Hitachi H 70SD, Handling Instructions Manual

5

English

Standard Hex. Shank Bit (Combo Type)

Retaining Groove Bit without Collar

䡬

Mounting air tool shank and standard hexagonal
shank tools.
(1) Clean, then smear the accessory shank portion

grease or machine oil.

(2) Move the retainer to open position 

A

 and seat

the accessory, such as a bull point, a cutter, etc.,
in the hexagonal hole in the front cover (See

Fig.1

).

(3) Clamp the accessory into place by bringing the

retainer to the clamp position. To make sure that
the accessory is properly mounted, pull on the
accessory. (

Fig. 2

)

䡬

Mounting standard hexagonal shanks and retaining
groove shanks without collars.
(1) Clean, then smear the accessory shank portion

with grease or machine oil.

(2) Move the retainer to position 

A

. Align the

accessory shank portion so that its recessed
portion is under clamp and seat the accessory,
such as a bull point, a cutter, etc., in the hexagonal
hole in the front cover (See 

Fig. 3

).

(3) Clamp the accessory into place by bringing the

retainer to clamp position 

B

. To make sure that

the accessory is properly mounted, pull on the
accessory. (

Fig. 4

)

NOTE:

When removing the accessory, such as a bull point,
a cutter, etc., carry out the above procedures in
reverse.

HOW TO USE THE DEMOLITION HAMMER

1. Squeeze the trigger switch after applying the tip of

the bit to the crushing position.
In some cases, it is necessary to punch the tip of the
bit against the crushing position forcibly in order to
begin the striking motion.
This is not due to malfunction of the power tool. It
means that the safe guard mechanism against no-
load striking is working.

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. (

Fig.

5

)

GREASE REPLACEMENT

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. 6)

The Motor employs carbon brushes which are
consumable parts. When they become worn to or
near the “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 Numbers shown in the 

Fig. 6

. In

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

6. Replacing carbon brushes:

Loosen the screws (Hexagon socket hd. bolt M4

×

12)

of the cap covers, then remove the cap covers (

Fig.

7

). After removing the brush caps, the carbon brushes

can be removed.
After replacing the carbon brushes, tighten the brush
caps, then mount the cap covers 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.