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(4) Tightening conditions
The tightening torque differs according to the torque ratio, class, and length of bolts even when bolts with the same
size threads are used. The tightening torque also differs according to the condition of the surface of workpiece
through which the bolts are to be tightened. When the bolt and nut turn together, torque is greatly reduced.
(5) Using optional parts (Impact wrench)
The tightening torque is reduced a little when an extension bar, universal joint or a long socket is used.
(6) Clearance of the socket (Impact wrench)
A worn or deformed hex. or a square-holed socket will not give an adequate tightness to the fitting between
the nut or anvil, consequently resulting in loss of tightening torque.
Using an improper socket which does not match to the bolt will result in an insufficient tightening torque.
CAUTION:
Pull out battery before doing any inspection or maintenance.
1.
Checking the condition of the bit (Impact driver)
The bits should be checked regularly. If worn or broken bits can slip or decrease the efficiency of the motor and burn it out.
Replace worn bits with new ones.
CAUTION:
If you use a driver bit of which point is worn or broken, it will be dangerous since it slips. So replace it with a new one.
2.
Checking the condition of the socket (Impact wrench)
A worn or deformed hex. or a square-holed socket will not give an adequate tightness to the fitting between
the nut or anvil, consequently resulting in loss of tightening torque. Pay attention to wear of a socket holes
periodically, and replace with a new one if needed.
3.
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.
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. 13)
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"
P. 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.
6.
Replacing carbon brushes
Take out the carbon brush by first removing the brush cap and then hooking the protrusion R of the carbon
brush with a flat head screw driver, etc., as shown in Fig. 15.
When installing the carbon brush, choose the direction so that the nail Q of the carbon brush agrees with the contact
portion outside the brush tube S. Then push it in with a finger as illustrated in Fig. 16. 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.
7.
Check for Dust
Dust may be removed with a soft cloth or a cloth dampened with soapy water.
Do not use bleach, chlorine, gasoline or thinner, for they may damage the plastics.
8.
Disposal of the exhausted battery
WARNING:
Do not dispose of the exhausted battery. The battery must explode if it is incinerated. The product that you
have purchased contains a rechargeable battery. The battery is recyclable. At the end of it's useful life, under
various state and local laws, it may be illegal to dispose of this battery into the municipal waste stream.
Check with your local solid waste officials for details in your area for recycling options or proper disposal.
9.
Storage
Storing in a place below 104°F (40°C) and out of the reach of children.
10. Service and repairs
All quality power tools will eventually require servicing or replacement of parts because of wear from normal
use. To assure that only authorized replacement parts will be used, all service and repairs must be performed
by a HITACHI AUTHORIZED SERVICE CENTER, ONLY.
MAINTENANCE AND INSPECTION
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