Power
There are many types of forklifts that are operated by propane gas. Forklifts which use propane are really easy 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 the vapor combines with air. The forklift throttle is utilized to control the flow of vapor. A spark plug ignites the mixture of vapor and air creating pressure that makes the pistons move. The pistons power the hydraulic pump and turn the wheels.

Because the types of forklifts which are operated by propane are clean burning and have low emissions, they are suitable to be used in warehouses and other buildings.

Hydraulics
The forklift's hydraulic system is what enables it to raise and move very heavy objects from place to place. Cylinders, a pump and tubes make up the hydraulic system. The pump forces dense fluid in the tubing and into the cylinders. The build up of pressure pushes a piston, which raises 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 needed. Unlike a car, a forklift makes use of its rear wheels to pivot, which allows the forklift to rapidly pivot on a tight radius.