The 19 speed power shift in the early JD 7800s was a hard shifting transmission. Nothing like the JD 4450 15 speed PS. I personally like the power quad transmission. You have four power shift gears in each range. Plus the range shifter is synchronized. On the JD 7810 you could get the 20 speed quad range. So therefore you had the faster transport speeds. The original 16 PQ transmission only had a 18 mph top speed. The 19 speed PS had a top speed of 25 mph. I own three power quad transmission tractors. I have owned a 19 sp JD 7800 I only kept it three years. I disliked the shift on it. On certain shifts it would realy jerk when cold. It was some better warmed up but not much.
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Today's Featured Article - Tractor Proflie: John Deere Model R - by Staff. The John Deere Model R, the last of the lettered tractors, was the first diesel-powered tractor produced by John Deere with a gasoline starting engine. It was also the first tractor they produced that had an optional steel cab. The photo above shows the tractor w
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