I have a Toyota 2fg20 forklift we have had around the shop for several years. The hydraulics have all ways been a little sketchy. Then it sat for about a year and when I went to use it the thing would barely go up at all. Then I noticed if steering wheel was turned all the way to lock it would make the forks jump up just a little bit when i would let go of wheel. I put an overhaul kit in the main hyd. cntrl valve and it work but not perfect. but before i did that i changed all filters the one in tank hyd. was covered in a film and a little dirty cleaned tank. It worked for a while then not at all. Any help would be sooo appreciated. cant find manuals on this thing anywhere Thanks, Ron