Reasons:
1) The hauling shaft is not tight, and the bracket clashes the jaw and pad on the seat. 2) The shaft rubs the hooks below the jaw. 3) The spring clashes the seat.
Solutions:
1) Fix the hauling shaft. 2) Check the spring tension, and replace if it is invalid. Fix the shaft or spring. 3) Place the spring seat, and fix the bolt to the suitable position.
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