There are a series of Blue Ribbon Service Manuals that pertain to hydraulics that I found helpful in rebuilding the valves and power steering on my 240 and 340 Utilities. They are
GSS-1278 Hydraulics: Valves and Systems GSS-1280 Hydraulics: Troubleshooting GSS-1279 Hydraulics: Pumps GSS-1284 Hydraulics: Cylinders
I know the Troubleshooting one has specs on the 300; don"t know for sure if the 300 had same hydraulics valves as those of 240, 340 etc for which valve rebuilding is detailed in 1278.
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Today's Featured Article - Tuning Up Your Tractor: Cooling and Fuel Systems, Hoses and Belts - by Curtis Von Fange. Our tractor is coming right along. The old oil and filter has been taken to the recycler and the air filter replacement has breathed new life into our motor. Let's take a closer look, now, at the cooling system since it has to work so hard in the summer heat. Cooling systems can be real cantankerous in their old age. Radiator cores clog up with rust, lime or other mineral deposits and the fins clog up with weed seeds and debris. The metal headers slowly corrode away from years of use and
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