Hitachi H 90SC, Handling Instructions Manual

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English

(2) Swing the retainer back into place so that it engages

the accessory shank portion and prevents the
accessory, such as a bull point, a cutter, etc. from
coming all the way out of front cover. (

Fig. 2

)

5.

Always hold the body handle and side handle of this
Demolition Hammer firmly.

Otherwise the

counterforce produced may result in inaccurate and
even dangerous operation.

OPERATION

1. Pull the trigger switch after applying the tip of the bit

to the crushing position.

2. Operate this Demolition Hammer by utilizing its empty

weight. The performance will not be better even if it
is pressed or thrust forcibly against the work surface.
Hold this Demolition Hammer with a force just
sufficient to counteract the reaction.
This Demolition Hammer is equipped with a spring
cushion on the handle so that chipping vibration is
not conveyed to the operator.
Operate this Demolition Hammer without forcing the
handle too strongly.

CAUTION

Sometimes the power tool does not begin the striking
stroke even when the motor rotates because the oil
has become thick.
If the power tool is used at low temperatures or if it is
used after a long idle time, this Demolition Hammer
should be kept running in for about five minutes in
order to warm it up.

HOW TO REPLACE GREASE

This Demolition Hammer is of full air-tight construction
to protect against dust and to prevent lubricant leakage.
Therefore, this Demolition 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.

MAINTENANCE AND INSPECTION

CAUTION:

Be sure to swith OFF and disconnect the attachment
plug from the receptacle to avoid a serious accident.

1. Inspecting this Demolition Hammer

Since use of a dull accessory, such as a bull point, a
cutter, etc. will degrade efficiency and cause possible
motor malfunction, sharpen or replace with a new
one 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. Inspecting the retainer (Fig. 1, Fig. 2)

The retainer may become loose due to excessive
use. Always, pay attention to its proper functioning
to  securely hold the accessory shank portion. If any
wear and tear is found, bring this Demolition Hammer
to an authorized service center for maintenance
service.

4. 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.

5. Inspecting the carbon brushes (Fig. 3)

The motor employs carbon brushes which are
consumable parts. When they become worn to or
near “wear limit”, it results 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 

Fig.3

. In addition,

always keep carbon brushes clean and ensure that
they slide freely within the brush holders.

6. Replacement procedure

Loosen the screw (Hexagon socket hd. bolt M4 

×

 10)

of the cap cover, then remove the cap cover. 

(Fig. 4)

After removing the brush cap, the carbon brush can
be removed.
After replacing the carbon brush, tighten the brush
cap, then mount the cap cover securely.

7. Service parts list

A: Item No.
B: Code No.
C: No. Used
D: Remarks

CAUTION

Repair, modification and inspection of Hitachi Power
Tools must be carried out by an Authorized Service
Center.
This Parts List will be helpful if presented with the
power tool to the 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 modified to incorporate the latest technological
advancements.
Accordingly, some parts (i.e. code numbers and/or
design) may be changed without prior notice.

GUARANTEE

We guarantee Hitachi Power Tools in accordance with
statutory/country specific regulation. This guarantee does
not cover defects or damage due to misuse, abuse, or
normal wear and tear. In case of complaint, please send
the Power Tool, undismantled, with the GUARANTEE
CERTIFICATE found at the end of this Handling
instruction, to a Hitachi Authorized Service Center.

NOTE

Due to HITACHI’s continuing program of research and
development, the specifications herein are subject to
change without prior notice.

01Eng_H90SC_WE

08/12/10, 17:05

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