English
Tightening torque
kgf•cm |
| N•m |
| M10⋅30 | |||
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1600 |
| 160 |
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1400 |
| 140 | High | tension |
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1200 |
| 120 |
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1000 |
| 100 |
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800 |
| 80 |
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Ordinary bolt
60060
40040
20020
00
0 1 2 3
Tightening time: sec.
(Steel plate thickness t = 10 mm)
Tightening torque
kgf•cm | N•m | M12⋅45 |
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1600 | 160 |
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1400 | 140 | High tension |
bolt | ||
1200 | 120 |
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1000 | 100 |
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800 | 80 | Ordinary bolt |
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60060
40040
20020
00
0 1 2 3
Tightening time: sec.
(Steel plate thickness t = 25 mm)
Tightening torque
kgf•cm N•m |
| M14⋅50 | |||||
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1600 | 160 |
| High tension |
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1400 | 140 |
| bolt |
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1200 | 120 |
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1000 | 100 |
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Ordinary bolt
80080
60060
40040
20020
0 0
0 1 2 3
Tightening time: sec.
(Steel plate thickness t = 25 mm)
Fig. 18
Bolt
Steel plate thickness t
Nut | Fig. 19 |
*The following bolt is used. Ordinary bolt: Strength grade 4.8 High tensile bolt: Strength grade 12.9
( | Explanation of strength grade: | ) | |
4 | — Yield point of bolt: 32 kgf/mm2 | ||
8 | — Pulling strength of bolt: 40 kgf/mm2 | ||
MAINTENANCE AND INSPECTION
1.Inspecting the driver bit
Using a broken bit or one with a worn out tip is dangerous because the bit can slip. Replace it.
2.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 may result in serious hazard.
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. 14)
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. 999054.
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. 16.
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. 17. 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.
6.Cleaning of the outside
When the impact driver is stained, wipe with a soft dry cloth or a cloth moistened with soapy water. Do not use chloric solvents, gasoline or paint thinner, as they melt plastics.
7.Storage
Store the impact driver in a place in which the temperature is less than 40°C, and out of reach of children.
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