Definition
The grooved wheel at each end of the torsion shaft that the lift cables wind onto as the door opens. The grooves keep the cable feeding evenly; if a cable jumps the drum — often after a spring breaks or the door hits an obstruction — the door tilts and binds in the tracks. Re-seating a cable on its drum requires releasing and re-tensioning the spring system, which is why Door Serv Pro treats drum problems as a professional repair, not a DIY adjustment.
Why this term matters for homeowners
Repair and maintenance terms map to springs, cables, rollers, and tracks — the wear parts that decide whether your door fails on a January morning.
- Use this term to ask better follow-up questions during estimates.
- Look for this language in Learn and Evaluate guides to connect definition to decisions.
- Confirm how this applies to your specific door size, age, and daily use.
Related pages
Category: Repair & Maintenance