Calibrated cable drum replacements, shaft alignment, and keyway adjustments to prevent cable slippage and door jamming.
Cable drums are cast aluminum wheels keyed to both ends of the torsion spring shaft. They are designed with spiral grooves to wind the lift cables evenly as the door opens. If a drum cracked, develops worn grooves, or slips on the shaft, the cables will wind unevenly, jamming the door. Replacing damaged drums is essential to restoring safe and reliable operation.
Our technicians use replacement drums matched to your door's lift configuration. If you need a drum replacement, we secure the spring tension, slide the shaft, and align the new drums. We also inspect the shaft keyways and set-screws to prevent future slippage.
Drums are under high tension from the springs. Replacing them requires releasing the spring tension and locking the shaft in place to prevent it from spinning. Our team has the professional tools and training to handle this complex repair safely, protecting your door panels and surrounding framing.
Worn drum grooves can cause the cable to slip off, wrapping around the shaft and jamming the system. During our replacement service, we inspect the lift cables for fraying, check the spring tension, and verify that the shaft is level, helping to prevent future cable issues.
Real technicians from our GTA service vehicles executing precision calibration and safety tests.
High-cycle torsion and extension springs selected and calibrated exactly to your door's weight and width dimensions to guarantee balance.
Replacement of frayed or snapped aircraft-grade steel lift cables. Re-anchoring and alignment on cable drums to prevent slack.
Straightening or replacing bent vertical and horizontal tracks. Re-anchoring tracks to wall framing to ensure parallel movement.
Understanding the mechanical design and load distribution of your residential or commercial garage door system is essential to maintaining high safety standards.
Standard lift drums (such as APCO 400-8 or OMI 8-inch) are flat with spiral grooves, designed for doors that bend immediately into the horizontal tracks. High-lift drums feature a tapered section that transitions into a flat section, providing extra lifting force as the door raises vertically before curving back. Vertical-lift drums are fully tapered to manage the weight as the door lifts straight up. We select the correct drum profile for your system.
Cable drums are secured to the shaft using square keys inserted into matching slots (keyways) and locked with set-screws. If the set-screws loosen, the drum can slide along the shaft, causing the cable to slip off the drum. We check and torque the set-screws, inspect the keyways for damage, and ensure the drums are aligned parallel to the tracks.
We secure the door, lock the spring shaft, and safely release the spring tension using winding bars.
We slide the shaft, remove the damaged drum, inspect the keyway for damage, and clean the shaft.
We slide the new drum into position, lock the keyways, thread the cables, and re-tension the springs.
Detailed answers regarding overhead door mechanics, maintenance cycles, and safety practices.
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