I had the same problem on a 1480. Found a pressure relief pilot valve seat worn which dumped enough oil so the priority valve had no excess fluid to run anything but steering and header lift, nothing left over for reel lift and auger swing.
The wear is even hard to detect with a magnifying glass, but slight leakage at the pilot seat will make a huge leak at the slide valve the pilot controls. with the valve mounted on it's side, the ball hits slightly below center on the seat hole.
After hitting slightly below the hole a million times and rolling into it, it finally wears the hole slightly oval, causing that slight but killer leak.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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