Manual Hitachi H90SC (page 6 of 32) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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(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, 17:055

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Hitachi H90SC Manual

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