Power
Many forklifts are made to run on propane gas. Forklifts which use propane are really easy to refill. The gas is stored inside a pressurized tank on the truck's rear. The propane is pushed into the engine, where it is converted into vapor and the vapor mixes with air. The throttle of the forklift is utilized to control the flow of vapor. A spark plug fires up the mixture of air and vapor producing pressure that moves the pistons. The pistons turn the wheels and run the hydraulic pump.

Forklifts that use propane are suggested for use inside warehouses and other buildings since they are clean burning with low emissions.

Hydraulics
The forklift's hydraulic system is what enables it to lift and move very heavy stuff 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 pressure build up pushes a piston, which lifts 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 necessary. Not like an automobile, a forklift makes use of its back wheels to turn, that enables the forklift to turn fast on a tight radius.