A forklift should be checked properly and given a test run before buying it. This applies especially to trucks being obtained on-line. It is very important to detect possible problems with trucks acquired from companies online.
Starting the engine from cold is a good idea. Note whether there is too much smoke and the ease with which the engine turns over. This is specifically essential with trucks that have IC engines.
The test run must include a check of the truck's performance in tough situations. A driver who is qualified could operate the truck in reverse and forward, up the ramp.
You could carry out your own inspection of an IC engine truck. On a clear part of floor, run the truck around for several minutes while a qualified operator tests the hydraulic functions. After that, examine the ground beneath for signs of fluid leakage. Even seemingly insignificant leaking could result in serious problems which will be very pricey to fix later on.
A qualified person must check the masts and chains. Check with and without a load that the mast works well. Watch for 'binding' or sticking of the mast. A warning indication is play in the mast channels or between the mast and fork carriage. One more is creeping down or creeping forward of the mast when loaded. These can be symptoms of problems with valve, seals or ram.
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. Check 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 can mean the carriage or hanger points are worn. Look for cracks on the arms at heels and mountings.