LiftMaster 41C4470 Gear & Sprocket Assembly – ATS211 & ATS211R Chain Drive

The LiftMaster 41C4470 is a genuine replacement gear and sprocket assembly designed specifically for compatible LiftMaster and Chamberlain ATS-series chain-drive garage door openers.

The assembly transfers motor rotation through the worm and drive gears to the chain-drive sprocket, allowing the opener to move the trolley and operate the garage door.

It is commonly replaced when the original nylon drive gear becomes stripped, the sprocket shaft wears, or the opener motor runs but the chain and door no longer move correctly.

### Product Features

- Genuine LiftMaster / Chamberlain replacement part
- Part number 41C4470 / 041C4470
- Complete gear and sprocket replacement assembly
- Designed specifically for ATS-series chain-drive openers
- Compatible with ATS211 and ATS211R
- Includes drive gear and worm gear
- Includes helical gear and retainer
- Includes sprocket and shaft assembly
- Includes bearing plate
- Includes spring washer and thrust washer
- Includes retaining ring
- Includes 2 roll pins
- Gear grease included
- No programming required

### Specifications

- Manufacturer: LiftMaster / Chamberlain
- Part Number: 41C4470
- Alternate Number: 041C4470
- Product Type: Gear & Sprocket Assembly
- Drive Type: Chain Drive
- Compatible Models: ATS211 / ATS211R
- Application: Garage Door Opener Drive System
- Quantity: 1 Complete Kit

### What Is It Used For?

The gear and sprocket assembly transfers power from the opener motor to the chain.

During operation:

Motor → Worm Gear → Drive Gear → Sprocket → Chain → Trolley → Garage Door

The worm gear turns the main drive gear, which rotates the sprocket and moves the opener chain.

### Common Signs of a Failed Gear & Sprocket Assembly

Replacement may be needed if:

- Opener motor runs but chain does not move
- Door does not open or close even though motor runs
- White plastic gear teeth are stripped
- Plastic shavings are visible inside the opener
- Sprocket leans or moves excessively
- Chain becomes loose unexpectedly
- Grinding or clicking noise comes from the powerhead
- Grease around the gear assembly is contaminated with plastic debris

These symptoms may also be caused by a damaged chain, trolley, motor, rail, or improperly balanced garage door.

### Compatibility

The 41C4470 is specifically designed for:

- LiftMaster ATS211
- LiftMaster ATS211R
- Compatible Chamberlain ATS applications using the same drive assembly

Always verify the opener model and original part number before ordering.

### Important Compatibility Notice

This is NOT the common universal LiftMaster residential gear kit.

Do not confuse it with parts such as:

- 41A2817 / 41A281
- 41C4220A
- 41A4885-series assemblies
- 41A5668 ATS gear assembly

The 41C4470 is specifically intended for ATS211 / ATS211R applications.

### Kit Components

Includes:

- Sprocket and shaft assembly
- Drive gear
- Worm gear
- Helical gear with retainer
- Bearing plate
- Spring washer
- Thrust washer
- Retaining ring
- 2 roll pins
- Gear grease
- Required replacement hardware

### Why These Gears Wear

The main drive gear is designed to wear before more expensive opener components are damaged.

Premature gear failure can also be caused by:

- Garage door that is too heavy
- Broken or weak springs
- Binding rollers or tracks
- Excessive chain tension
- Poor door balance
- Operating a mechanically damaged door

If the original gear failed, inspect the garage door before installing the replacement.

### Package Contents

Includes:

- 1 – LiftMaster 41C4470 Gear & Sprocket Replacement Kit

Motor, chain, rail, trolley, opener housing, and other components are not included unless specifically stated.

### Important Installation Note

Disconnect electrical power to the garage door opener before removing the cover or servicing the drive assembly.

After replacement:

- Apply the supplied grease to the new gears
- Verify correct gear engagement
- Check chain tension
- Confirm sprocket alignment
- Make sure the garage door is properly balanced
- Test the opener through several complete cycles
- Test the safety reversing system

Do not operate the opener if the garage door is binding, excessively heavy, or improperly balanced.