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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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