How To Use The Demolition Hammer; Grease Replacement; Maintenance And Inspection - Hitachi H 41SD Handling Instructions Manual

HOW TO USE THE DEMOLITION HAMMER

(Fig. 2)
1. After placing the tip of the tool on concrete surface,
switch ON.
2. By utilizing the weight of the machine and by fi rmly
holding the demolition hammer with both hands, one
can eff ectively control the subsequent recoil motion.
Proceed at a moderate work-rate, the use of too much
force will impair effi ciency.

GREASE REPLACEMENT

This machine is of full air-tight construction to protect
against dust and to prevent lubricant leakage. This
machine can be used without grease supplement for an
extended period of time. However, perform the grease
replacement to maintain the service life. Replace the
grease as described below.
1. Grease replacement period
Inspect the grease amount according to the timing
replacement period of the carbon brush. (See the
section MAINTENANCE AND INSPECTION.) Ask for
grease replacement at the nearest authorized Hitachi
Service Center.
In the case that you are forced to change the grease by
yourself, please follow the following points.
2. How to replace grease
CAUTION
Before replacing the grease, turn the power off and pull
out the plug from the receptacle.
(1) Remove the crank cover and wipe off the old grease
inside. (Fig. 3)
(2) Supply 35 g (the standard volume to cover the
connecting rod) of Hitachi Electric Hammer Grease A
to the crank case.
(3) After replacing the grease, install the crank cover
securely.
NOTE
The Hitachi Electric Hammer Grease A is of the
low viscosity type. When the grease is consumed,
purchase from an
Center.

MAINTENANCE AND INSPECTION

CAUTION
Be sure to switch power OFF and disconnect the plug
from the receptacle to avoid serious trouble.
1. Inspecting the tool
Since use of a dull tool will degrade effi ciency and
cause possible motor malfunction, sharpen or replace
the tool as soon as abrasion is noted.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that
they are properly tightened. Should any of the screws
be loose, retighten them immediately. Failure to do so
could result in serious hazard.
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.
authorized Hitachi Service
4. Inspecting the carbon brushes (Fig. 4)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush can result in motor trouble, replace the carbon
brushes with new ones having the same carbon brush
No. shown in the fi gure 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.
5. Replacing carbon brushes
Loosen the set screw and remove the tail cover.
Remove the brush caps and carbon brushes. After
replacing the carbon brushes, do not forget to tighten
the brush caps securely and to install the tail cover.
6. 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.
NOTE
Due to HITACHI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.
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