A forklift must be checked well and given a test run before purchasing it. This applies especially to trucks being bought online. It is very essential to find potential problems with trucks purchased 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 specifically essential with trucks that have IC engines.
The test run should include a check of the truck's performance in tough situations. A qualified operator can maneuver 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 skilled driver tests the hydraulic functions. Then, examine the ground underneath for signs of fluid leakage. Even seemingly minor leaking could lead to serious problems which would be very pricey to fix later on.
The masts and chains must be checked by a qualified person. Check with and without a load that the mast operates smoothly. Watch for 'binding' or sticking of the mast. A warning indication is play in the mast channels or between the mast and fork carriage. Another is creeping down or creeping forward of the mast when loaded. These could be symptoms of problems with seals, ram or valve.
If the truck is used, the mast may have been changed at some time. Make certain that the mast and any fitted attachments follow the rating plate on a truck. Make certain 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 can mean the carriage or hanger points are worn. Watch for cracks on the arms at heels and mountings.