Power
Many forklifts are designed to operate on propane gas. Propane-powered forklifts are 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 then the vapor combines with air. The throttle of the forklift is utilized to be able to control the flow of vapor. A spark plug ignites the air and vapor mixture producing pressure that moves the pistons. The pistons power the hydraulic pump and turn the wheels.

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

Hydraulics
The forklift's hydraulic system is what allows it to lift and move very heavy objects from place to place. 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, that raises 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 necessary. Not like an automobile, a forklift utilizes its back wheels to pivot, that enables the forklift to pivot quickly on a tight radius.