Regarding the oil leakage problem of the NGW122-8 reducer, if you want to deal with it quickly, you first need to clarify the specific location and cause of the oil leakage. The following are several quick troubleshooting and processing methods summarized for you:
1. Check and clean the vent cap (respirator)
When the reducer is running, the temperature rises and the internal pressure increases. If the breather cap (small nostril) is blocked by dust or sludge, the internal high pressure will force the lubricating oil out of the gap and cause oil leakage.
Quick treatment of the breather cap: Unscrew the breather cap and check whether the small hole is unobstructed. You can use thin wire to clear it or clean it with compressed air. If the aging is serious, it is recommended to replace it directly.
2. Check and adjust oil level
If the amount of refueling is too much, the oil pool will be violently stirred when the reducer is running, and the lubricating oil will splash everywhere and accumulate on the shaft seal, joint surface, etc., causing leakage.
Quick oil level treatment: Observe the oil dipstick scale. If the oil level is too high, drain off the excess lubricating oil to keep the oil level within the normal scale range.
3. Check seals (oil seals) and bearings
Oil seal problems: aging, hardening and cracking of the sealing ring, loss of elasticity or improper installation (such as lip damage, reverse installation) are common causes of oil leakage.
Quick treatment: Use your fingers to press the lip of the old oil seal. If it has lost elasticity or cracked, replace it with a new high-quality oil seal. When assembling, be sure to apply lubricating oil to the lip and ensure that there are no burrs on the shaft end.
Bearing problem: If the output shaft bearing is worn and the gap becomes larger, the output shaft will produce radial runout (wobble), which will accelerate the eccentric wear of the oil seal and lead to oil leakage.
Quick treatment: Shake the output shaft by hand. If there is obvious gap and shaking feeling, new bearings must be replaced in pairs.
4. Check the box joint surface and bolts
Oil leakage from the sight hole cover, oil drain hole or box joint surface is usually caused by loose fixing bolts, failure to install sealing gaskets, or iron filings or deformation on the joint surface, resulting in loose fit.
Quick treatment of the box joint surface and bolts: Check and tighten the bolts in the oil leakage area. For leaks at static sealing points (such as joint surfaces), polymer composites, oil surface emergency repair agents or sealants can be used for on-site plugging repairs. This method does not require disassembly, saves time and effort, and is highly effective.
5. Make sure the oil return tank is clear (smooth flow design)
If there is no oil return groove or the oil return hole is blocked on the box, the lubricating oil thrown by the gear to the bearing and shaft seal cannot flow back to the oil pool, and will leak outward under the action of pressure difference.
Quick treatment of oil return tank: clean the blocked oil return hole. If conditions permit, an oil return groove inclined toward the inside of the machine can be opened in the center of the lower tile of the bearing seat, and a notch can be opened at the straight opening of the end cover to face the oil return groove to guide excess oil back to the oil pool.
Summary suggestions:
If you encounter oil leakage, do not blindly replace the oil seal. It is recommended to follow the order of "Clean the breather cap -> Check the oil level -> Shake and test the bearing -> Check the oil seal and joint surface". If the problem still cannot be solved after self-examination, or if it involves complex internal structural damage, it is recommended to contact professional maintenance personnel in time for processing.
