The gear is on a tapered spline at the top of the shaft and can often be a stinker to get to break free. Here's how I do it:
1 - Jack the front wheels off the ground. (Jack beneath the clutch housing then crib for safety!)
2 - Remove the lower bolster/front wheel assembly by undoing the 4 bolts thru the the mating flanges. Be sure to note the position of the extended head stop bolt - this bolt must be reassembled in the same location!
(Removing the mass of the bolster/front wheel assembly from the pivot shaft greatly enhances the effectiveness of the hammer blows that will follow...)
3 - Remove the castle nut from the top of the pivot shaft, turn it over and thread it back on until it is just flush with the top of the shaft. This is to prevent mushrooming the pivot shaft threads in the next step.
4 - Lay a thin scrap of brass, copper, aluminum or what have you on top of the pivot shaft to protect the nut/threads, then give it a lick with the biggest hammer you've got. With luck the shaft will pop free of the gear - the nut will keep it from dropping out of the upper bolster.
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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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