Garage Door Broken Spring & Snapped Cable Replacement — Precision Counterbalance Overhaul
Counterbalance springs and braided steel lifting cables do all the heavy lifting every time your garage door opens. Rated for roughly 10,000 to 15,000 cycles, fatigue eventually causes springs to snap with a loud bang or lifting cables to fray and bird-nest around the tapered winding cones. We carry matched pairs of high-tensile galvanised cables, nylon rollers, and calibrated springs for every major British and European door manufacturer.
Technical Specifications & Component Coverage
| Engineering Parameter | Specification & Coverage Standard |
|---|---|
| Cable Specification | 3mm & 4mm 7x19 braided galvanised aircraft-grade steel wire ropes with swaged thimbles and stop ferrules |
| Spring Assemblies | Overhead shaft torsion springs (single & twin), side-mounted multi-spring tension packs, and enclosed box-section springs |
| Spares Stocked | Garador (C-type, F-type, MK3C/MK4), Hormann, Henderson (Premier, Doric, Merlin), Cardale, Wessex, Birtley & Kingdoor |
| Recommended Practice | Cables and cones are always replaced as a matched left-and-right pair to ensure equal drum tension and level closure |
Canopy vs. Retractable Gear: Diagnosing Your Up-and-Over Mechanism
UK up-and-over garage doors use two distinct lifting geometries. **Canopy gear** runs vertically in side tracks on small nylon rollers while two wire cables wind onto tapered plastic cones at the ends of an overhead torsion spring shaft across the top frame. When a canopy cable snaps, the door twists diagonally and wedges tightly in the jambs. **Retractable gear** uses horizontal ceiling tracks and multi-spring tension assemblies mounted down the side frames—the preferred setup for electric boom automation. We carry complete cone-and-cable kits, spindle rollers, and pivot arms for both systems, including obsolete Henderson and Cardale models.
Sectional Garage Door Torsion Shaft & Drum Re-Tensioning
Modern insulated sectional doors (such as Hormann LPU42 and Garador Linear) rely on heavy-duty torsion springs mounted on a solid or tubular steel shaft above the lintel. When a sectional torsion spring fractures, the electric boom operator will immediately detect excessive load and halt travel to protect its drive belt. Our technicians calculate the exact wire gauge, inside diameter, and active coil count required for your door's weight, fit replacement matched torsion springs, inspect the aluminium cable drums and bottom bracket safety catches, and balance the door so it holds stationary at waist height with one hand.
What Our Engineers Complete on Site
- Matched pair replacement of frayed, tangled, or snapped steel lifting cables and worn plastic winding cones
- Calibrated replacement of fractured overhead torsion springs and stretched side extension spring packs
- Obsolete Henderson, Cardale, Wessex, and early Garador MK3/MK4 cone, roller, and spindle overhauls
- Sectional door cable drum, bottom roller bracket, center bearing, and intermediate hinge replacement
- Anti-drop safety brake inspection and tension equalization to prevent uneven frame wear
- Conversion of heavy manual doors to smooth, finger-light operation with full 12-month parts guarantee