Power
There are many types of forklifts which are powered by propane gas. Propane-powered forklifts are easy to refill. The gas is stored inside a pressurized tank on the rear of the truck. The propane is pushed into the engine, where it is converted into vapor and afterward the vapor mixes with air. The throttle of the forklift is utilized to control the flow of vapor. A spark plug fires up the vapor and air mixture producing pressure that makes the pistons move. The pistons turn the wheels and power the hydraulic pump.
As the types of forklifts that are operated by propane have low emissions and are clean burning, they are best to be used inside other buildings and warehouses.
Hydraulics
What allows a forklift to lift and transport heavy stuff from one place to another is the hydraulic system. A pump, tubes and cylinders 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 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 necessary. Not like a car, a forklift makes use of its back wheels to turn, which allows the forklift to turn quickly on a tight radius.