Maintenance And Inspection - Hitachi DH 28PC Mode D'emploi Et Instructions De Securite

MAINTENANCE AND INSPECTION

WARNING:
Be sure to switch power OFF and disconnect the plug from the receptacle
during maintenance and inspection.
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. Inspecting the screws
Regularly inspect all screws and ensure
that they are properly tightened. Should
any of the screws be loosened, retighten
them immediately.
WARNING:
Using this rotary hammer with loosen
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.
23)
The motor employs carbon brushes
which are consumable parts. When they
become worn to or near "wear limit", it
could result in motor trouble. At that
time, replace both carbon brushes with
new ones which have the same carbon
brush Nos. shown in the figure.
In addition, always keep carbon brushes
clean and ensure that they slide freely
within the brush holders.
CAUTION:
Using this rotary hammer with a carbon
brush which is worn in excess of the wear
limit will damage the motor.
04
0.67" (17 mm)
Fig. 23
NOTE: Use HITACHI carbon brush No.04
indicated in Fig. 23.
Replacing carbon brushes:
(For parts name, refer to Fig. 1)
Loosen the two set screws and remove
the tail cover. Remove the brush caps
and carbon brushes. After replacing the
carbon brushes, tighten the brush caps
securely and to install the tail cover with
securely tightening two set screws.
5. How to replase grease
This machine is full air-tight construction
to protect against dust and to prevent
lubricant leakage. Therefore, the
machine can be used without lubrication
for long periods. Replace the grease as
described below.
Grease replacement period
You should look at the grease when you
change the carbon brush. (See item 4 in
the section MAINTENANCE AND
INSPECTION.)
replacement at the nearest HITACHI
Authorized Service Center. Proceed for
replacement of grease.
English
Wear limit
No. of carbon brush
0.24" (6 mm)
Ask for grease
15