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 - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
... [Read Article]
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