Dock door knocked off its track by a trailer or forklift: what to do next

The short version

When a trailer or forklift knocks a dock door out of its track, stop using that door, keep people and equipment out from under it and leave it where it sits. Do not try to push the rollers back in or run the operator. Tape off the doorway, move loading to another dock, take photos of the track, bottom section, springs and cables, and send them with the door size when you call. A damaged door is usually repaired in a few hours.

Stop using the door and keep everyone out from under it until it is secured
Never run the operator or force rollers back into a bent track
Photos of the track, bottom section, springs and cables help the right parts arrive on the first visit
Move loading to another door so the damaged one can be left alone
Ask what caused the hit so the repair also deals with repeat damage

The first ten minutes after the hit

A dock door that has been struck by a trailer or a forklift can look fine from the floor and still be held up by one bent roller. The springs are still under tension, and the door can drop or swing out of the opening without warning. Treat it as a hazard until someone has looked at it closely.

Here is what to do straight away:

Stop the operator. Turn it off at the disconnect if your site allows it, so nobody presses the button out of habit.
Keep people, pallet jacks and forklifts out from under the door and away from the track on both sides.
Tape or cone off the doorway and the inside apron.
Move the trailer at that door only if it can be done without touching the door or track.
Shift loading to the next dock and let the shift lead know which door is out.

What not to do

Don't try to bang a roller back into the track with a hammer. Don't lift the door by hand to free a trailer unless it is clearly still running in both tracks. Don't cut or loosen a cable. A torsion spring on a large dock door stores a lot of force, and a door that comes out of the track under spring tension can fall or twist sideways.

What usually gets damaged

Most dock door hits follow a pattern. A trailer backs in at an angle, or a forklift mast catches the bottom of a door that isn't fully open. The damage tends to land in the same places:

The bottom section, crushed or folded at the dock edge
One or both vertical tracks, bent in toward the opening
Rollers popped out of the track or snapped at the stem
Hinges and end stiles torn on the lower sections
Cables slack or jumped off the drum on the side that took the hit
Photo eyes or the safety edge knocked out of line or broken

A door that was hit while closing can also end up with a spring that is overloaded on one side. That is one reason we look at the whole door, not only the dented section.

Photos that speed up the repair

The visit goes faster when we know what to bring. Before you call, take photos from a safe distance of:

The full door from inside, showing how it sits in the opening
Each vertical track from the floor up to the curve
The bottom section and the dock edge
The spring and cable area above the door
The label on the door or operator, if you can read it from the floor

Send the door's width and height and its rough age too. With that, we can usually bring the right sections, rollers, hinges and track pieces on the first trip.

How the repair visit works

We start by securing the door so it can't move, then take tension off the springs if the damage calls for it. Bent track is straightened or replaced, rollers and hinges are swapped, and damaged sections are replaced on their own when the rest of the door is sound. Once the door runs, we set the balance, check the cables are seated on the drums, and test the photo eyes and safety reverse before handing it back.

Most dock door repairs take a few hours per door. Replacing sections or a full track run can take longer. We plan the work around your shifts and shipping windows so only one door is out at a time, and you get a quote before any work starts.

Wind and salt at Delta docks

In Delta, a bent door is rarely just a loading problem. Ladner and Tsawwassen are open to wind off the water, and that wind drives rain into any gap. A door pushed out of line by a hit no longer meets its bottom seal or side weatherstripping, so a damaged door can let water and cold air onto the dock floor for as long as it waits. Near Boundary Bay, salt air also rusts springs and cables faster, so a hit door is a good moment to look at hardware that was already wearing.

Stopping the next hit

After the repair, we tell you what we saw. Common causes include trailers backing in off-centre, doors left partly open while forklifts work under them, and no clear stop line on the dock floor. Track guards, bollards and a habit of running the door fully open before loading all help cut repeat damage.

If more than one door at your building is bent or worn, we can plan them into a single visit and work through them one at a time, so the dock keeps moving while the doors get fixed.