In the routine or corrective maintenance of rotating systems, a fast, reliable and non-destructive approach need to beadopted. Use of hammerand drift pins to removebearings, gears, pulleys and other components stuck in shafts can damage the shaft or the component.Furthermore, such method of removing stuck components can be unsafe and is a form of occupational hazard. While occupational hazards have been a concern for long , harmful habits have reportedly led to injuries and other work related health issues in the automobile industry . A puller,also called an extractor, can sufficiently be used to safely remove components stuck in a shaft.Development of puller for removal of components from shaft started almost a century ago .
There are two types of pullers namely;the hydraulic and the mechanical types.The hydraulic pullers work base on hydraulic principle. They are easier and quicker to use, also they are suitably used when very largeextraction forces are required.Hydraulic pullersare complicated and ostly to acquire by local technologyin developing countries.
The mechanical puller is a simple device in that it has few and easy to construct components, namely; the screw, a bolt/head, linkage arm (jaw) and a handle. The jaws are either two or three. Currently, there exist different jaw designs .The mechanical pullers work base on the principle of power screw,that is, they change angular motion into linear motion totransmit power.
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