Power
There are many kinds of forklifts that are operated by propane gas. Propane-powered forklifts are 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 the vapor mixes with air. The forklift throttle is used to be able to control the flow of vapor. A spark plug fires up the vapor and air mixture creating pressure that makes the pistons move. The pistons run the hydraulic pump and turn the wheels.

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

Hydraulics
The forklift's hydraulic system is what allows it to lift and transport really 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 build up of pressure 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 in the pump.

Steering
Propane forklifts work well where maneuverability is required. Unlike an automobile, a forklift uses its back wheels to pivot, which allows the forklift to turn quickly on a tight radius.