Hitachi C 7D instruction manual Maintenance and Inspection

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MAINTENANCE AND INSPECTION

CAUTION: Pull out battery before doing any inspection or maintenance.

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.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.

4.Inspecting the carbon brushes (Fig. 25)

The motor employs carbon brushes which are consumable parts. Since and excessively worn carbon brush can result in motor trouble, replace the carbon brush with new ones when it becomes worn to or near the “wear limit”. In addition, always keep carbon brushes clean and ensure that they slide freely within the brush holders.

NOTE:

When replacing the carbon brush with a new one, be sure to use the Hitachi Carbon Brush Code No. 999058.

5.Replacing carbon brushes

Take out the carbon brush by first removing the brush cap and then hooking the protrusion of the carbon brush with a slotted-head screw driver, etc., as shown in Fig. 26, Fig. 27.

When installing the carbon brush, choose the direction so that the nail of the carbon brush (Fig. 27) agrees with the contact portion outside the brush tube (Fig. 28). Then push it in with a finger.

Lastly, install the brush cap.

Wear limit

0.12″ (3mm)

0.45″

(11.5mm)

Fig. 25

Fig. 26

27