Chain Slack and Sprocket Wear
Slack is normal on a gate chain and a tight chain is a fault, which surprises most owners who tension one for the first time. The adjustment figures listed at Metal Gate Repair Pearland, TX E Wolontariat give a target sag rather than a feel, because on a Pearland driveway a chain pulled up hard destroys the metal it runs on faster than a loose one does.
How Much Sag
Roughly half an inch to an inch of movement at the middle of the longest free run, measured with the gate at rest. Enough that the chain hangs visibly, not enough that it slaps against the guard when the drive starts. Both extremes cause damage and the window between them is wide.
What Stretch Actually Is
A chain does not stretch as metal. The pins and bushes wear, each joint gains a fraction, and multiplied across a long run it reads as extra length. That worn chain no longer matches the pitch of the sprocket, so the load falls on one or two teeth instead of being shared.
Sprocket Damage
Teeth that have gone hooked, with a curl on the driving face, mean the chain has been running worn for a long time. A new chain on a hooked sprocket will be ruined within months, so the pair is replaced together. That is the single most common mistake on this repair.
Lubrication in Dust
Heavy oil on an exposed chain collects grit and turns into a grinding paste. A dry film lubricant, or a light oil applied sparingly and wiped, lasts better on a driveway gate. The chain also gets a wipe before any oil goes on, otherwise the old grit stays in the joints.
Anchors and Guards
Check the brackets at both ends of the run, since a loose anchor mimics a stretched chain exactly. Check the guard is present and clear, because a chain that can be reached is a hazard as well as a maintenance problem. Both take a minute and both get missed.
Where the Chain Meets the Gate
The anchor brackets are welded or bolted to the frame near each end of the leaf, and they take the whole driving force. A cracked bracket or an elongated hole mimics slack exactly. Both ends are checked whenever the tension is adjusted, along with the alignment of the chain run against the sprocket.
Noise as a Guide
A rhythmic clatter that rises with speed is a worn chain. A single knock once per cycle is more likely a flat spot on a roller or a joint in the track. A grinding that appears only under load points at the operator gearbox rather than at the drive line, and that distinction saves an unnecessary chain.