Выражение встречается в следующем контексте:1. Lifting Slack. With marker unfolded, adjust chain to a length of 67 inches as shown. Slowly fold marker while observing disk. If marker disk slides across the ground more than a foot before chain and linkage lifts it up, the chain is too long.

Remove bolt (1) and shorten chain one or two links. Check adjustment by repeating folding process.

If chain is too short when marker is unfolded, it will prevent end of marker from dropping into field depressions, causing skips in your marker line. Correct this condition by lengthening chain one or two links.

Устранение провисания (цепи)????

Заранее спасибо

на мой взгляд обычные выражения.