Try putting some pressure to that breather port when the engine is running. The 300U system needs to have the line to the pump primed if the fluid level drops too low. You may have lost prime. It only takes about 5 psi and takes maybe 5-10 seconds. When the pump primes you will hear a change in engine sound while it brings the system up to pressure. If it doesn't prime in a minute or so, then it's time to take the reservoir cover off and check the screen. I used a engine hoist to remove the cover on my 300U. It isn't all that heavy (maybe 40-60 lb?), but it's awkward, and you don't want to set it down on a flat surface as you'll crush the screen.
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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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