The spring is an overcenter design that assists pushing the pedal own as the freeplay is used up in the first 1.5 inches of travel. It is not strong enough to overcome the pressure plate primary springs, but it keeps the pedal pressure under control. It does nothing when the pedal is all the way up, because it is over center. The free play should be as above. If much more, the pedal may travel so far that the clutch doesn't disengage. The throwout bearing should be clear of the fingers by at least 1/16" with the pedal all the way up. When pushing the pedal, the cab must not move, nor should the engine move forward! If they move, the pedal travel will be way out of specification because the movement will take up intended linkage motion. That is why many vehicles are now either hydraulic, or cable operated. Neither of which apply force to the cab or clutch housing. Jim
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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