Does it roll coal when you give it throttle? If it does, pull the air filter and clean it. If it doesn't... you have a fuel problem. I had to clean the air cleaner mesh on my 66 5000 this summer. It was FULL of cluster flies.... so much so that the tractor could not attain high idle, never mind pull.
Fuel problems on the simms could also relate to a failed lift pump, or the previously mentioned problems with a dry cam box.... but as often as not that results in the pump rack sticking in one place... and a complete failure to start or a run away condition. If it starts and idles I'd be inclined to look elsewhere. IIRC, they used the Simms pump up until 12/74 on the 5000 before switching to the DPA rotary. I'd also check the filters and tank outlet for proper flow before condemning either pump...
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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