Forklift manuals are copyrighted material, and as such, may only be legally distributed by those authorized by the copy right holder, which is always the local dealer.
they will usually copy a page or 2 of information if you need it, but they are the -only- _proper_ source, and even looking to go around the US intellectual property [trade secrets, trademark, copyright, {anti online-piracy} etc...] laws can create a lot of headaches. my advice is to ask about a specific problem.