G12SA3 - Grinder HITACHI - Free user manual and instructions
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| Product type | Grinder (mill) |
| Brand | HITACHI |
| Model | G12SA3 |
| Category | Mill |
| Supply voltage | 120 V AC/DC |
| Frequency | 60 Hz |
| Rated current | 8.0 A |
| No-load speed | 10,000 rpm |
| Wheel diameter | 115 mm (4-1/2 in) |
| Wheel bore | 22 mm (7/8 in) |
| Weight | 1.9 kg (4.2 lb) |
| Motor type | Single-phase series commutator motor |
| Double insulation | Yes |
| Protective guard | Adjustable wheel guard |
| Switch | Sliding ON/OFF |
| Push button | Shaft lock |
| Main uses | Grinding of metals, resins, slates, bricks, marble |
| Included accessories | Depressed center wheel, wrench, side handle |
| Periodic maintenance | Replacement of carbon brushes, inspection of screws and wheel |
| Reparability | Repair only by authorized Hitachi center |
| Cleaning | Soft cloth with soapy water, avoid solvents |
| Protection class | Class II (double insulation) |
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USER MANUAL G12SA3 HITACHI
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Line drawing of a G12SA3 power tool with visible blade and central hub (no text or symbols on the diagram itself)SAFETY INSTRUCTIONS AND INSTRUCTION MANUAL
WARNING
IMPROPER OR UNSAFE use of this power tool can result in death or serious bodily injury!
This manual contains important information about product safety. Please read and understand this manual BEFORE operating the power tool. Please keep this manual available for other users and owners before they use the power tool.
This manual should be stored in safe place.
INSTRUCTIONS DE SECURITE ET MODE D'EMPLOI
⚠ AVERTISSEMENT
IMPORTANT SAFETY INFORMATION .... 3
MEANINGS OF SIGNAL WORDS 3
SAFETY 4
GENERAL SAFETY RULES 4
SPECIFIC SAFETY RULES AND SYMBOLS 6
IMPORTANT SAFETY INFORMATION
Read and understand all of the safety precautions, warnings and operating instructions in the Instruction Manual before operating or maintaining this power tool.
Most accidents that result from power tool operation and maintenance are caused by the failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing a potentially hazardous situation before it occurs, and by observing appropriate safety procedures.
Basic safety precautions are outlined in the “SAFETY” section of this Instruction Manual and in the sections which contain the operation and maintenance instructions.
Hazards that must be avoided to prevent bodily injury or machine damage are identified by WARNINGS on the power tool and in this Instruction Manual.
NEVER use this power tool in a manner that has not been specifically recommended by HITACHI.
MEANINGS OF SIGNAL WORDS
WARNING indicates a potentially hazardous situations which, if ignored, could result in death or serious injury.
CAUTION indicates a potentially hazardous situations which, if not avoided, may result in minor or moderate injury, or may cause machine damage.
NOTE emphasizes essential information.
SAFETY
GENERAL SAFETY RULES
⚠ WARNING: Read and understand all instructions.
Failure to follow all instructions listed below, may result in electric shock, fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
1. Work Area
(1) Keep your work area clean and well lit. Cluttered benches and dark areas invite accidents.
(2) Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Power tools create sparks which may ignite the dust of fumes.
(3) Keep bystanders, children, and visitors away while operating a power tool. Distractions can cause you to lose control.
2. Electrical Safety
(1) Double Insulated tools are equipped with a polarized plug (one blade is wider than the other.) This plug will fit in a polarized outlet only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician to install a polarized outlet. Do not change the plug in any way. Double Insulation ☐ eliminates the need for the three wire grounded power cord and grounded power supply system.
(2) Avoid body contact with grounded surfaces such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is grounded.
(3) Don't expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
(4) Do not abuse the cord. Never use the cord to carry the tools or pull the plug from a receptacle. Keep cord away from heat, oil, sharp edges or moving parts. Replace damaged cords immediately. Damaged cords increase the risk of electric shock.
