Behind the fluid movement of a sectional door lies a small, highly organized mechanism: cables, drums, pulleys, and a shaft that transmit the tension from the springs to the door panel. Each part has a specific role, and the failure of just one is enough to jam the entire system or, worse, cause an accident.
This guide lays the foundation: the role of each component, how wear manifests, and how to select replacement parts. It is the starting point for our series on the lifting system and links to more detailed articles on each topic.
The role of lifting cables
Cables connect the bottom of the door panel to the winding system. They support a large part of the door's weight and transmit the force from the springs. On a torsion system, they wind onto drums located at the ends of the shaft. On a tension system, they pass through pulleys connected to the springs. In both cases, they are under constant stress.
A cable wears out over time: strands fray, corrosion sets in, and wear patterns appear at contact points. A frayed cable must be replaced immediately, in pairs. We offer cables and accessories for sectional doors, including the pair of cables pre-2015, the pair of cables from 2016 onwards, and a custom-made pair. For the procedure, consult our cable replacement guide.
Drums: the component that winds the cable
A drum is a grooved part that guides the cable during winding and unwinding. It is fixed to the shaft by set screws and rotates with it. Its profile determines how the cable winds: the height of the door, the type of lifting mechanism, and the position of the tracks all influence which drum is suitable.
An unsuitable or poorly fixed drum will cause the cable to overlap its turns, leading to jerking and rapid wear. Our drums and pulleys collection includes several models; the choice depends on your door's configuration, which is detailed in our article on how to choose your drum.
Pulleys: guiding and redirecting force
Pulleys redirect cables and reduce friction. On tension spring doors, they are essential: the cable passes through a movable pulley attached to the spring. They are also found at the top of the door to guide the cable toward the drum. A pulley that squeaks, is cracked, or has a worn groove shortens the life of the cable.
Several models exist depending on the range, for example, the pulley with cable support, the pulley with Europa Gypass spring attachment, or the Europa Gypass high pulleys. Check the groove, the axle, and the mounting during every maintenance check.
The shaft, bearings, and transmission accessories
The shaft transmits rotation between the springs and the drums. It comes in hollow or solid versions, generally 25.4 mm for residential doors, and is fixed to the lintel by bearings. Our article on hollow or solid shafts details the selection criteria. We offer the hollow shaft and the solid shaft with keyway, sold by the meter, as well as intermediate bearings and the shaft coupling.
Keys, the small parts that secure drums to the shaft, also deserve your attention. A worn key leaves play and throws off the adjustment. They exist for solid shafts (straight key) and for hollow shafts (curved key).
When and how to replace lifting parts
Lifting parts work together: a new cable on a worn drum damages quickly, and a new spring on a fragile cable remains a risk. When you replace a spring, take the opportunity to inspect the cables, drums, and pulleys. If any are worn, replace them at the same time, in pairs. You can also opt for a kit, such as the Gypass Europa spring and cable kit.
Watch for warning signs: frayed cables, crooked doors, metallic noises, or a cable coming off its pulley or drum. Our articles on cable out of its pulley and crooked garage door help you make the right diagnosis. And remember that any spring-based system remains under tension: see our spring guide.
Conclusion
Cables, drums, pulleys, the shaft, and bearings form a chain: the strength of the whole is equal to that of its weakest link. Understanding the role of each allows you to detect signs of wear and order the right part the first time.
For each element, our dedicated articles provide useful references. And if you are hesitant, our team will help you validate the reference suitable for your door.
FAQ: lifting system
Should both cables be changed at the same time?
Yes. Both cables work the same way and wear out at the same rate. Replacing them as a pair ensures balanced lifting.
How do I know if my drums are worn?
Look for damaged grooves, cracks, play on the shaft, or cables winding irregularly. In these cases, replace them as a pair.
Are the parts compatible with all brands?
Many of our parts are compatible with common brands (Gypass, FAME, SDA, La Toulousaine, BKF). Always check the product sheet and, in case of doubt, contact us.
Can I replace a cable myself?
It is possible if you are rigorous, but the system is under tension. Release the springs according to the appropriate procedure or entrust the operation to a professional.