Spring Tension: How to Adjust Garage Door Springs Safely
A technician adjusts garage door spring tension; homeowners run the balance test. How to adjust garage door springs starts with that test: door closed, opener released, then a lift by hand to 3 to 4 ft. A balanced door stays there; one that drifts down, rises or feels heavy needs a technician. DASMA publishes the test for consumers and tells North Carolina homeowners to leave springs alone.
How to adjust garage door springs: whose job is it?
Garage door springs are adjusted by a trained technician, because changing tension means working against the stored energy that holds the door up. The homeowner’s part is the balance test, which shows whether the springs need that technician visit.
Spring tension is the force the springs store to offset the door’s weight. This force, called the counterbalance, lets a closed door rise by hand with little effort. Five symptoms show the tension is wrong.
Door drifting down after release
The springs no longer carry the full weight.
Door rising on its own
The springs lift more than the door weighs.
Door heavy to lift by hand
Tension is lost or a spring is broken.
Door rising crooked
One side lifts harder than the other.
Opener straining on the way up
The motor is lifting weight the springs should carry.
A crooked rise can also mean a garage door spring broken on one side of the door. A door that fails because a coil has snapped needs a technician to replace broken garage door springs as a pair, not a tension change.
How do you check garage door balance?
Check garage door balance by closing the door, pulling the red release cord and lifting the door by hand to about halfway. A balanced door stays put 3 to 4 ft above the floor; one that falls or rises needs its springs checked.
The six steps below follow the consumer checklist in DASMA Technical Data Sheet 167. The red release cord is the emergency release: it disconnects the door from the opener so the springs alone hold the door.
DASMA’s checklist cautions that a door can begin to open unexpectedly when the opener is disengaged. Stand clear of the door’s path and keep both hands ready.
Look at the springs from the floor
Stop if a coil shows a gap, and call a technician.
Close the door fully
A closed door cannot fall.
Pull the red release cord straight down
Stand clear of the door’s path. The door is now held by the springs alone.
Lift the door by its handles a few inches
Stop if it feels heavy.
Raise it to about halfway and let go
Halfway is 3 to 4 ft off the floor. Keep your hands ready to catch the handles.
Close the door and reconnect the opener
Run the opener through one full cycle to confirm it latches.
Door weight changes the result. Paint and added parts add weight beyond what the springs were sized for, so repeat the test after either one.
Should garage door springs be tight?
Yes, garage door springs are always under tension, and the right amount is the tension that holds the released door 3 to 4 ft off the floor. Too little lets the door drift down; too much makes it rise on its own.
DASMA Technical Data Sheet 190 ties each reading to the springs. Insufficient spring torque makes a door drift down. Excess torque lifts the door and loads the other counterbalance parts.
Stays at 3 to 4 ft
The door is balanced and the tension suits its weight.
Drifts down
The tension is too low for the door.
Rises
The tension is too high for the door.
Heavy from the first inch
A spring is broken or slack.
The opener does not fix any of these readings. It moves a balanced door; it is not built to lift an unbalanced one.
Can garage door springs be adjusted?
Yes, garage door springs can be re-tensioned, but only by a technician: torsion springs through turns applied with winding bars, extension springs through their attachment points. DASMA tells homeowners not to adjust springs, cables or brackets of either type.
A technician matches the tension to the door’s weight, the spring size and the shaft. The cones, cable drums and bottom brackets stay under that tension while the work goes on, so a slip releases stored energy at once. This page describes what the technician changes and gives no method.
The opener’s force setting does not substitute for spring balance. Chamberlain keeps the setting at the minimum needed and never uses it to compensate for a binding door. A higher setting weakens the auto-reverse that protects people under the door.
How many turns on a garage door spring?
The number of turns on a torsion spring comes from the spring maker’s chart for the door’s height and track radius. It is a technician’s installation figure, not a homeowner setting, and a wrong count either lets the door drift or overloads the cables.
A turn count read from a chart for another door does not carry over. Door height, door weight and track radius all change the figure, which is why this page states no number.
When to call a technician about spring tension
A failed balance test is the point where the homeowner’s part ends.
Call a technician when the door drifts down, rises on its own, feels heavy from the first inch or shows a gap in a spring coil. The technician measures the springs against the door’s weight, restores the balance and replaces springs that are worn out or broken. A spring wears out by cycles, so how long garage springs last depends on how often the door runs. Springs on a two-spring door are replaced as a pair.
After a failed balance test you hear the price before any work starts. Monday to Saturday, a call booked by 12 pm gets a same-day inspection visit. A balance-test callout carries no trip fee. Technicians are independent contractors who work in your area.
Call (833) 752-1196 or request a garage door quote online after a failed test. The phone line never closes, weekends included.
Re-tensioning and replacement are priced differently; spring repair prices are broken down on the cost page.