(5) When operating a power tool outside, use an outdoor extension cord marked "W-A" or "W". These cords are rated for outdoor use and reduce the risk of electric shock.
3. Personal Safety
(1) Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use tool while tired or under the influence of drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.
(2) Dress properly. Do not wear loose clothing or jewelry. Contain long hair. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewelry, or long hair can be caught in moving parts.
(3) Avoid accidental starting. Be sure switch is off before plugging in. Carrying tools with your finger on the switch or plugging in tools that have the switch on invites accidents.
(4) Remove adjusting keys or wrenches before turning the tool on. A wrench or a key that is left attached to a rotating part of the tool may result in personal injury.
(5) Do not overreach. Keep proper footing and balance at all times. Proper footing and balance enables better control of the tool in unexpected situations.
(6) Use safety equipment. Always wear eye protection. Dust mask, non-skid safety shoes, hard hat, or hearing protection must be used for appropriate conditions.
4. Tool Use and Care
(1) Use clamps or other practical way to secure and support the workpiece to a stable platform. Holding the work by hand or against your body is unstable and may lead to loss of control.
(2) Do not force tool. Use the correct tool for your application. The correct tool will do the job better and safer at the rate for which it is designed.
(3) Do not use tool if switch does not turn it on or off. Any tool that cannot be controlled with the switch is dangerous and must be repaired.
(4) Disconnect the plug form the power source before making any adjustments, changing accessories, or storing the tool. Such preventive safety measures reduce the risk of starting the tool accidentally.
(5) Store idle tools out of reach of children and other untrained persons. Tools are dangerous in the hands of untrained users.
(6) Maintain tools with care. Keep cutting tools sharp and clean. Properly maintained tools, with sharp cutting edges are less likely to bind and are easier to control.
(7) Check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect the tool's operation. If damaged, have the tool serviced before using. Many accidents are caused by poorly maintained tools.
(8) Use only accessories that are recommended by the manufacturer for your model. Accessories that may be suitable for one tool, may become hazardous when used with another tool.
5. Service
(1) Tool service must be performed only by qualified repair personnel. Service or maintenance performed by unqualified personnel could result in a risk of injury.
(2) When servicing a tool, use only identical replacement parts. Follow instructions in the Maintenance section of this manual. Use of unauthorized parts or failure to follow Maintenance Instruction may create a risk of electric shock or injury.
SPECIFIC SAFETY RULES AND SYMBOLS
- ALWAYS use proper guard with grinding wheel. A guard protects operator from broken wheel fragments.
- Accessories must be rated for at least the speed recommended on the tool warning label. Wheels and other accessories running over rated speed can fly apart and cause injury.
- Hold tools by insulated gripping surfaces when performing an operation where the cutting tool may contact hidden wiring or its own cord. Contact with a "live" wire will make exposed metal parts of the tool "live" and shock the operator.
- ALWAYS wear ear protectors when using the tool for extended periods.
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Abstract black-and-white icon of a human head silhouette with a thermometer inside, no text or symbols present.Prolonged exposure to high intensity noise can cause hearing loss.
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Use only a depressed center wheel with a rated capacity which is GREATER than 13,300 RPM for G12SA3 and 12,000 RPM for G13SB3. Using any wheel a rated capacity LESS than 13,300 RPM and/or an incorrect sized wheel (see SPECIFICATIONS at page 10) may result in wheel breakage, flying wheel fragments, and resulting in death or serious injury.
-
NEVER touch moving parts.
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Symbolic icon showing a hand crushing a circular object with a question mark, representing environmental or security hazard (no text present)NEVER place your hands, fingers or other body parts near the tool's moving parts.
- NEVER operate without all guards in place.
NEVER operate this tool without all guards or safety features in place and in proper working order. If maintenance or servicing requires the removal of a guard or safety feature, be sure to replace the guard or safety feature before resuming operation of the tool.
- Use right tool.
Don't force small tool or attachment to do the job of a heavy-duty tool.
