There are numerous types of forklifts that are operated by propane gas. Propane-powered forklifts 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 the vapor mixes with air. The forklift throttle is utilized to control the flow of vapor. A spark plug fires up the air and vapor mixture creating pressure that moves the pistons. The pistons turn the wheels and run the hydraulic pump.
Since the types of forklifts which are operated by propane have low emissions and are clean burning, they are best to be utilized within warehouses and other buildings.
The forklift's hydraulic system is what enables it to lift and transport very heavy stuff from location to location. Tubes, cylinders and a pump 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 lifts the forks. When the operator lowers the forks, the hydraulic fluid flows out of the cylinders and back into the pump.
Propane forklifts work well where maneuverability is needed. Unlike a car, a forklift makes use of its back wheels to pivot, that enables the forklift to pivot fast on a tight radius.