Garage door repair, Portland metro and Clark County
Garage door cable and drum repair across Portland and Clark County
We repair frayed, snapped and unwound garage door cables on Portland and Clark County homes, always replacing both lift cables as a pair, and we check the drums, bottom brackets and spring tension that let the old cable fail before the door runs again.
Updated
What you are seeing
Cable trouble shows up low on the door first, where each cable meets its bottom bracket, and these are the signs people notice before they book a cable repair.
- The door closed crooked, with one bottom corner on the floor and the other a few inches up
- A cable hangs in loose loops beside the track instead of running tight up to the drum
- Frayed strands sticking out of the cable near the bottom bracket, often with orange rust
- A snap or a metallic slap from the garage, then the door stopped partway and tilted
- The cable has unwound and sits beside the drum rather than in its grooves
What we do on a cables visit
A cable job is a tension job: we let the springs down, replace both lift cables, inspect the drums and bottom brackets, then set equal tension and rewind, on a light single or a heavy double alike.
Read the door before touching it
We check the cable ends at the floor, the drums on the shaft and the springs before anything moves. A cable rarely fails on its own: a broken spring, a drum that crept along the shaft, or a bracket rusted thin at the floor is often the real cause, and how far the door dropped, and on which side, tells us where to start.
Clamp the door and unwind the springs
Locking pliers clamp the track beneath a roller to pin the door in place, and the opener is unplugged. Torsion springs are let down with winding bars in quarter turns until the cables carry no load; an extension-spring door is raised and clamped so its springs relax. Nobody touches a cable or a bottom bracket while the springs are wound.
Pull both cables and inspect the drums and brackets
Both old cables come off, even if only one failed, so the new pair starts at the same length and stretch. We check each drum for cracks, worn grooves and a loose set screw, and each bottom bracket for rust and a worn pin. Any part we replace goes on the floor beside the door so you can see why it came out.
Seat the new cables and set equal tension
Each cable loop goes over its bottom bracket pin, runs up to its drum on the shaft, and locks into the drum's notch. We wind it into the grooves, tighten the set screws, then hold the shaft with locking pliers while we match the tension on the second side, which is what lets the door come down flat instead of leaning toward one jamb.
Rewind, level and test
The springs go back to their full turns and we watch the bottom seal meet the floor across the whole width. Then we reconnect the opener, run the door several times, check that both cables wrap evenly, test the photo-eye reverse, and confirm the door holds at halfway by hand. You see the old cables and the posted price before we pack up.
Why one side of the door drops when a cable fails
Each lift cable holds up its own bottom corner, so when one snaps or comes off the drum, that side loses its support and falls while the other side stays hung on its cable.
The door ends up racked across the opening and jammed against the tracks, and the intact cable is still carrying spring tension. A door in that position can drop farther or swing loose when someone tries to free it.
Stop, unplug the opener at the ceiling outlet, and make sure nobody walks beneath a door that is hanging crooked. Running the opener on a door hanging from one cable bends the top section and can pull the second cable off its drum.
Why a lift cable keeps jumping off its drum
A cable jumps its drum when it goes slack, which happens when one side of the door stops early, the springs lose tension, or the drum moves on the shaft.
Both drums ride the same shaft, so if one bottom corner lands on a bike tire while the other keeps descending, the stopped side pays out cable with nothing pulling on it. That loose loop slips out of the grooves.
Quieter causes repeat. A set screw backs out and the drum slips, a worn end bearing lets the shaft drift sideways, or springs wound too light leave the cables loose at the bottom of travel. Resetting a cable without fixing the cause just books the next visit.
Drums, bottom brackets and extension-spring pulleys
A cable is only as sound as the three things it connects to: the bottom bracket at the floor, the drum on the shaft, and, on older extension-spring doors, the pulleys that carry it to the spring.
Bottom brackets are the dangerous part. They hold the cable loop under full spring tension and must never be unbolted while the springs are wound, so a bracket with flaking steel or a notched pin gets replaced along with the cables.
