The amount in the owner's manual is enough IF everything is working fine.
Problem is everything is NOT working fine.
There is a suction tube that is supposed to be buried deep in the oil so it can't suck air. That tube is held in place by an o-ring which can sometimes fail or sometimes gets damaged when putting the tractor back together. This o-ring is above the normal level of the oil. That is where it is sucking air. Putting 5 extra gallons of oil in covers this area so it can no longer suck air.
There is no permanent fix other than to pull the tractor apart and replace the o-ring.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
... [Read Article]
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1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
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