Causes & Solutions for Overheating Gearboxes

1. Lubrication Failures (Most Common Cause)

• Improper oil level: Add oil to the marked scale if the level is too low; drain excess oil for overfilled gearboxes.
• Degraded lubricant: Replace black, turbid oil and thoroughly clean the oil tank.
• Mismatched oil viscosity: Use low-viscosity oil for high-speed light-load working conditions, high-viscosity oil for heavy loads, and fully synthetic oil for high-temperature environments.
• Loss of grease lubrication: Adopt anti-splash grease for high-speed operation; fill only 1/3 to 1/2 of the bearing cavity with grease.

2. Mechanical Faults

• Pitting or broken gear teeth: Replace damaged gears and conduct profile modification; ensure the gear contact area reaches more than 80%.
• Stuck or noisy bearings: Install new bearings and adjust preload force properly.
• Misaligned installation: Use a laser alignment instrument to limit axis deviation within 0.05mm per meter.
• Seal leakage: Replace skeleton oil seals to prevent dust and impurities from entering the box.

3. Inadequate Heat Dissipation

• Remove dust and dirt accumulated on the gearbox housing regularly.
• Equip auxiliary cooling devices such as exhaust fans or oil-water coolers.
• Select gearboxes with cooling fins on the casing; keep the unit away from external heat sources.

4. Abnormal Operating Load

• Monitor motor operating current continuously. Reduce load when overload occurs, or replace with a higher-torque gearbox.
• Install torque-limiting couplings to protect the transmission system from overload damage.

Emergency & Long-term Maintenance Suggestions

Emergency Treatment

Long-term Preventive Maintenance

1. Install temperature sensors to realize real-time overheating early warning.
2. Regularly test the acid value and water content of lubricating oil to predict potential faults in advance.