Common issues with tripping are from bent trip links, or oil on the friction surface. There is a portion of the trip mechanism where one part moves another from friction as a sort of slip clutch. If that gets oil on it, the trip wont work when its supposed to.
If you encounter slippage and the idler tire is good, its usually from parts not moving freely due to old hard grease, or bad motor mounts that allow the motor to sag out of the correct position.
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