The extension effectively makes the clutch pedal travel farther to do the same job. As a result the point at which it disengages (no longer drives the wheels)will be substantially farther from the resting position (foot off the pedal) The test: With the tractor off, and brakes locked. stand next to the clutch pedal. Put your hand on the pedal and push it down (forward). As you push the clutch pedal arm will be pulling on an external return spring. The pedal should move easily with only this spring tension for very close to an inch, to an inch and an eighth. If it continues down with little resistance it is out of adjustment (freeplay) and needs to be adjusted to the range above. If it tightens up and gets substantially harder to push at the Inch range, then the freeplay is correct. Then the issue is why it has this exaggerated range of motion. One possible answer is partially sheared pins in the throwout fork to cross shaft. Another is a warped disk that is not letting the Pressure plate release unless it is pushed in too far (less likely). M clutches are hard to push. If you need the effort reducing lever, OK adjust to work as best as possible.
You state that the point of engagement is almost at the bottom, and it is jerky (most tractor clutches are jerky and designed to be delt a starting force equal to a drag race every time it is started under load. (If it were mine I would put the standard clutch lever(shorter)on it to see if it eased the engagement issue, or made it too hard to push. I was 140 pound teen driving them in the 60s, and it was not an issue then. Let us know. Jim
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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