---
product_id: 181389546
title: "Replacement for Liftmaster 41C4220A Gear and Sprocket Kit fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models"
brand: "garage stop"
price: "243 Lei"
currency: RON
in_stock: true
reviews_count: 12
category: "Garage Stop"
url: https://www.desertcart.ro/products/181389546-replacement-for-liftmaster-41c4220a-gear-and-sprocket-kit-fits-chamberlain
store_origin: RO
region: Romania
---

# Step-by-step video installation Complete gear & sprocket kit Fits 1/3 & 1/2 HP chain drive models Replacement for Liftmaster 41C4220A Gear and Sprocket Kit fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models

**Brand:** garage stop
**Price:** 243 Lei
**Availability:** ✅ In Stock

## Summary

> ⚙️ Upgrade your garage opener game — don’t get stuck in the past!

## Quick Answers

- **What is this?** Replacement for Liftmaster 41C4220A Gear and Sprocket Kit fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models by garage stop
- **How much does it cost?** 243 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/181389546-replacement-for-liftmaster-41c4220a-gear-and-sprocket-kit-fits-chamberlain)

## Best For

- garage stop enthusiasts

## Why This Product

- Trusted garage stop brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Optimized Performance:** Restores smooth, reliable operation to your garage door with perfect fit and function
- • **Universal Compatibility:** Fits Chamberlain, Sears, Craftsman & Liftmaster chain drive openers (1984-current)
- • **All-in-One Precision Kit:** Includes gear, sprocket, worm gear, grease & bearings for seamless replacement
- • **DIY-Friendly Installation:** Detailed video guides make complex repairs approachable and time-saving
- • **Engineered for Durability:** High-quality components reduce wear and extend your garage door opener’s lifespan

## Overview

This Replacement Gear and Sprocket Kit is a comprehensive solution designed for 1/3 and 1/2 HP chain drive garage door openers from Liftmaster, Chamberlain, Sears, and Craftsman. It includes all essential parts—gear, sprocket, worm gear, grease, and bearings—ensuring a precise fit and restoring smooth, reliable operation. Backed by clear video instructions, it empowers professionals and DIYers alike to confidently upgrade or repair their garage door openers, preventing costly downtime and enhancing home convenience.

## Description

Garage Stop for Liftmaster 41c4220a Gear and Sprocket Kit fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models, Liftmaster Replacement parts

Review: Some time saving tips - The product itself was great, but there are some ways to go wrong that aren't covered in most instructional videos. The installation on my Chamberlain 1255LM was fairly straightforward except for the one screw that you can't get a straight shot at. The best tool for that screw is a 1/4" ratchet. You need to watch at least one video so you can see how to pull the little tab at the bottom that holds the lower gear on. Tip 1: Before you do anything, check the balance of the door. When it's disconnected, you should be able to lift it about halfway and have is stay there when you let go of it (catch it if it drops, or you might break a window). If it's not balanced, the tension on the springs need adjustment. This is not too difficult, but it's fairly dangerous, especially if your springs are old, so you might want to bring in a pro. I did mine after watching a video. I bought two 2-foot pieces of rebar and ground down the ends on a bench grinder, just enough so that they fit snugly in the holes of the adjusting clamp. For safety, they need to go in all the way and you should never be in front of them or the spring when making the adjustment. Tip2: At the motor end, put a mark the angle iron and the chain, so you can put the chain back where it was. I don't know what to use for the mark. I used a yellow grease pencil and a piece of blue painters tape, but by the time I got the chain on, the tape had moved and the mark on the chain was gone. It might have worked better if I put a mark at both ends. I was close, but had to do a little adjusting of the Up and Down screws on the side of the unit. Tip 3: When you take the chain off. Hook it on the motor end of the angle iron that runs from the motor to the beam over the door. Tip 3: The the bottom gear of the kit meshes with a small gear to the right of it. That gear tells the system where to stop based on the two up and down adjusting screws on the side of the unit. If there's a gap between the two gears, the motor won't know when to stop. The gap is there because the black plastic housing for the gear on the right has come loose. It snaps in. Make sure it's tight and the gears are in contact with each other. Tip 4: This is the big one. When your gear stripped. The door was likely either all the way up or all the way down. The control unit may be confused about which one it is. On mine, when I reconnected the chain, the door came up and jammed into the stop bolt near the motor. The control unit thought the door was down, so when I pressed the button the door tried to continue going up, then either clicked, hummed, or did nothing (because it was overheated). Here's how to avoid that. While the chain is off. Run the door (it won't move because the chain is off). Watch the big white gear (the one that stripped). Look at the gear from below. When it stops, you can press the button again and it will reverse direction. When it's rotating counter-clockwise, it thinks the door is going down. Clockwise, it thinks the door is going up. Look where the trolley is (the thing on the chain that connects to the bracket on the door). If the trolley is near the motor, make the gear go counter-clockwise until it stops. Then lift up the door until it snaps into the trolley. If it's at the far end, away from the motor. Do the opposite. Make the gear rotate clockwise until it stops. Then move the door until it snaps in. Then put the chain back on. Tighten it so that the middle of the chain is about 1/2" above the angle iron. It was likely too loose, which is what made the gear strip. Get the lock nut as tight as you can. If the chain not exactly where it was before you took it off, you may have to adjust the up and down screws on the side of the unit. The arrows show which way to turn the screw for more or less travel. Adjust the up screw until the door stops about 4-6" from the stop bolt. Then adjust the down screw until the door just hits the floor.
Review: Fit perfectly. My garage door opener works again! - This gear and sprocket assembly worked great. It took some time to replace all of the parts, but it was well worth it. I now have an operating garage door opener again. Tip: If you're doing this for the first time, watch a couple YouTube videos on how to replace this assembly. There are a couple of professionals who made videos about the process. They really helped. Last but not least, a number or reviewers complained that the holes in the top plate were not threaded. That's by design. The hole is sized for a #10 screw, but your opener could have been built using, for example, a #10-32 or a #10-24 screw. The non-tapped hole accommodates both. The screws are self-threading. Just run your screw through before installation... simple as that. I did mine by hand with a nut driver. A drill would be much quicker.

