Power
Many forklifts are designed to run on propane gas. Propane-powered forklifts are very simple to refill. The gas is stored in a pressurized tank on the truck's rear. The propane is pushed into the engine, where it is converted into vapor and then the vapor mixes with air. The forklift throttle is utilized to control the flow of vapor. A spark plug ignites the mixture of air and vapor producing pressure that makes the pistons move. The pistons turn the wheels and run the hydraulic pump.
Propane powered forklifts are recommended for use in other buildings and warehouses because they are clean burning with low emissions.
Hydraulics
The hydraulic system of the forklift is what enables it to raise and transport really heavy things from location to location. A pump, tubes and cylinders make up the hydraulic system. The pump forces dense fluid in the tubing and into the cylinders. The build up of pressure pushes a piston, which lifts the forks. When the forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back in the pump.
Steering
Propane forklifts work well where maneuverability is necessary. Unlike a car, a forklift makes use of its rear wheels to pivot, that enables the forklift to turn fast on a tight radius.