Hitachi dh18dl MAINTENANCE AND INSPECTION

English

8.Switching between the “SAVE“ and the “POWER“ modes

The hammering force of the hammer can be increased or decreased to conform with intended usage, by operating the shift knob as per Fig. 25. Adjust the force to match the usage intended.

“SAVE“ mode

“POWER“ mode

Shift knob

Fig. 25

(1)“SAVE“ mode ... decreased hammering force This can prevent thin drill bits which are less than

4.3mm in diameter, from being bent or broken.

(2)“POWER“ mode ... increased hammering force  This can be used to speedily and efficiently drill

holes when the drill bits which are being used are greater than 4 mm in diameter.

 This can be used to drill holes into wood or metal.

CAUTION:

Do not drill holes in wood with the “SAVE“ mode. There is a likelihood that the motor will burn out because it can easily lock up due to the low power.

MAINTENANCE AND INSPECTION

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

1.Inspecting the drill bits

Since use of a dull tool will cause motor malfunctioning and degraded efficiency, replace the drill bit with a new one or resharpening without delay when abrasion is noted.

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.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.

4.Inspecting the carbon brushes (Fig. 17)

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. 328481.

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 flat head screw driver, etc., as shown in Fig. 18.

When installing the carbon brush, choose the direction so that the nail of the carbon brush agrees with the contact portion outside the brush tube. Then push it in with a finger as illustrated in Fig. 19. Lastly, install the brush cap.

CAUTION:

●Be absolutely sure to insert the nail of the carbon brush into the contact portion outside the brush tube. (You can insert whichever one of the two nails provided.)

●Caution must be exercised since any error in this operation can result in the deformed nail of the carbon brush and may cause motor trouble at an early stage.

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