Don't use tool for purpose not intended —for example— don't use circular saw for cutting tree limbs or logs.
- NEVER use a power tool for applications other than those specified.
NEVER use a power tool for applications other than those specified in the Instruction Manual.
10. Handle tool correctly.
Operate the tool according to the instructions provided herein. Do not drop or throw the tool. NEVER allow the tool to be operated by children, individuals unfamiliar with its operation or unauthorized personnel.
11. Keep all screws, bolts and covers tightly in place.
Keep all screws, bolts, and plates tightly mounted. Check their condition periodically.
12. Do not use power tools if the plastic housing or handle is cracked.
Cracks in the tool's housing or handle can lead to electric shock. Such tools should not be used until repaired.
13. Blades and accessories must be securely mounted to the tool.
Prevent potential injuries to yourself or others. Blades, cutting implements and accessories which have been mounted to the tool should be secure and tight.
14. Keep motor air vent clean.
The tool's motor air vent must be kept clean so that air can freely flow at all times. Check for dust build-up frequently.
15. Operate power tools at the rated voltage.
Operate the power tool at voltages specified on its nameplate.
If using the power tool at a higher voltage than the rated voltage, it will result in abnormally fast motor revolution and may damage the unit and the motor may burn out.
16. NEVER use a tool which is defective or operating abnormally.
If the tool appears to be operating unusually, making strange noises, or otherwise appears defective, stop using it immediately and arrange for repairs by a Hitachi authorized service center.
17. NEVER leave tool running unattended. Turn power off.
Don't leave tool until it comes to a complete stop.
18. Carefully handle power tools.
Should a power tool be dropped or struck against hard materials inadvertently, it may be deformed, cracked, or damaged.
19. Do not wipe plastic parts with solvent.
Solvents such as gasoline, thinner benzine, carbon tetrachloride, and alcohol may damage and crack plastic parts. Do not wipe them with such solvents.
Wipe plastic parts with a soft cloth lightly dampened with soapy water and dry thoroughly.
20. NEVER use a depressed center wheel which is cracked or deformed or worn away (see the MAINTENANCE AND INSPECTION section on page 15).
21. NEVER use the grinder in places where the sparks generated by the grinder can cause explosion, such as where flammable materials or gases are present.
22. NEVER push in the push button while the spindle is running.
23. ALWAYS wear eye protection that meets the requirement of the latest revision of ANSI Standard Z87.1.
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Silhouette of a helmet with a visor icon and arrow pointing to the head (no text or symbols)- ALWAYS wear a mank or respirator to protect yourself from dust or potentially harmful particles generated during the grinding operation.
- ALWAYS firmly grip the body handle and side handle while operating the grinder.
- ALWAYS have a trial run before grinding commence. (see Test the grinder before using on page 12).
- ALWAYS follow the instructions contained in this manual when replacing the depressed center wheel.
- ALWAYS be careful with buried object such as an underground wiring.
Touching these active wiring or electric cable with this tool, you may receive an electric shock.
Comfirm if there are any buried object such as electric cable within the wall, floor or ceiling where you are going to operate here after.
- Definitions for symbols used on this tool
V ...... volts
Hz ...... hertz
A...... amperes
No ..... no load speed
W...... w att
☐...... Class II Construction
---/min ..... revolutions per minute
To ensure safer operation of this power tool, HITACHI has adopted a double insulation design. “Double insulation” means that two physically separated insulation systems have been used to insulate the electrically conductive materials connected to the power supply from the outer frame handled by the operator. Therefore, either the symbol “☐” or the words and “Double insulation” appear on the power tool or on the nameplate.
Although this system has no external grounding, you must still follow the normal electrical safety precautions given in this Instruction Manual, including not using the power tool in wet environments.
To keep the double insulation system effective, follow these precautions:
○Only HITACHI AUTHORIZED SERVICE CENTER should disassemble or assemble this power tool, and only genuine HITACHI replacement parts should be installed.
○Clean the exterior of the power tool only with a soft cloth moistened with soapy water, and dry thoroughly.
