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 - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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