Power
There are numerous types of forklifts which are operated by propane gas. Propane-powered forklifts are simple to refill. The gas is stored inside a pressurized tank on the back of the truck. The propane is pushed into the engine, where it is converted into vapor and the vapor mixes with air. The forklift throttle is used to be able to control the flow of vapor. A spark plug fires up the mix of vapor and air creating pressure which moves the pistons. The pistons power the hydraulic pump and turn the wheels.
Propane powered forklifts are recommended for use in warehouses and other buildings since they are clean burning with low emissions.
Hydraulics
The hydraulic system of the forklift is what allows it to raise and move really heavy objects from place to place. Cylinders, a pump and tubes 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 an automobile, a forklift makes use of its rear wheels to pivot, that enables the forklift to turn quickly on a tight radius.