Broken or mismatched spring
The spring must match the actual door weight and hardware. A spring can be intact yet poorly matched after a panel, glass, reinforcement, or spring-system change.
Why Is My Garage Door So Heavy?
A heavy door usually means the counterbalance or connected hardware is no longer doing its job. Stop using the opener until the cause is identified.
The opener is not supposed to lift the full door weight
Torsion or extension springs counterbalance the door. If a spring breaks or loses the ability to balance the system, the door can become too heavy for safe hand control and the opener may strain, stop, or move only a short distance.
Do not install a stronger opener to cover the symptom. Motor power does not repair a broken spring, loose cable, seized roller, bent track, added panel weight, or locked door.
Cable, drum, or pulley problem
A cable off its drum, damaged pulley, loose anchor, or uneven cable path can leave one side unsupported. Keep hands away from bottom brackets and cable hardware.
Roller, track, hinge, or panel binding
Damaged rollers, bent track, loose hinges, shifted sections, a manual lock, or impact damage can resist movement. A new spring should not be used to overpower a binding door.
Do not pull the release just to test it
If the door is raised, crooked, or possibly supported by a failed spring or cable, an emergency release can let it move without warning. Leave the door still. If it is fully closed and appears stable, follow the opener manufacturer's instructions, but stop immediately if the door cannot be controlled easily.
Never wind or stretch a spring, move a cable drum, remove a bottom fixture, clamp a raised door, or force a roller back into track. Those parts can release stored energy or door weight suddenly.
What a technician should check
The diagnosis should cover door weight and balance, spring specification, cables, drums or pulleys, bearings, rollers, hinges, track, panels, locks, and opener condition. The cause may involve more than one part.
Get a heavy garage door checked in Northern NJ
Call (551) 279-6408 and describe the door before trying to lift or release it. Literally Garage Door serves our nine-county Northern New Jersey service area and provides a free estimate before approved work begins.