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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 effi ciency, 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. 20)
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 metabo HPT Carbon Brush Code No.
328481.
0.37" (9.5 mm)
5. Replacing carbon brushes
Take out the carbon brush by fi rst removing the brush
cap and then hooking the protrusion of the carbon
brush with a fl at head screw driver, etc., as shown in
Fig. 21.
Wear limit
0.12" (3 mm)
Fig. 20
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 fi nger as illustrated in Fig. 23. 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.
Nail of carbon brush
English
Fig. 21
Protrusion of
carbon brush
Fig. 22
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