A forklift must be checked correctly and given a test run prior to purchasing it. This applies specifically to trucks being acquired on-line. It is really important to find possible problems with trucks bought from companies on-line.
Be sure to start the engine from cold, and note the ease with which the engine turns over and whether there is excessive smoke. This is especially crucial with IC engine trucks.
The test run must include an inspection of the truck's performance in challenging situations. A trained driver can drive the truck in forward and reverse, up the ramp.
You can perform your own inspection of an IC engine truck. On a clear area of floor, run the truck around for several minutes while a skilled driver tests the hydraulic functions. Then, look at the ground underneath for indications of fluid leakage. Even seemingly minor leaking could result in serious issues that would be costly to fix later on.
A qualified individual should inspect the masts and chains. Check with and without a load that the mast operates well. 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 down or creeping forward of the mast when loaded. These could be signs of issues with valve, seals or ram.
The mast may have been changed at some time if the truck is not new. Make sure that the mast and any fitted attachments adhere to the rating plate on a truck. Check 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 could mean the carriage or hanger points are worn. Look for cracks on the arms at mountings and heels.