Automatic load-holding devices engage and lock the lift structure as the PL6000DC raises, helping prevent sudden free fall in the unlikely event of suspension component failure. Once the platform reaches the desired height, operators can lower it onto the locks to minimize wear on suspension components and keep the lift securely supported. The PL6000DC also includes an electric key switch, automatic shut-off when the key is released, emergency stop button, upper limit switch, hydraulic overloading protection, pressure relief valve, pressure-compensated flow control valve, and mechanical safety locks spaced every 4 inches. That is the kind of control a parking lift needs when it is holding a vehicle above another one.