How to Handle Industrial Robot Joint Oil Leakage? Sealing, Lubrication, and Reducer Condition Inspection
Oil leakage from robot joints does not necessarily indicate reducer damage. It should be comprehensively assessed by combining the leak point, lubrication state, operating temperature, abnormal noise, and backlash, and sealing repairs and operational verification should be completed according to manufacturer requirements.
01. First, Confirm the Source of the Oil Stain
When oil stains are found near the joints of ABB, FANUC, KUKA, or YASKAWA robots, the robot should be stopped, and measures for power-off, energy dissipation, and mechanical fall prevention should be implemented. After cleaning the contaminated area, observe the path of new oil stains to differentiate between reducer seal leakage, loose filling port, oil separation from body grease, and contamination from external process media. Avoid replacing the reducer based solely on appearance.
02. Inspect Seals and Installation Areas
Focus on checking the output end, input end, end cover mating surfaces, and areas around plugs. Aging seal lips, shaft surface wear, assembly misalignment, or abnormal impact on the joint can all cause continuous leakage. Before disassembly and inspection, record the robot posture, leak point, and operating hours. Confirm the lubricant material, filling method, and disassembly/assembly requirements according to the original manufacturer's manual. Do not mix unknown greases.
03. Assess Internal Mechanical Condition
Jog each axis at low speed, listen for periodic abnormal noises, and observe vibration, temperature rise, and positioning changes. If increased backlash, load alarms, metal particles, or significant discoloration of grease occur simultaneously, further inspection of bearings, gears, and reducer wear is required. Simply replenishing lubricant cannot eliminate seal damage, and overfilling may increase internal pressure.
04. Post-Repair Verification
After replacing seals or treating mating surfaces, check fastening, cable routing, and joint range of motion. Then perform staged testing under low-speed no-load, normal trajectory, and rated process conditions. Confirm there is no new leakage, abnormal temperature rise, or noise, and recheck zero point, TCP, and repeat positioning performance.
05. Establish Maintenance Records
Robot maintenance should record photos of leak points, lubrication status, corrective actions, and re-inspection dates to provide trend data for subsequent industrial robot repair. In cases of frequent recurrence, external factors such as collisions, overload, ambient temperature, and installation posture should be investigated.
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