Power
There are many kinds of forklifts that are operated by propane gas. Forklifts that use propane are really 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 utilized to be able to control the vapor flow. A spark plug fires up the air and vapor mixture creating pressure that moves the pistons. The pistons turn the wheels and run the hydraulic pump.

Propane powered forklifts are recommended 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 very heavy objects from place to place. Cylinders, a pump and tubes 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, which raises the forks. When the forks are lowered by the operator, the hydraulic fluid flows out of the cylinders and back into the pump.

Steering
Propane forklifts work well where maneuverability is needed. Not like a car, a forklift uses its back wheels to pivot, which allows the forklift to rapidly pivot on a tight radius.