REFURBISHED - OKIDATA Pull Tractor for ML320 Turbo/ML390 Turbo. The Pull Tractor lets you feed multi-part forms, labels, card stock, etc. The pull tractor can also be used with the rear-feed tractor to provide more precise paper control. This type of form printing is excellent for thicker forms and will save on your printhead costs. Labels print best when using the pull tractor, because you are pulling the label taut for quality printing.