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Internal combustion engine, counterweight type forklifts typically weigh twice their rated capacity. A weight of 9800 pounds or more is very likely. The data plate(if present) should tell the weight. If you have the model and serial #, your local Nissan lift dealer should be able to find the information. 7,800 pounds is closer to the weight of a 3,000 or 4,000 pound capacity truck.
In this case, the preload length is 35mm and the resultant preload force is 17.5kg at zero travel. In other words, with this 0.5kg/mm spring and a setting at 35mm preload, you would have to put more than 17.5kg force on the end of the fork tube to create any movement at all.