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How does a trolley jack work?

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Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. Lifting the handle of the trolley jack draws oil into the pump cylinder.
Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. Lowering the handle of the trolley jack pushes pressurised oil to the main cylinder. This causes the main piston to raise.
Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. After pumping the trolley jack several times, more pressurised oil will have entered the main cylinder.
Car and trolley jacks, axle stands, bottle jack, trolley jack, racing jack, vehicles, maintenance, mechanics, DIYers, wonkee donkee, hydraulic. As the pressurised oil lifts the main piston, it causes the arm and saddle to extend, lifting the vehicle.