regularly inspect them and make sure they are tight.

CAUTION: Using this power tool with loosened screws is extremely dangerous.

3.Inspecting the carbon brushes (Fig. 20)

The motor employs carbon brushes which are consumable parts. Replace the carbon brush with a new one when it becomes worn to its wear limit. Always keep carbon brushes clean and ensure that they slide freely within the brush holders.

 

 

Wear limit

 

 

38

 

(6mm)

0.24"

No. of carbon

0.67"

 

 

 

 

brush

(17mm)

 

CAUTION:

Using this circular saw with a carbon brush which is worn in excess of the wear limit will damge the motor.

NOTE: Use HITACHI carbon brush No. 38 indicated in Fig. 20.

4. Replacing carbon brushes:

Remove the brush caps with a slotted-head screwdriver. The carbon brushes can then be easily removed. (Fig. 21)

5. Performance checkup and maintenance of

safety cover

 

Keep the safety cover in good shape for smooth

 

performance at all times. Be sure to make

 

prompt repair in case of any malfunction.

 

6. Adjusting the base and saw blade to

 

maintain perpendicularity

 

The angle between the base and the saw blade

Brush Cap Slotted-head

has been adjusted to 90°, however should this

Screwdriver

 

 

Fig. 21

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Image 19
Hitachi C 7SB2, C 7BD2 instruction manual Maintenance and Inspection