A forklift should be checked well and given a test run before purchasing it. This applies specifically to trucks being obtained on line. It is really essential to find possible issues with trucks purchased from companies on line.
Be sure to start the engine from cold, and note the ease with which the engine turns over and whether there is too much smoke. This is specifically crucial with IC engine trucks.
The test run must include an inspection of the truck's performance in challenging situations. A skilled operator can operate the truck in reverse and forward, up the ramp.
You could perform your own inspection of an IC engine truck. On a clear area of floor, run the truck around for a few minutes while a skilled operator tests the hydraulic functions. Afterward, look at the ground beneath for signs of fluid leakage. Even seemingly insignificant leaking could lead to serious problems that would be expensive to fix later on.
The chains and masts should be inspected by a skilled individual. 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 fork carriage and mast. Another is creeping down or creeping forward of the mast when loaded. These could be signs of problems with ram, valve or seals.
If the truck is not new, the mast may have been changed at some time. Make certain that the mast and any fitted attachments adhere to the rating plate on a truck. Check that the sideshift is not sticking when loaded.
Looking closely at the thickness of the heel for wear or damage should be included in the inspection. The manufacturer of the truck specifies minimum thickness. A loose fit can mean the hanger points or carriage are worn. Watch for cracks on the arms at heels and mountings.