Demolition Hammer Model H 90SB

Demolition Hammer
Model H 90SB
Handling instructions
Note:
Before using this HITACHI Demolition Hammer, carefully read
through these HANDLING INSTRUCTIONS to ensure efficient, safe
operation. It is recommended that these HANDLING
INSTRUCTIONS be kept readily available as an important reference
when using this power tool.
Double insulation
We sincerely thank you for selecting a HITACHI POWER TOOL. To operate this power tool
safely and efficiently, please read this INSTRUCTION MANUAL carefully to get a good
understanding of the precautions in operation, capacity of the power tool, use and the like.
GENERAL OPERATONAL PRECAUTIONS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
1
KEEP WORK AREA CLEAN. Cluttered areas and benches invite injuries.
CONSIDER WORK AREA ENVIRONMENT.
Don’t expose power tools to rain.
Don’t use power tools in damp or wet locations.
Keep work area well lit.
Don’t use the power tool in presence of flammable liquids or gases.
Power tools produce sparks during operation. They also spark when switching ON/
OFF. Never use power tools in dangerous sites containing lacquer, paint, benzine,
thinner, gasoline, gases, adhesive agents, and other materials which are combustible
or explosive.
GUARD AGAINST ELECTRIC SHOCK. Prevent body contact with grounded surfaces.
For example: pipes, radiators, ranges refrigerator enclosures.
KEEP VISITORS OR CHILDREN AWAY. Do not let visitors or children contact the power
tool or extension cord. All visitors or children should be kept away from work area.
STORE IDLE POWER TOOLS. When not in use, power tools should be stored in dry,
and high or locked-up place-out of reach of children.
DON’T FORCE THE POWER TOOL. It will do the job better and safer at the rate for
which it was intended.
USE RIGHT POWER TOOLS. Don’t force a small power tool or attachment to do the job
of a heavy-duty tool. Don’t use the power tool for purpose not intended - for example don’t use circular saw for cutting tree limbs or logs.
DRESS PROPERLY. Do not wear loose clothes or accessories. They can be caught in
moving parts.
Rubber gloves and non-skid footwear are recommended when working outdoors.
Wear protective hair covering to contain long hair.
USE SAFETY GLASSES. All persons in the area where power tools are being operated
should also wear safety eye protectors, and face or dust masks if cutting operation is
dusty.
DON’T ABUSE CORD. Never carry power tools by cord or yank the cord to disconnect
the power tool from receptacle. Keep the cord from heat, oil and sharp edges.
DON’T OVERREACH. Keep proper footing and balance at all times.
MAINTAIN POWER TOOLS WITH CARE. Keep power tools sharp and clean for better
and safer performance.
Follow instructions for lubricating and changing accessories.
Inspect tool cords periodically and if damaged, have repaired by the authorized service
center.
Inspect extension cords periodically and replace them if damaged.
Keep handles dry, clean, and free from oil and grease.
DISCONNECT POWER TOOLS. When not in use, before servicing, and when changing
accessories, such as blades, bits, cutters.
REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of checking to see that keys
and adjusting wrenches are removed from the power tool before turning it on.
15. AVOID UNINTENTIONAL STARTING. Don’t carry a plugged-in the power tool with finger
on switch. Be sure switch is off when plugging in.
16. OUTDOOR USE EXTENSION CORDS. When the power tool is used outdoors, use only
extension cords intended for use outdoors and so marked.
17. STAY ALERT. Watch what you are doing. Use common sense. Do not operate the power
tool when you are tired.
18. CHECK DAMAGED PARTS. Before use of the power tool, a guard or other part should
be carefully checked to determine that it will operate properly and perform its intended
function. Check the alignment of moving parts, binding of moving parts, breakage of
parts, mounting, and any other conditions that may affect its operation. A guard or
other part that is damaged should be properly repaired or replaced by an authorized
service center unless otherwise indicated elsewhere in this instruction manual.
Have defective switches replaced by an authorized service center.
Do not use the power tool if switch does not turn it on and off.
19. Do not use the power tool for applications other than those specified in the Handling
Instructions.
20. To ensure the designed operational integrity of the power tool, do not remove installed
covers or screws.
21. Do not touch movable parts or accessories unless the power source has been
disconnected.
22. Use your power tool at lower input than specified on the nameplate; otherwise, the
finish may be spoiled and working efficiency reduced due to motor overload.
23. DO NOT WIPE PLASTIC PARTS WITH SOLVENT. Solvent such as gasolin, thinner,
benzine, carbon tetrachloride, alcohol, ammonia and oil containing chloric annex
damage and crack plastic parts. Do not wipe them with such solvents. Wipe plastic
parts with a soft cloth lightly dampened with soapy water.
24. Consult an authorized service center in the event of the power tool failure.
25. Use only original HITACHI replacement parts.
26. This power tool should only be disassembled for replacement of carbon brushes.
SERVICE AND REPAIRS
All quality tools will eventually require servicing or replacement of parts due to wear from
normal use. These operations should ONLY be performed by an authorized service center.
DOUBLE INSULATION SYSTEM ENHANCES SAFE OPERATION
To enhance safe operation of this electric power tool, HITACHI has adopted a double
insulation system. The term “double insulation” used here denotes an insulation system
with two insulations physically separated and arranged between the electrically conductive
material connected to the power supply and the outer frame subject to contact by the
operator.
Thus, the power tool is termed double insulated and both the “ ”
mark and “Double insulation”, or either one is indicated on the name
plate.
