A forklift must be inspected well and given a test run prior to purchasing it. This applies particularly to trucks being purchased on the Internet. It is really important to find potential issues with trucks acquired from businesses on the Internet.
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 which have IC engines.
Testing the performance of the truck in challenging situations must be included in the test run. An operator who is qualified could maneuver the truck in forward and reverse, up the ramp.
You can inspect an IC engine truck yourself. On a clear part of floor, run the truck around for a few minutes while a qualified driver tests the hydraulic functions. After that, examine the ground beneath for signs of fluid leakage. Even seemingly insignificant leaking could lead to serious problems which would be really pricey to fix later on.
The masts and chains should be inspected by a skilled individual. Check with and without a load that the mast operates well. Watch for sticking or 'binding' of the mast. A warning sign is play in the mast channels or between the fork carriage and mast. Another is creeping forward or creeping down of the mast when loaded. These can be signs of issues with ram, valve or seals.
If the truck is not new, the mast might have been changed at some time. Make certain that the mast and any fitted attachments adhere to 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 wear or damage. The manufacturer of the truck specifies minimum thickness. A loose fit might mean the carriage or hanger points are worn. Look for cracks on the arms at mountings and heels.