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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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