To determine whether the seal of the PWU200 worm gear reducer is in good condition, the core is through the combination of 'visual observation + operation monitoring + targeted detection', focusing on checking for oil leakage, air intake/water intake, and impurity intrusion. The specific methods are as follows:
1. Static visual inspection (stop state)
Check the key sealing parts: focus on the output shaft oil seal, the box joint surface, the oil filler/oil drain plug, and the periphery of the breather valve. Wipe it with a clean paper towel and observe. If there is no oil stain or oil residue, it is initially qualified.
Check the appearance of the seal: When disassembling the end cap or screw plug, check that the oil seal lip is not cracked or deformed, that the sealing gasket is not aged, hardened, or damaged, and that the sealant on the joint surface is not peeled off or cracked.
Test the ventilation function: Press the ventilation valve to exhaust smoothly and rebound the seal after letting go. No oil spills from the ventilation valve to avoid excessive internal pressure from damaging the seal due to poor ventilation.
2. Operating status monitoring (no load + load)
No-load operation test: Start the reducer and run it for 30 minutes without load. Check the above-mentioned sealing parts immediately after stopping. There are no new oil stains or oil droplets, and there are no traces of leakage on the ground.
Load operation verification: load to 80%-100% of the rated load and run for 1-2 hours. During this period, observe every 30 minutes. There is no oil leakage from the sealing part, no trace of oil mist evaporation, and no obvious oil film adhering to the surface of the shell.
Temperature-related check: The shell temperature is normal (≤90°C) during operation. If the temperature rises abnormally and is accompanied by oil leakage from the sealing part, the oil level may be too high or the seal may fail due to heat.
3. Targeted special inspection (when seal failure is suspected)
Oil level change monitoring: record the initial oil level, and recheck after 1 week of normal operation. The oil level does not drop significantly (the drop does not exceed 10% of the oil level scale), and hidden oil leakage is ruled out.
Impurity intrusion inspection: Disassemble the oil release screw plug and observe that the released lubricating oil is free of moisture, dust, metal debris and other impurities to avoid the entry of external contaminants due to loose sealing.
Pressure test (optional): Pour low-pressure compressed air (pressure ≤ 0.05MPa) into the sealed box, and apply soapy water to the sealing part. If no bubbles are generated, the seal is intact.
