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MAINTENANCE AND INSPECTION
WARNING
Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance and inspection.
1.
Inspecting the tool bits
Since use of a dull tool will cause motor malfunctioning
and degraded effi ciency, replace the tool 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 loose,
retighten them immediately.
WARNING
Using this Rotary Hammer with loosen screws is
extremely dangerous.
3.
Maintenance of the motor
The motor unit is the very "heart" of the power tool.
Exercise due care to ensure the motor 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. When they become worn to or near
"wear limit", it could result in motor trouble.
When an auto-stop carbon brush is equipped, the
motor will stop automatically. At that time, replace both
carbon brushes with new ones which have the same
carbon brush Nos. shown in the fi gure.
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.
12
No.43 : 0.24"(6 mm)
No.73 : 0.28"(7 mm)
Fig. 20
○
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.
Grease replacement
This Rotary Hammer is of full air-tight construction to
protect against dust and to prevent lubricant leakage.
Therefore, this Rotary Hammer can be used without
lubrication for long periods. Replace the grease as
described below.
○
Grease Replacement Period
After purchase, replace grease after every 6 months
of usage. Ask for grease replacement at the nearest
authorized Service Center.
6.
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.
7.
Service parts list
CAUTION
Repair, modifi cation and inspection of Hitachi
Power Tools must be carried out by a Hitachi
Authorized Service Center.
This Parts List will be helpful if presented with
the tool to the Hitachi Authorized Service Center
when requesting repair or other maintenance.
In the operation and maintenance of power tools,
the safety regulations and standards prescribed
in each country must be observed.
MODIFICATIONS
Hitachi Power Tools are constantly being improved
and modifi ed to incorporate the latest technological
advancements.
Accordingly, some parts may be changed without prior
notice.
