Power
There are many types of forklifts that are operated by propane gas. Forklifts which utilize propane are simple to refill. The gas is stored in a pressurized tank on the back of the truck. The propane is pushed into the engine, where it is converted into vapor and afterward the vapor mixes with air. The forklift throttle is used to control the vapor flow. A spark plug fires up the air and vapor mixture creating pressure that moves the pistons. The pistons turn the wheels and power the hydraulic pump.
Since the kinds of forklifts that are operated by propane have low emissions and are clean burning, they are suitable to be used in other buildings and warehouses.
Hydraulics
What allows a forklift to raise and move heavy things from one location to another is the hydraulic system. A pump, tubes and cylinders make up the hydraulic system. The pump forces dense fluid in the tubing and into the cylinders. The pressure build up pushes a piston, that raises the forks. When the operator lowers the forks, 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 back wheels to turn, that allows the forklift to quickly turn on a tight radius.