Seeking assistance with the inspection and alignment of the reducer for the fan in a circulating water cooling tower
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This post was last edited by Guobao17 on 2022-10-7 at 21:02. Our company has many cooling tower fans, and it is necessary to check the operation of the reducers; these reducers are of the Shanghai Erhuajie MSRL350D type. Due to a lack of experience, I would like to know that during routine inspections, after draining the oil and removing the observation hole on the side of the reducer, in addition to checking whether the gears are damaged, what other aspects need to be inspected and what should be taken into consideration? Also, how should one align devices with long drive shafts? Could you provide the alignment steps? Please ask an expert for help; thank you
When asking such questions, it’s best to take a video of the actual setup; what matters most is the installation style, whether it’s horizontal or vertical. Typically, for this type of reducer used in cooling towers, it should be thoroughly rinsed inside with cleaning oil before use, and then flushed several times with diluted oil before being put into operation. Because there are mechanical impurities inside at the time of manufacture. Also, within a week of first use, discard all the thin oil. It is best to open the oil seal at the bottom for cleaning. Most problems occur at this stage; the presence of mechanical impurities causes the oil seal to be damaged and oil to leak, which ultimately leads to damage to the bearings. As for disassembly, it mainly involves fixing the track gear of the planetary gear transmission to the housing, which is done using pins. For reference.
Without a laser alignment tool, connect the couplings and install dial indicators at both ends; fix the indicator bases on the motor and the reducer, then make adjustments based on the values shown by the indicators
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In other words, both the motor and the reducer need to have their positions adjusted simultaneously
It’s basically impossible to see the internal gears; one can only check the condition of the oil when changing it. For alignment, a laser aligner is needed; the deviation measured with a gauge is quite large.
We also use fan reducers with this type of structure; it’s just that the brand is different. The coupling has protrusions, which helps ensure good alignment. If alignment is needed, one can use a level to check the extended shaft. The coupling is equipped with elastic rubber sleeves, so the alignment requirements aren’t too strict. As a last resort, the outer edge of the rubber sleeve can be filed down slightly – this is something we discovered through practical maintenance experience. I hope this will be useful to you.
Align both ends of the long axis and perform multiple calibrations. The fan operates at low speed for extended periods; pay attention to the quality and quantity of oil, the accuracy of blade installation, and regular checks for corrosion of internal fasteners.
If the operating data is normal, regular oil changes are sufficient; if vibration increases, the input shaft bearings should be checked. For routine inspections, it’s advisable to check the angle of the fan blades as well as the tightness of the bolts securing them.
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