The FUJI Advantage: 70 Years of Unmatched Expertise
FUJI GRINDING WHEEL MFG CO., LTD. holds a highly unique and prestigious position in the industrial sector. With a rich history spanning over 70 years, we are the only manufacturer in Japan that produces both professional power tools and high-quality grinding wheels. This dual expertise allows us to engineer products with perfect synergy.
Our FUJI KOSOKU high-frequency power tools are strictly durable industrial grinding equipment. Engineered with advanced brushless squirrel-cage induction motors, they are built for maximum loading capacity. They deliver unmatched stability, reliability, and sustained torque in the most grueling manufacturing environments.
1. Warranty Period & Coverage Scope
FUJI provides a standard 1-year (12 months) warranty for 300Hz high-frequency power tools, effective from the date of original purchase by the end-user.
Strict Limitation of Coverage: This warranty strictly and exclusively covers defects in materials and manufacturing workmanship. If a tool fails under normal and proper operating conditions due to a structural flaw or an assembly defect from our factory, FUJI will repair or replace the defective component free of charge.
The Reality of Heavy-Duty Grinding: Once these tools are deployed into foundry and fabrication environments, they are subjected to extreme, heavy-duty grinding. Due to uncontrollable external factors—such as severe airborne metal dust, varying operator habits, highly variable voltage conditions, and continuous heavy load operations—a tool can experience failure at any time if pushed beyond its physical limits. Therefore, the warranty absolutely does not cover tool failures caused by operational wear and tear, overloading, or harsh environmental exposure.
2. Warranty Exclusions & Operational Prohibitions
The following conditions are explicitly excluded from warranty coverage. Claims arising from these scenarios will be voided:
- Normal Wear and Tear: Expected degradation of consumable and moving parts (e.g., switches, cables, bearings, housings, gears) resulting from regular high-intensity operation.
- Improper Use & Overloading: Motor burnouts or mechanical damage caused by continuous motor overloading, pressing the tool too hard against dense materials, or applying physical pressure beyond the tool's rated capacity.
- Misuse of Consumables: It is strictly prohibited to use grinding wheels for cutting workpieces. This causes severe abnormal lateral stress, leading to immediate gear failure and motor burnout.
- Incorrect Power Supply: Failures resulting from connecting the tool to incorrect voltages or improper current types.
- Environmental Neglect: Short circuits or mechanical seizing caused by the accumulation of conductive metallic dust, oil, or water residue inside the motor due to a lack of regular cleaning.
- Unauthorized Modification: Tools that have been disassembled, modified, or repaired by unauthorized personnel.
3. Crucial Maintenance & Usage Guidelines
To maximize the service life and stability of your FUJI equipment, the following maintenance protocols must be strictly adhered to.
⚠ SAFETY WARNING: Always turn off the power to the grinder and disconnect it from the generator or inverter before performing any inspection, maintenance, or parts replacement.
- 1. Inspecting the Grinding Wheel: Monitor abrasive wear closely. For example, the wear limit outside diameter for the HGC-3902 model is approximately 115mm. Replace the wheel once it reaches this limit to ensure safety and efficiency.
- 2. Inspecting Mounting Screws: Regularly inspect all mounting screws and housing bolts to ensure they are properly tightened. Vibrations from heavy grinding can cause loosening. If any screw is loose, tighten it immediately. Failure to do so could result in a serious hazard or catastrophic tool failure.
- 3. Gear Grease Exchange: The gear mechanism utilizes grease as a lubricant. Grease exchange must be performed on a regular basis (every 4 to 5 months depending on usage intensity). When replacing, completely clean and remove the old grease from the gear and angle head before refilling with our company-designated industrial grease.
- 4. Maintenance of the Motor: Exercise extreme care not to scratch the motor windings during maintenance. Ensure that oil and water absolutely do not penetrate the motor housing. The accumulation of dirt and conductive dust inside the motor will inevitably cause a malfunction.
- 5. Regular Air Duct Cleaning: After approximately 50 hours of use, allow the motor to run at a no-load operation. During this time, use moisture-free, clean compressed air to blow thoroughly from the rear air holes of the motor to clear out internal dust accumulation.
- 6. Working Hours: We recommend limiting continuous working time to a maximum of 8 hours per day. Alternating between multiple machines is highly recommended to prevent overheating.
