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 - On the Road with Dave Gohl: Tractor Club Beginnings - by Dave Gohl. I was surprised about a month ago when I got a call from a fellow tractor croonie. His message was interesting and to the point. He's says "Dave, I've been thinking about starting a Two Cylinder club for our area. What do ya think?" It was a loaded question. I said that I would be interested, and was wondering what his next step was. (Although I was talking under my breath, since I thought of this some years ago) My friend, Arlyn Lamb of Lakeville, Minnesota was sincere in his miss
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