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USE OF JACK: A jack is a mechanical device used as a lifting device to lift heavy loads or to apply great forces. ,What makes a jack work is simple leverage. Hydraulic jacks tend to be stronger and can lift heavier loads higher .A Hydraulic trolley Jack resembles a trolley in Shaped, having a cylindrical body and a neck, from which the hydraulic ram emerges .In a trolley jack the piston is vertical and directly supports a bearing pad that contacts the object being lifted .Function:1.Lifts vehicles so that maintenance can be performed.2. Typical uses include the repair of automobiles and house foundations.3. This type of jack is best used for short vertical lifts.4. trolley Jacks provided an easy way for an individual to lift up a vehicle for roadside inspection or service.5. Their ability to lift heavy loads plays a big role in enabling the repair of large agricultural machinery and in many construction operationsIt Is Compatible With TUV300