Hi David, sounds like classic junk in the fuel tank that is common on the 74/84 series tractors BUT you said that engine does not loose RPM.
Next question does it have T/A (Hi/Lo lever on dash opposite throttle lever)? If so does it do it in T/A LO or only in T/A Hi? To test clutch drive tractor in 3rd Hi and apply brakes hard, it should drag the engine RPM down. If the engine is not dragged down and ground speed stalls then clutch or HI T/A is slipping. Try again with tractor in LO T/A, if engine is not dragged down and ground speed is stalled then clutch is slipping.
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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
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