Never use solvents, gasoline or thinners on plastic components; otherwise the plastic may dissolve.
SAVE THESE INSTRUCTIONS AND
MAKE THEM AVAILABLE TO OTHER USERS AND OWNERS OF THIS TOOL!
FUNCTIONAL DESCRIPTION
NOTE:
The information contained in this Instruction Manual is designed to assist you in the safe operation and maintenance of the power tool.
NEVER operate, or attempt any maintenance on the tool unless you have first read and understood all safety instructions contained in this manual.
Some illustrations in this Instruction Manual may show details or attachments that differ from those on your own power tool.
NAME OF PARTS
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Push Button Switch Gear Cover Housing Tail Cover Depressed Center Wheel Side Handle Packing Gland Wheel GuardFig.1
SPECIFICATIONS
| Model G12SA3 G13SB3 | ||
| Motor Single-Phase Series Commutator Motor | ||
| Power Source Single-Phase 120 V AC 60 Hz / DC | ||
| Current 8.0 A | ||
| No-Load Speed 10,000/min | ||
| Wheel Size:external diam. 4-1/2" (115 mm) 5" (125 mm)hole diam. 7/8" (22 mm) 7/8" (22 mm) | ||
| Weight 4.2 lbs (1.9 kg) | ||
ASSEMBLY AND OPERATION
APPLICATIONS
○Removal of casting fin and finishing of various type of steel, bronze and aluminum materials and castings.
○Grinding of welded sections or sections cut by means of an acetylene torch.
○Grinding of synthetic resins, slate, brick, marble.
WARNING: To avoid the risk of serious injury, NEVER use this grinder with cup wheels and/or saw blades.
PRIOR TO OPERATION
- Power source
Ensure that the power source to be utilized conforms to the power source requirements specified on the product nameplate.
- Power switch
Ensure that the switch is in the OFF position. If the plug is connected to a receptacle while the switch is in the ON position, the power tool will start operating immediately and can cause serious injury.
- Extension cord
When the work area is far away from the power source, use an extension cord of sufficient thickness and rated capacity. The extension cord should be kept as short as practicable.
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WARNING:
Damaged cord must be replaced or repaired.
- Check the receptacle
If the receptacle only loosely accepts the plug, the receptacle must be repaired. Contact a licensed electrician to make appropriate repairs.
If such a faultly receptacle is used, it may cause overheating, resulting in a serious hazard.
- Check your work environment
Ensure the following before operation:
○No flammable gas, liquid, or object at worksite.
○When grinding thin steel sheet it may cause a high booming noise.
To avoid such noise, place a rubber mat under the workpiece.
○Clear the area of children or unauthorized personnel.
6. Mounting the wheel guard
Be sure to mount the wheel guard at an angle that will protect the operator's body from injury by a broken wheel piece.
[Installing Wheel Guard]
○Slightly loosen the screw on the wheel guard.
○Install the wheel-guard-locating pin in line with the across flats of the packing gland, turn it to the angle suitable for operation, and make adjustment.
○After the adjustment, ensure that the screw is securely tightened on the wheel guard in order to fix it completely.
WARNING:
If the wheel guard is not attached properly, a broken wheel may result in and cause death or serious injury.
- Thoroughly check that the depressed center wheel is free of cracks, splits and other abnormalities before mounting. Make sure it is firmly clamped and has been properly mounted. Refer to page 14 of this manual for Depressed Center Wheel Assembly and Disassembly
- Test the grinder before using.
Before actually beginning the grinding work, test the grinder by first clearing the area of all other personnel. Make sure the wheel guard is in place and that you are wearing eye protection. Turn the grinder “on”, and make sure the grinder runs smoothly and shows no abnormalities.
Duration of the trial run is as follows:
When depressed center wheel is replaced.... 3 minutes or more
When starting daily work .... 1 minute or more
- Use only properly rated depressed center wheels.
Use only depressed center wheels rated at 13,300 RPM for G12SA3 and 12,000 RPM for G13SB3 or more.
