Hi, could be stuck MCV, if the 684 has remotes, activate one of the remotes without anything connected to the outlets until the hydraulic relief valve makes a buzzing/squealing noise. Sometimes this shocks the system and frees a stuck MCV. Check hydraulic fluid level and replace the hydraulic filter.
Re T/A could be someone disconnected the T/A lever on top of the torque tube under the battery. It is difficult to tell if the T/A is in Hi or Lo if the T/A lever is not working, other than 4th Hi will not be very fast and 1st Lo will be really slow.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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