chuck:
ssbtractor.com may have a manual for your AC F100 forklift
Google: Allis Chalmers F100 for other possible sources.
Thank You much for the replies
The size of the counterweight equals the capacity. Therefore, a 10,000 lb forklift has a counterweight weighing 10000 lbs. The weight of a forklift equals approxiamtely double the capacity. Therefore a 10,000 lb capacity forklift would weigh approximately 20,000 pounds, approximately. Then don't forget to add the weight of the materials being hauled around, plus the operator and the cylinder.
chuck:
Google: ALLIS CHALMERS F100242PS
A unit from a previous auction is listed by passyauctions.com as 10,000 pounds (lifting capacity). Actual truck weight is most likely something over 5 tons.