A forklift must be inspected correctly and given a test run prior to purchasing it. This applies particularly to trucks being bought on line. It is very important to detect potential issues with trucks purchased from companies on line.
Be certain to start the engine from cold, and note the ease with which the engine turns over and whether there is excessive smoke. This is specifically essential with IC engine trucks.
The test run must include a check of the truck's performance in tough situations. A skilled driver could drive the truck in reverse and forward, up the ramp.
You can check an IC engine truck yourself. On a clear part of floor, run the truck around for a few minutes while a skilled operator tests the hydraulic functions. Afterward, look at the ground underneath for signs of fluid leakage. Even seemingly insignificant leaking could lead to serious issues which would be expensive to repair later on.
A skilled individual should check the chains and masts. Check with and without a load that the mast operates smoothly. Watch for sticking or 'binding' of the mast. A warning indication is play in the mast channels or between the mast and fork carriage. One more is creeping forward or creeping down of the mast when loaded. These can be symptoms of issues with valve, seals or ram.
If the truck is used, the mast might have been changed at some time. Make certain that the mast and any fitted attachments follow the rating plate on a truck. Make certain that the sideshift is not sticking when loaded.
When checking the forks, look closely at the heel thickness for damage or wear. The truck's manufacturer specifies minimum thickness. A loose fit might mean the carriage or hanger points are worn. Watch for cracks on the arms at heels and mountings.