Power
There are many types of forklifts that are operated by 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 afterward the vapor combines with air. The forklift throttle is used to control the flow of vapor. A spark plug fires up the mix of air and vapor creating pressure that moves the pistons. The pistons turn the wheels and run the hydraulic pump.

Forklifts that use propane are recommended for use within warehouses and other buildings because they are clean burning with low emissions.

Hydraulics
The forklift's hydraulic system is what enables it to raise and move really heavy things from place to place. 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 forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Where maneuverability is required, propane forklifts are the most suitable. Unlike a car, a forklift utilizes its back wheels to turn, which allows the forklift to pivot quickly on a tight radius.