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If it had stopped cutting and won't turn on again, it sounds like the problem is with the motor of the band saw. I suggest you contact Doall or if you have vast electrical knowledge, open the motor and check yourself which part of it have failed.
Typically, the automatic lowering device is a hydraulic cylinder controlled by a bleed valve. The more the bleed valve is opened, the faster the blade will move downward into the material. If the blade is falling too fast, the cylinder may be leaking fluid past the valve. This will also cause the blade to slip or get stuck in the metal material being cut. You need to adjust the bleed valve there man.
i have a great company for you to contact to find the perfect blade for your needs. go to www.doall.com and click on the doall sawing tab and find the customer support phone number. call them during business hours and you can get at blade tech on the phone that will ask you a few questions to what saw you have and what your cutting and they can put you on the perfect blade. i use them for a bandsaw we use at work, we manufacture awnings and signs. i get all my bandsaw blades from Doall
I used to work for Doall saw company. While I am not familiar with the particular model you have, I have seen issues like it in Doall saws.
Firstly, If bearing guides are not adjustable, replace them. There should be only about a 32 of an inch play between them (in addition to the thickness of the blade). Secondly, for a prodution horizontal bandsaw you should have the blade tensioned a @30,000 psi. Thirdly, if after that, you are still having problems, I would suggest checking the bearings on your drive and idler wheels for runout (in addition to the condition of the tires).