Grease Replacement; Maintenance And Inspection - Hitachi H 41SC Handling Instructions Manual

2. Power switch
Ensure that the power switch is in the OFF position. If
the plug is connected to a receptacle while the power
switch is in the ON position, the power tool will start
operating immediately, which could cause a serious
accident.
3. Extension cord
When the work area is removed from the power source,
use an extension cord of suffi cient thickness and rated
capacity. The extension cord should be kept as short as
practicable.
4. Installing tools
CAUTION
Be sure to switch power OFF and disconnect the plug
from the receptacle to avoid serious trouble.
NOTE
Concerning the tools such as bull points and cutters,
be sure to use separately sold genuine parts that are
designated by HITACHI.
(1) Wipe off and clean up the shank section of the tool, and
apply grease or machine oil onto it.
(2) Insert the shank section of the tool completely into the
hexagonal hole of the front cover at a state where the
slide grip is fully pulled in the direction of Ⓐ as shown in
Fig. 1
(3) Return the slide grip to its home position and make sure
that the tool is pulled and locked securely.
(4) Removal is carried out at a state where the slide grip is
fully pulled in the direction of Ⓐ in a manner similar to
the case of installing the tool.
CAUTION
Be sure to grip the handle and cylinder case cover
portion during work. Do not hold by the slide grip during
work: lf you pull it by mistake, the bull point could jump
out.
HOW TO USE THE DEMOLITION HAMMER (Fig. 2)
1. After placing the tip of the tool in the base hole, 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 grase 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 30 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 authorized Hitachi Service 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.
4. Inspecting the carbon brushes (Fig. 4)
The Motor employs carbon brushes which are
consumable parts. When they become worn to or near
the "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 Numbers shown in the fi gure. 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
A : Item No.
B : Code No.
C : No. Used
D : Remarks
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 (i.e. code numbers and/or
design) 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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