While no external grounding is required with this system, normal safety
DOUBLE INSULATION
precautions as outlined in this manual must still be followed.
2
To maintain the effectiveness of the double insulation system, follow the precautions
described below:
1. Always contact your dealer or an authorized service center when assembling,
disassembling or replacing parts other than accessories or carbon brushes. Improper
assembly and/or replacement with wrong parts may result in eliminating the double
insulation-feature.
2. Clean the exterior of the power tool with a soft cloth moistened with soapy water, and
dry thoroughly. Chloric solvent, gasoline, and thinner will cause plastic components to
dissolve.
REPLACEMENT PARTS
When servicing use only identical replacement parts.
PARTICULAR PRECAUTIONS ON USING DEMOLITION HAMMER
In addition to the precautions mentioned above, following particular precautions for this
Demolition Hammer should be followed.
1. Wear earplugs to protect your ears during operation.
2. Do not touch the bit during or immediately after operation. The bit becomes very hot
during operation and could cause serious burns.
3. Before starting to break, chip or drill into a wall, floor or ceiling, thoroughly confirm
that such items as electric cables or conduits are not buried inside.
NAME OF PARTS
Handle
Switch trigger
Tail cover
Hexagon socket
hd. bolt (M5 x 10)
Front cover
Housing cover
Housing
Retainer
Side handle
Name plate
Bolt, Spring lock washer
(M8 x 30)
Fig. 1
NOTE:
Install the side handle with the supplied 4 bolts and 4 spring lock washers. Tighten the
bolts securely with the supplied wrench.
3
SPECIFICATIONS
Motor
: Single-phase, series commutator motor
Power source
: Single-phase 50/60 Hz
Input
: 1450W*
Full-load impact rate : 850/min
Weight
: 32 kg (without cord)
*Be sure to check the nameplate on this Demolition Hammer as it is subject to change by
areas.
STANDARD ACCESSORIES
1. Hexagon Bar Wrench 10 mm (for M12) ............................................................................. 1
2. Hexagon Bar Wrench 6 mm (for M8) ................................................................................. 1
3. Hexagon Bar Wrench 4 mm (for M5) ................................................................................. 1
4. Side Handle .......................................................................................................................... 1
5. Bolt ........................................................................................................................................ 4
6. Spring Lock Washer ............................................................................................................ 4
Standard accessories are subject to change without notice.
OPTIONAL ACCESSORIES (sold separately)
1.
Bull point
Overall length: 520 mm
2.
Cold chisel
Overall length: 520 mm
3.
Scoop
Overall length: 533 mm
4.
Cutter
Overall length: 520 mm
Width: 75 mm
Optional accessories are subject to change without notice.
APPLICATION
This demolition hammer should be applied to breaking concrete, chipping off concrete,
grooving, bar cutting, and driving piles in installation of piping and wiring, sanitary facility
installation, machinery installation, water supply and drainage work, interior jobs, harbor
facilities and other civil engineering work, etc.
PRIOR TO OPERATION
1.
Power source
Ensure that the power source to be utilized conforms to the power requirements specified
on the name plate of this Demolition Hammer.
4
2.
Power switch
Ensure that the power switch is in the OFF position. If the plug is connected to a power
receptacle while the power switch is in the ON position, this Demolition hammer will
start operating immediately, inviting serious accident.
3. Extension cord
When the work area is remote from the power source, use an extension cord of sufficient
thickness and rated capacity. The extension cord should be kept as short as practicable.
4. Mounting an accessory, such as a bull point, a cutter, etc..
(1) With the retainer directed backward, insert the accessory shank portion into the
hole on the front cover. (Fig. 2)
(2) Swing the retainer back into place so that it engages the accessory shank portion
and prevents accessories from coming out of front cover. (Fig. 3)
NOTE:
Use a manual hammer to open/close the retainer as it is too heavy to move by hand.
Fig. 2
Fig. 3
NOTE:
When removing the accessory, such as a bull point, a cutter etc., follow the above procedure
in reverse order.
OPERATION
1.
2.
Pull 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 stroke.
This is not due to malfunction of the power tool. It means that the safe guard mechanism
against no-load striking is working.
Operate this Demolition Hammer by utilizing its own 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.
CAUTION:
Sometimes the power tool does not begin the striking stroke even when the motor rotates
because 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 for about five minutes in order to warm it up.
HOW TO REPLACE GREASE
This Demolition Hammer is 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.
5
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
1.
2.
3.
4.
5.
Inspecting this Demolition Hammer
Use of a dull accessory, such as a bull point, a cutter, etc., will cause motor
malfunctioning and efficiency degraded. Replace with a new one without delay when
abrasion is noted.
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.
Inspecting the retainer (Fig. 2 and 3)
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.
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.
Inspecting the carbon brushes (Fig. 4)
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. 4.
In addition, always keep carbon brushes clean and ensure that they slide freely within
the brush holders.
Wear limit
No. of Carbon
Brush
No. of
carbon brush
a
Usual carbon brush
44
6
Auto-stop carbon
brush
74
7
Fig. 4
6.
Replacement procedure
Loose the screw (Hexagon socket hd. bolt M5 x 10) of the tail cover, then remove the
tail cover. (Fig. 1) After removing the brush cap, the carbon brush can be removed.
After replacing the carbon brush, tighten the brush cap, then mount the tail cover
securely.
NOTE:
Due to HITACHI’s continuing program of research and development, the specifications herein
are subject to change without prior notice.
6