Delta 28-185 bandsaw cuts crooked after 4" of straight cut adjustments have been made as per manual

Sounds like your blade is getting hot, causing it to expand, causing it to be too loose. The blade gets hot when it's teeth are rubbing or scraping the material more than they are cutting. . You might see some improvement by increasing the blade tension and feeding the material a bit more aggressively. . But you will see greater improvement by using a blade with fewer teeth. For a given blade, the thicker the material is, the more teeth there are engaged in cutting at the same time, so each tooth gets a smaller share of your feeding force. . The optimum number of teeth that should be engaged in the cut at a time varies by the material, the style, quality and condition of the blade, and the rigidity of the saw---- but you can use 3 to 10 as a rough guide. . Good luck, and thanks for using FixYa. Al Kupchella

I have this same saw. It sounds like you do not have the tension on the blade set high enough, or the tensioner is not tight enough so the blade starts to wander. hope this helps. Joe