Using a depressed center wheel rated less can lead to wheel disintegration during operation and cause serious bodily injury.
- Check the push button.
Make sure that the push button is disengaged by pushing push button two or three times before turning on the grinder. (Fig. 5)
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Locating Pin Wheel Guard Across Flats Packing GlandFig. 2
GRINDER OPERATION
- Hold the grinder firmly by its housing and side handle (Fig. 1).
The grinder produces a counterforce which must be controlled by firmly holding onto the grinder.
- Turn the grinder "on". (Fig. 3)
While holding the grinder firmly, use one finger to slide the switch to the "on" position.
- Use light grinding pressure.
There is no need to press hard when grinding. Usually the grinder's own weight is sufficient to allow the required light contact with the surface to be ground.
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ON OFF SwitchFig. 3
WARNING: Do not press the grinder forcibly against the surface to be ground. Heavy pressure can result in wheel breakage and serious injury. It can also damage the surface being ground or damage the grinder's motor.
- Use proper grinding angle.
Grind only with the wheel's edge by lifting the grinder 15^ to 30^ , as shown in Fig. 4.
CAUTION: Do not use the entire surface of the depressed center wheel. Use only the edge of the depressed center wheel.
- Move the grinder in the proper direction.
When using a new depressed center wheel in direction A (Fig. 4), the wheel edge may cut into the workpiece. In this case, grind in direction B (Fig. 4).
Once the wheel edge is worn, the workpiece can be ground in both directions.
NOTE: The wheel provided (resinoid wheel) is rated as Class A grain and # 36 grain size. It is most suitable for heavy grinding of steel and other types of materials.
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15°~30° A BFig. 4
- Adjust operation to desired finish.
For a fine finish, decrease pressure by lifting slightly. Grind slowly and at the appropriate speed.
CAUTION: The revolving depressed center wheel will create air turbulence. Do no lay the grinder down in areas of dust or dirt until it has come to a complete stop.
DEPRESSED CENTER WHEEL ASSEMBLY AND DISASSEMBLY
WARNING: Never attempt to assemble or disassemble the depressed center wheel, unless the power switch is in the "OFF" position and the electrical cord has been disconnected from the receptacle.
1. Assembly
(1) Turn the disc grinder upsidedown so that the spindle is facing upward.
(2) Align the oval-shaped indentation of the wheel washer with the notched part of the spindle, then attach them.
(3) Fit the protuberance of the depressed center wheel onto the wheel washer.
(4) Screw the wheel nut onto the spindle.
(5) While pushing the push button with one hand, lock the spindle by turning the depressed center wheel slowly with the other hand.
Tighten the wheel nut by using the supplied wrench as shown in Fig. 5.
⚠️ CAUTION: Tighten the wheel nut securely and confirm that the depressed center wheel does not wobble.
2. Disassembly
To remove the depressed center wheel, simply reverse the above-mentioned procedure.
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Wrench Wheel Nut Depressed Center Wheel Wheel Washer Spindle Wheel Guard Push Button TightenFig. 5
MAINTENANCE AND INSPECTION
WARNING:
-
Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance and inspection.
●Using cracked, deformed or damaged wheels can lead to wheel breakage and resulting serious injury. -
Replacing the depressed center wheel
Replace the depressed center wheel when it has been worn out to about 2-3/8" (60mm) in external diameter. Confirm that there is no crack or any damage to the depressed center wheel. If there is a crack or a transformation in the wheel, replace it immediately.
- Inspecting the screws
Regularly inspect all screws and ensure that they are fully tightened. Should any of the screws be loosened, retighten them immediately.
WARNING: Using this grinder with loosened screws is extremely dangerous.
- Confirm that there is no damage in the wheel guard, the electrical cord and the housing, etc.
Check that the on/off switch operates normally.
- Inspecting the carbon brushes (Fig. 6)
The motor employs carbon brushes which are consumable parts. Replace the carbon brush with a new one when it becomes worn to its wear limit. Always keep carbon brushes clean and ensure that they slide freely within the brush holders.
