Tools / Power Tools
HiKOKI G 12SA4(S) and G 13SB4(S) Disc Grinder User Guide
Quick guide for the HiKOKI G 12SA4(S) and G 13SB4(S) disc grinders, covering safety warnings, assembly, operation, maintenance, and technical specifications.
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This document provides essential safety and operational instructions for the HiKOKI G 12SA4(S) and G 13SB4(S) disc grinders. Always read the full manual before use to prevent electric shock, fire, or serious injury.
Safety Warnings
General Power Tool Safety: Keep the work area clean and well-lit. Do not operate in explosive atmospheres. Keep children and bystanders away. Ensure the power switch is in the OFF position before connecting to a power source.
Grinding and Cutting Safety: This tool is intended for grinding or cutting. Sanding, wire brushing, or polishing are not recommended. Always use the correct guard for the selected wheel. Ensure the rated speed of the accessory is at least equal to the maximum speed of the tool. Wear personal protective equipment, including eye and ear protection, dust mask, and gloves.
Mounting and Operation
- Wheel Guard: Must be securely attached and positioned for maximum safety.
- Side Handle: Fix securely to the tool.
- Wheel Assembly: Ensure the depressed center wheel is the correct type, free of cracks, and properly mounted with the wheel nut securely tightened.
- Switch Operation: Ensure the push button is disengaged before switching the tool on. The tool features 0-voltage restart protection; if power is cut, return the switch to OFF and wait at least 1 second before restarting.
Maintenance and Inspection
- Depressed Center Wheel: Regularly inspect for cracks and surface defects.
- Mounting Screws: Regularly inspect and ensure they are properly tightened.
- Carbon Brushes: Inspection and replacement must ONLY be performed by a HiKOKI Authorized Service Center.
- Motor Maintenance: Regularly blow dry air through the tail cover air hole while the motor is running without load to remove accumulated dust and dirt.
Technical Specifications
Refer to the table on page 120 for detailed specifications. The tool features 0-voltage restart protection to prevent accidental startup after power interruptions.
Manufacturer information
HiKOKI
Practical help
Common problems
Tool does not start after power interruption
The 0-voltage restart protection is active. Return the switch to OFF and wait at least 1 second before restarting.
Considerable vibration during operation
Stop the tool immediately, check the wheel mounting, and inspect for defects or damage.
Motor malfunctions
Accumulated dust and dirt inside the motor may be the cause. Blow out the motor with dry air while running without load.
Before use
- Ensure the power source matches the nameplate requirements.
- Check that the power switch is in the OFF position.
- Inspect the grinding wheel for cracks or surface defects.
- Ensure the wheel is properly mounted and the nut is tightened.
- Confirm the push button is disengaged.
- Wear appropriate personal protective equipment (eye/ear protection, dust mask).
Specs in practice
- 0 Voltage Re-start Protection
- Prevents the tool from restarting automatically after a power cut.
- Class II tool
- Double-insulated construction, does not require an earthed plug.
Images and diagrams
- Fig 1: Fitting and adjusting the wheel guard.
- Fig 2: Fixing the side handle.
- Fig 3: Assembling the depressed center wheel.
- Fig 4: Assembling the cutting wheel and wheel guard.
- Fig 7: Correct grinding angle and method.
Model compatibility
- Use only wheel types recommended for the tool.
- Do not use reducing bushings or adapters for large-hole wheels.
- For threaded-hole wheels, ensure the thread is long enough to accept the spindle length.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.