A forklift must be inspected well and given a test run before purchasing it. This applies specifically to trucks being purchased online. It is very essential to detect potential problems with trucks bought 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 especially essential with trucks which have IC engines.
The test run must include an inspection of the truck's performance in tough situations. An operator who is qualified can operate the truck in reverse and forward, up the ramp.
You can check an IC engine truck yourself. On a clear area of floor, run the truck around for a few minutes while a trained driver tests the hydraulic functions. Then, look at the ground underneath for signs of fluid leakage. Even seemingly minor leaking can indicate serious issues that would be pricey to fix later on.
A skilled individual should check the masts and chains. Check with and without a load that the mast operates well. Watch for 'binding' or sticking 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 can be signs of issues with ram, valve or seals.
The mast might 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. Make sure 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. Look for cracks on the arms at heels and mountings.