Drums wear in their grooves and can crack, and a damaged groove chews up a new cable quickly. On extension-spring doors the cable runs over pulleys on its way to the spring instead, and a wobbling pulley lets it ride off the rim.
Why cables rust from the bottom up in Portland garages
The bottom of a lift cable lives in the wettest spot in the garage, where rain off the car, water under the seal and condensation on the slab collect around the bottom bracket.
NOAA normals for Portland airport show measurable rain on about 157 days a year. Galvanizing slows rust, but once the coating wears through, strands corrode and break one at a time, starting at the loop.
Low and shaded lots have it worse: homes near Johnson Creek in Lents, Kenton lots near the Slough, and Bridlemile under its heavy canopy, where tracks and brackets stay damp long after the rain stops.
Ice adds a second risk. Portland airport logs roughly 32 freezing nights in a normal year and Vancouver nearer 45, and a ridge of frozen slush under one side can stop that corner early and slacken its cable.
What changes the price
The posted price covers two new lift cables on a standard residential door with reusable drums and brackets, and these are the things that add to it.
- Cracked or deeply grooved drums that would fray new cables
- Bottom brackets rusted thin or bent where the cable loop sits
- A broken spring found during the visit, which often explains the cable
- High-lift or vertical-lift drums in garages with tall ceilings
- Heavy wood or oversized doors that call for heavier cable
- Worn pulleys on an extension-spring door, replaced on both sides
When a repair stops making sense
A cable repair is worth doing on nearly any door with sound sections, because cables and drums are modest parts and replacing them resets the whole lift system.
It stops making sense when the cable failure is a symptom of a door near the end: a bottom section rusted through where the brackets mount, hinges torn out of the stiles, or wood too rotted to hold bracket bolts. Then we price the repair and a new door next to each other.
Cables: common questions
Is rewinding a loose lift cable onto its drum a safe DIY job?
Not for most homeowners, because the drum and the bottom bracket are both under spring tension. Rewinding a cable means unwinding the springs first with winding bars, and a slip can break a wrist or drop the door. If the door came down level, leave it there, unplug the opener, and text us a photo of each bottom corner.
Why replace both lift cables when only one is frayed?
Both cables share the same age, cycles and rust exposure, so the second one is close behind. A new cable beside an old, stretched one also sits at a different length under load, which tilts the door and wears the drums unevenly. The posted cable price covers the pair, not one cable.
How can I spot a frayed garage door cable before it snaps?
Look at the bottom six inches of each cable with the door closed, where it loops onto the bottom bracket. Broken strands sticking out like bristles, orange rust, a flattened or kinked stretch, or a cable thinner than its partner all mean replacement is close. Use a flashlight and your eyes only, never your hand, since the cable is under tension.
Is it safe to use the opener when a garage door cable is loose?
No, because the door is now held by one cable and the opener will pull it further out of square. The motor can bend the top section, tear hinges, or knock the second cable off its drum. Unplug the opener, keep a closed door closed, and keep everyone clear of a door that is hanging partway open.
Do extension-spring doors use the same lift cables as torsion doors?
They use similar galvanized cable, routed differently. Each lift cable runs from the bottom bracket up over pulleys and back toward the spring, while the safety cable is a separate line threaded through the middle of the spring. We check both on a cable visit and add a safety cable wherever one is missing.
Does a little rust on a garage door cable mean it needs replacing?
Light surface rust on an otherwise smooth cable can wait, but rust with broken strands, pitting or swelling at the bottom loop means replacement. Corrosion works from the outside in, and the loop at the bracket sees the most water, so in a damp Portland garage we check that loop on every visit.
Related pages
Where we do this
Cable calls follow the weather, with rusted loops on low, wet lots and slack cables after freezing nights, and the places below are on our regular routes.
Ready to get the door moving again?
Call with the symptom, or text a photo of the door and the opener, and we will name the part and the posted price before anyone drives out.