Power
There are numerous kinds of forklifts that are powered by propane gas. Forklifts that use propane are really simple to refill. The gas is stored in a pressurized tank on the rear of the truck. The propane is pushed into the engine, where it is converted into vapor and then the vapor combines with air. The forklift throttle 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 turn the wheels and power the hydraulic pump.

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

Hydraulics
The forklift's hydraulic system is what enables it to lift and transport really heavy things from location to location. A pump, tubes and cylinders 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 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 required. Not like a car, a forklift makes use of its back wheels to turn, that allows the forklift to rapidly pivot on a tight radius.