The cups don't travel down below the surface of the head. They are there to provide even pressure on the top of the valves since they do not use a standard push rod setup.
The cups/valves get pushed down about .75-1" when the lever is pushed.
If you pop the valve cover you can see all of this stuff right there in front of you. You can then pull/push the decompression lever and see how it is functioning and compare it to how it should function. You could also take a look at the parts diagram (go to the CNH website and navigate from there) The diagram may help you see how everything in there works. I never fully comprehended everything that happened to go from gas to diesel until I took my valve cover/head off and watched it all happen.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
... [Read Article]
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