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Wear limit No. of carbon brush 88 0.24" (6mm) 0.67" (17mm)Fig. 6
CAUTION: Using this grinder with a carbon brush which is worn in excess of the wear limit will damage the motor.
NOTE: Use HITACHI carbon brush No. 88 indicated in Fig. 6.
○Replacing carbon brushes:
(1) Loosen the D4 tapping screw retaining the tail cover and remove the tail cover.
(2) Use the auxiliary hexagonal wrench or small screwdriver to pull up the edge of the spring that is holding down the carbon brush. Remove the edge of the spring toward the outside of the brush holder.
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Carbon Brush Brush Holder SpringFig. 7
(3) Remove the end of the pig-tail on the carbon brush from the terminal section of brush holder and then remove the carbon brush from the brush holder.
(1) Insert the end of the pig-tail of the carbon brush in the terminal section of brush holder.
(2) Insert the carbon brush in the brush holder.
(3) Use the auxiliary hexagonal wrench or small screwdriver to return the edge of the spring to the head of the carbon brush.
(4) Mount the tail cover and tighten the D4 tapping screw.
- Service and repairs
All quality power tools will eventually require servicing or replacement of parts because of wear from normal use. To assure that only authorized replacement parts will be used, all service and repairs must be performed by a HITACHI AUTHORIZED SERVICE CENTER, ONLY.
- Service parts list
CAUTION: Repair, modification and inspection of Hitachi Power Tools must be carried out by an 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 modified to incorporate the latest technological advancements.
Accordingly, some parts (i.e. code numbers and/or design) may be changed without prior notice.
ACCESSORIES
WARNING:
Never use any accessories other than those mentioned below.
The use of any accessories other than those mentioned below or attachments not intended for use such as cup wheel, cut-off wheel or saw blade is dangerous and may cause personal injury or property damage.
NOTE:
Accessories are subject to change without any obligation on the part of the HITACHI.
STANDARD ACCESSORIES
○ Depressed center wheel....1
4-1/2" (115 mm) external dia. · 1/4" (6 mm) thickness · 7/8" (22 mm) hole dia.
(Code No. 701045) G12SA3
5" (125 mm) external dia. · 1/4" (6 mm) thickness · 7/8" (22 mm) hole dia.
(Code No. 701050) G13SB3
○ Wrench (Code No. 938332Z)....1
○ Side Handle (Code No. 994322)....1
NOTE:
Specifications are subject to change without any obligation on the part of the HITACHI.
INFORMATIONS IMPORTANTES DE SÉCURITÉ
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Black and white illustration of a hand with a lightning bolt symbol, no text or labels present.⚠ AVERTISSEMENT:
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Technical line drawing of a mechanical assembly with no visible text or symbolsBalai en Support Ressort carbone de balai
Fig. 7
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Symbolic icon showing a hand crushing a circular button with a question mark, representing food waste or collision (no text present)natural_image
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Black and white illustration of a hand with a lightning bolt symbol (no text or numbers)
ADVERTENCIA:
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ON OFF InterruptorFig. 3
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Exploded view diagram of a mechanical assembly with numbered parts and exploded views for assembly or maintenance.G13SB3
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Exploded view diagram of a mechanical assembly with numbered parts and component labels
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Line drawing of a quill pen with inkwell (no text or symbols)
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Line drawing of a quill pen in an inkwell (no text or symbols)WARNING:
Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:
- Lead from lead-based paints,
●Crystalline silica from bricks and cement and other masonry products, and
●Arsenic and chromium from chemically-treated lumber.
Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in a well ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic particles.
AVERTISSEMENT:
Sinagawa Intercity Tower A, 15-1, Konan 2-chome, Minato-ku, Tokyo 108-6020, Japan
Distributed by
Hitachi Koki U.S.A., Ltd.
3950 Steve Reynolds Blvd.
Norcross, GA 30093
Hitachi Koki Canada Co.
6395 Kestrel Road
Mississauga ON L5T 1Z5
