A 100 is a trailer type mower, I believe the 3-point model was a 130 (later updated to a 1300).
The one behind the H is a 100, the one mounted on the H is an 1110:
And just for comparison sake, here is a 120 semi-mount:
Check to see that there is no slack in the wobble box. When you move the pulley, the bar should be moving back and forth.
There shouldn't be oil in the box, there are either 1 or 2 grease zerks under plugs. Do NOT over grease those, the seals will go out and you will need to have the box rebuilt (about $700 these days). They are very reliable and cut nicely if properly maintained. I think Dad said his 100 was bought used by him in the late 60's, rebuilt the box in the mid-70's and hasn't been touched since then.
My father-in-law has an 1100 he bought new in 73 or so and has never been apart. Has cut tens of thousands of acres with it. Proper maintenance is key.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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