asyrp43: Those levers have double locking nuts on the pivot shaft, and a friction pad behind round base of lever. The double nut changes tension on the friction pad. Between the nuts and friction pads are a sleeve, cotter pin and spring.
You could also have friction pads worn out. Also the sleeve, sometime those rust freeze to pivot shaft. If that happens the best cure is dismantle the lever assembly, clean it up good, replace spring and friction pad. Those don't adjust accurately if rusted badly.
I've replaced the springs and friction pads on my SA and 130, however not the 140 yet. They seem to work well for 40 years. It's not a bad job getting them apart, there is a roll pin in base of lever, through the shaft.
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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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