Garage Door Opener Gear Replacement Las Vegas: Stripped Drive Gear Symptoms and Repair

When the motor runs but the door does not move, a stripped drive gear is a common cause. Stop using the opener and call us. Emergency service is available 24/7.

What a stripped gear looks and sounds like
Why gears strip, and how to stop it happening again
Gear and sprocket replacement for your model
The total given before work starts
Emergency service available 24/7

Call (702) 829-2196

Describe the Problem

What the Drive Gear Does

In many openers, the motor turns a worm gear and drive shaft, and a plastic helical gear connects them to the sprocket that moves the chain or belt. That plastic gear is the part that wears out. A repair guide from Sears PartsDirect says that if the gear and sprocket assembly breaks, the motor runs but the door will not move.

Some technicians describe the plastic gear as the part that gives way first, before the motor or the board. That is why the failure often stays limited to one part, if you stop using the opener quickly.

Garage door opener motor unit hanging from the ceiling above the door tracks

Quick answer

The motor runs, but the chain or belt does not move
White plastic shavings may collect inside the housing
Stop using the opener
A technician replaces the gear, and checks the door

Signs of a Stripped or Worn Drive Gear

Match what you notice to the likely cause.

What you notice	What it usually means	Next step
The motor runs, but the chain or belt does not move	A stripped drive gear, or a broken gear and sprocket assembly	Stop using the opener and call us
White plastic shavings in the housing or on the floor below	A stripped plastic gear	Do not keep running the opener
Gray or black debris around the top of the shaft	A worn bushing or shaft. The whole assembly may need replacing	Call us
Grinding from the motor unit while the door moves	A worn gear	Read our grinding guide
The motor hums and the door does not move	A stripped gear, a failed capacitor, a locked door, or a spring problem	Read our humming guide
The door moves a few inches and stops	Force settings or a binding door, before the gears	Read our stops halfway guide

Why Drive Gears Strip

Fixing the gear without fixing the cause can mean doing it twice.

A heavy or unbalanced door

A weak or broken spring makes the opener lift more weight than it was built for. This is a common reason gears strip.

A binding track or worn rollers

A door that drags makes the opener strain, and the gear takes the load.

Age and wear

Plastic gears wear out. Many openers last 10 to 15 years, according to House Digest.

Heat

Las Vegas hit 120 degrees on July 7, 2024, according to the National Weather Service. Heat is hard on plastic parts and on grease.

Heavy daily use

An opener that runs many cycles a day wears its gear faster.

Force set too high

A force setting that is too high can load the gear in a jam. Settings affect the safety reverse, so a technician should set them and test.

What We Do for a Stripped Drive Gear

We confirm the gear is the problem, check the door, and give you the total before we start. Read what changes the repair cost, or see our guides to an opener that is humming or not working, or to a failing opener motor.

View from inside a garage through the open door to a driveway, with an opener unit hanging from the ceiling

Our steps

You call or send the form. Tell us the brand, the model number if you can find it, and what the opener does.
We check the door first. We test the springs, balance, tracks, and rollers, so a new gear does not strip again.
We replace the gear and sprocket assembly with the correct part for your model.
We test everything. We set the limits and force, check the remote, and test the safety reverse.

Safe steps

Stop using the opener. Do not press the button again and again.
Note what you see and hear. Motor running, chain not moving, any shavings.
Find the model number on the motor unit label if you can do it safely from the floor or a stable ladder.
Call us. Tell us the brand and the symptoms.

Do not

Do not open the motor housing, because mains power runs inside. Do not force the door by hand if it feels heavy. Do not touch springs or cables. DASMA says they are under extreme tension. See our emergency repair page if the door is stuck.

Where We Repair Openers in the Las Vegas Valley

We cover Paradise, Henderson, North Las Vegas, Summerlin, Spring Valley, Enterprise, and Centennial Hills.

See Our Service Areas

Drive Gear Questions in Las Vegas

What does the drive gear in a garage door opener do?

In many openers, a plastic helical gear turns a worm gear, a drive shaft, and the sprocket that moves the chain or belt. If it strips, the motor runs but the door does not move.

How do I know my opener’s drive gear is stripped?

The motor runs, but the chain or belt does not move. You may also find white plastic shavings inside the housing. Stop using the opener and call us. Do not open the housing yourself.

Why did my drive gear strip?

A heavy or unbalanced door is a common reason, because it makes the opener work harder than it was built to. Age, heat, and heavy daily use wear the gear too. We check the door’s balance when we replace a gear.

Can a new gear strip again?

Yes, if the cause is still there. A door that is out of balance or binding can strip a new gear. That is why we check the springs, balance, and tracks first.

Does a stripped gear mean I need a new opener?

Not always. Many stripped gears can be replaced. Repair often makes sense for a newer opener with one worn part. If the opener is past 15 years or keeps failing, replacement may make more sense. See our replacement page.

What if the gray or black debris is at the top of the shaft?

The bushing or the shaft may be worn, according to a repair guide from Sears PartsDirect. In that case the whole gear and sprocket assembly may need replacing, not just the gear.

Is it safe to keep using an opener with a stripped gear?

No. Stop using it. Pressing the button again and again strains the motor, and the door may not move at all. If the door is stuck, see our emergency repair page.

Can I replace the gear myself?

We do not recommend it. The work means opening the motor housing, where mains power runs, and the parts must mesh correctly. We replace it and then test the limits, force, and safety reverse.

How much does drive gear replacement cost?

It depends on the opener model and the age of the opener, and on whether the door needs other work. You get the total before work starts. Our repair cost guide explains what changes the price.

Do you replace gears on all opener brands?

We repair LiftMaster, Chamberlain, Genie, and Craftsman openers, and other supported brands. Gear kits differ by model, so tell us your model number when you call.

Call King Garage Opener for Drive Gear Replacement

Tell us the brand and what the opener does. We confirm the cause, check the door, and give you the total before we start. Emergency service is available 24/7.