Why a Heavy Iron Gate Starts to Drag

Post settlement and hinge wear look identical when a gate scrapes the pavement, though they have different fixes, as the notes at carlsbad iron gates new trouble explain for heavy leaves in Carlsbad, CA. A wrought iron gate that dragged lightly in spring and scars the driveway by fall has usually lost level in one specific place. The scrape shows the gate moved, not what moved it.

Check the post before the hinge

Hold a four foot level against the hinge post on both faces. If the bubble reads out of plumb toward the latch side, the footing has shifted or the soil under it has settled, which is common on slopes above Buena Vista Lagoon after a wet winter. If the post is plumb, the problem sits in the hinge or the frame.

Reading hinge wear

Lift the latch end of the leaf by hand. If the free end rises a quarter inch or more before the hinge pins take the load, the pin and bushing are worn. A hinge on a heavy steel leaf carries the weight on a few square inches, and in coastal air near La Costa the pin surfaces rust and ream out far faster than inland.

Frame sag at the weld

Sometimes neither post nor hinge is at fault. A steel frame whose welds have cracked at the lower corner droops on the latch side, and the leaf stops being a rectangle. Measure the two diagonals corner to corner. If they differ by more than a quarter inch, the frame has racked and needs re-welding or a diagonal brace before anything else is adjusted.

What a drop rod does on a sloped drive

A drop rod is a steel pin that slides down into a hole in the pavement and holds the leaf in position when it is open or closed. On a sloped drive it keeps a parked leaf from drifting downhill and takes the swing out of the frame. It does not cure a dragging gate, though it protects the hinges from the shock of a leaf pushed by wind off the water near Oceanside.

Fixes that last

Settled posts need the footing reset or reinforced, since shimming the hinge only hides the movement. Worn hinges are replaced with adjustable ones, and a racked frame is squared and welded. After repair, finish bare steel with primer and powder coat or a zinc rich paint so rust does not return, and check clearance again after the first rain in San Diego County.