A forklift must be checked correctly and given a test run prior to purchasing it. This applies specifically to trucks being acquired online. It is important to find possible problems with trucks acquired from businesses online.
Starting the engine from cold is a great idea. Note whether there is excessive smoke and the ease with which the engine turns over. This is specifically essential with IC engine trucks.
Testing the performance of the truck in tough situations must be included in the test run. A qualified driver could operate the truck in forward and reverse, up the ramp.
You could check an IC engine truck yourself. On a clear area of floor, run the truck around for several minutes while a trained driver tests the hydraulic functions. Afterward, examine the ground underneath for indications of fluid leakage. Even seemingly minor leaking could lead to serious issues that will be expensive to fix later on.
The masts and chains must be checked by a skilled individual. Check with and without a load that the mast works 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. Another is creeping forward or creeping down of the mast when loaded. These could be symptoms of problems with ram, valve or seals.
If the truck is not new, the mast might have been changed at some time. Make sure that the mast and any fitted attachments adhere to the rating plate on a truck. Make certain that the sideshift is not sticking when loaded.
Looking closely at the thickness of the heel for wear or damage must be included in the inspection. The truck's manufacturer specifies minimum thickness. A loose fit can mean the carriage or hanger points are worn. Watch for cracks on the arms at heels and mountings.