Power
Numerous forklifts are designed to run on propane gas. Propane-powered forklifts are very easy to refill. The gas is stored in a pressurized tank on the truck's back. The propane is pushed into the engine, where it is converted into vapor and afterward the vapor mixes with air. The throttle of the forklift is used to control the vapor flow. A spark plug fires up the air and vapor mixture creating pressure which moves the pistons. The pistons run the hydraulic pump and turn the wheels.

Forklifts that use propane are suggested for use inside other buildings and warehouses since they are clean burning with low emissions.

Hydraulics
The forklift's hydraulic system is what enables it to raise and move very heavy objects from location to location. A pump, tubes and cylinders make up the hydraulic system. The pump forces dense fluid through the tubing and into the cylinders. The pressure build up pushes a piston, which lifts the forks. When the operator lowers the forks, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Propane forklifts work well where maneuverability is needed. Unlike an automobile, a forklift utilizes its back wheels to pivot, which enables the forklift to quickly pivot on a tight radius.