Power
There are many kinds of forklifts which are operated by propane gas. Forklifts which utilize propane are really easy to refill. The gas is stored inside a pressurized tank on the truck's back. The propane is pushed into the engine, where it is converted into vapor and then the vapor combines with air. The forklift throttle is used to control the flow of vapor. A spark plug ignites the air and vapor mixture creating pressure that makes the pistons move. The pistons run the hydraulic pump and turn the wheels.
Because the kinds of forklifts which are operated by propane have low emissions and are clean burning, they are best to be utilized within other buildings and warehouses.
Hydraulics
The hydraulic system of the forklift is what enables it to lift and transport very heavy things from location to location. Cylinders, a pump and tubes make up the hydraulic system. The pump forces dense fluid through 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 uses its rear wheels to pivot, which allows the forklift to pivot fast on a tight radius.