Maintenance And Inspection - Hitachi WH 14DMR Tp1692En

English
(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. 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.
6. 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. 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.
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.
14

MAINTENANCE AND INSPECTION

Wear limit
3mm
11.5mm
Fig. 14
Nail of carbon brush
Protrusion
of carbon
brush
Fig. 15
Fig. 16