A forklift should be inspected well and given a test run before buying it. This applies specifically to trucks being obtained on the World Wide Web. It is very important to detect potential issues with trucks obtained from businesses on-line.
Starting the engine from cold is a great idea. Note whether there is too much smoke and the ease with which the engine turns over. This is particularly essential with trucks which have IC engines.
Testing the performance of the truck in tough situations must be included in the test run. An operator who is qualified can operate the truck in forward and reverse, up the ramp.
You can inspect 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. Then, examine the ground beneath for signs of fluid leakage. Even seemingly insignificant leaking can lead to serious issues which would be costly to fix later on.
The masts and chains must be inspected by a skilled person. Check with and without a load that the mast works smoothly. Watch for sticking or 'binding' of the mast. A warning sign is play in the mast channels or between the fork carriage and mast. One more is creeping down or creeping forward of the mast when loaded. These could be symptoms of problems with ram, valve or seals.
The mast may have been changed at some time if the truck is not new. Make sure that the mast and any fitted attachments follow the rating plate on a truck. Check that the sideshift is not sticking when loaded.
When inspecting the forks, look closely at the heel thickness for wear or damage. The truck's manufacturer specifies minimum thickness. A loose fit might mean the hanger points or carriage are worn. Watch for cracks on the arms at mountings and heels.