A forklift should be checked well and given a test run before buying it. This applies particularly to trucks being purchased on the Web. It is really vital to find potential issues with trucks bought from businesses 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 vital with trucks which have IC engines.
The test run should include an inspection of the truck's performance in tough situations. A skilled driver can drive the truck in forward and reverse, up the ramp.
You could perform 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 indications of fluid leakage. Even seemingly minor leaking could indicate serious issues that would be pricey to fix later on.
A qualified individual should 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 sign is play in the mast channels or between the mast and fork carriage. Another is creeping forward or creeping down of the mast when loaded. These can be symptoms of problems with valve, seals or ram.
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 sure that the sideshift is not sticking when loaded.
When inspecting the forks, look closely at the heel thickness for wear or damage. The manufacturer of the truck specifies minimum thickness. A loose fit can mean the carriage or hanger points are worn. Look for cracks on the arms at mountings and heels.