Probable causes of coupling problems are a loose key or an unbalanced, misaligned, loose or wrongly lubricated coupling. ![]() There are numerous causes if the problem is the belt drive: the sheave is not tight on the shaft the belts are hitting the belt tube belts are too loose or too tight belts have the wrong cross section belts are not matched in length on multi-belt drives variable pitch sheaves are not adjusted so each groove has the same pitch diameter the sheaves are misaligned or the belts are worn the motor anchoring, base or fan is not secure improper drive selection loose key or oily and dirty belts. If the impeller is hitting the cut-off, the cut-off is not secure in the housing, it’s improperly positioned, or it’s damaged. When an impeller hits the inlet or housing, it’s likely not centred the inlet or housing is damaged the impeller is crooked or damaged there’s a loose shaft or loose bearing a shaft is bent or there’s a misaligned shaft and bearing. detailed five malfunctions and their symptoms during a workshop for maintenance pros in Hamilton.ġ. Engineering manager Marcel Kamutzki from fan and blower manufacturer Daltec Canadian Buffalo Manufacturing Ltd. To fix failures it’s useful to know what causes them. ![]() ![]() PHOTO: ThinkstockĬentrifugal fans and fan systems used in industrial HVAC applications can fail in many ways.
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