## Features

- Kit includes gear and sprocket, worm gear, grease, motor shaft bearings & sprocket bearings
- Compatible with chamberlain, sears, craftsman and lift master 1/3 and 1/2 HP chain drive models, replacement parts
- Compatible with chain drive chamberlain sears craftsman operators 1984-current
- video installation instructions provided
- 1-Pack

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07Y3XXJYM |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #162,578 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Garage Door Gears |
| Customer Reviews | 4.7 4.7 out of 5 stars (963) |
| Date First Available | September 19, 2019 |
| Included Components | Gear and sprocket, worm gear, grease, motor shaft bearings, sprocket bearings |
| Item Package Quantity | 1 |
| Item Weight | 1 pounds |
| Item model number | 59251-548 |
| Manufacturer | Garage Stop |
| Number of Pieces | 1 |
| Part Number | 59251-548 |
| Product Dimensions | 6.1 x 4.7 x 4.6 inches |
| Recommended Uses For Product | Residential garage doors |
| Special Features | Ergonomic |
| Style | One |
| UPC | 880160734218 |

## Product Details

- **Brand:** GARAGE STOP
- **Color:** Multicolor
- **Installation Type:** Screw-In
- **Item Weight:** 16 ounces
- **Material:** Metal

## Images

![Replacement for Liftmaster 41C4220A Gear and Sprocket Kit fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models - Image 1](https://m.media-amazon.com/images/I/71NwexzZa+L.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Will these parts fit model 139.53970srt?**
A: You have to go by the model number to make sure

**Q: Will theses parts fit model 139.53910D**
A: Yes.

**Q: Will this fit model139.53637srt**
A: Looking looking up the page in your owner's manual shows the part's list and it lists this part as working in your garage door opener

**Q: I have a chamberlain liftmaster  part number 41a5483b from 2003. will this part work?**
A: Me too! And yes, it works great. The part number you reference appears to be the logic board on the back of the unit. On the front, chain side, is the name plate with the model number. Mine is model 2265R and if yours is also a 2265-ish, this replacement works great.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Some time saving tips
*by B***. on September 16, 2023*

The product itself was great, but there are some ways to go wrong that aren't covered in most instructional videos. The installation on my Chamberlain 1255LM was fairly straightforward except for the one screw that you can't get a straight shot at. The best tool for that screw is a 1/4" ratchet. You need to watch at least one video so you can see how to pull the little tab at the bottom that holds the lower gear on. Tip 1: Before you do anything, check the balance of the door. When it's disconnected, you should be able to lift it about halfway and have is stay there when you let go of it (catch it if it drops, or you might break a window). If it's not balanced, the tension on the springs need adjustment. This is not too difficult, but it's fairly dangerous, especially if your springs are old, so you might want to bring in a pro. I did mine after watching a video. I bought two 2-foot pieces of rebar and ground down the ends on a bench grinder, just enough so that they fit snugly in the holes of the adjusting clamp. For safety, they need to go in all the way and you should never be in front of them or the spring when making the adjustment. Tip2: At the motor end, put a mark the angle iron and the chain, so you can put the chain back where it was. I don't know what to use for the mark. I used a yellow grease pencil and a piece of blue painters tape, but by the time I got the chain on, the tape had moved and the mark on the chain was gone. It might have worked better if I put a mark at both ends. I was close, but had to do a little adjusting of the Up and Down screws on the side of the unit. Tip 3: When you take the chain off. Hook it on the motor end of the angle iron that runs from the motor to the beam over the door. Tip 3: The the bottom gear of the kit meshes with a small gear to the right of it. That gear tells the system where to stop based on the two up and down adjusting screws on the side of the unit. If there's a gap between the two gears, the motor won't know when to stop. The gap is there because the black plastic housing for the gear on the right has come loose. It snaps in. Make sure it's tight and the gears are in contact with each other. Tip 4: This is the big one. When your gear stripped. The door was likely either all the way up or all the way down. The control unit may be confused about which one it is. On mine, when I reconnected the chain, the door came up and jammed into the stop bolt near the motor. The control unit thought the door was down, so when I pressed the button the door tried to continue going up, then either clicked, hummed, or did nothing (because it was overheated). Here's how to avoid that. While the chain is off. Run the door (it won't move because the chain is off). Watch the big white gear (the one that stripped). Look at the gear from below. When it stops, you can press the button again and it will reverse direction. When it's rotating counter-clockwise, it thinks the door is going down. Clockwise, it thinks the door is going up. Look where the trolley is (the thing on the chain that connects to the bracket on the door). If the trolley is near the motor, make the gear go counter-clockwise until it stops. Then lift up the door until it snaps into the trolley. If it's at the far end, away from the motor. Do the opposite. Make the gear rotate clockwise until it stops. Then move the door until it snaps in. Then put the chain back on. Tighten it so that the middle of the chain is about 1/2" above the angle iron. It was likely too loose, which is what made the gear strip. Get the lock nut as tight as you can. If the chain not exactly where it was before you took it off, you may have to adjust the up and down screws on the side of the unit. The arrows show which way to turn the screw for more or less travel. Adjust the up screw until the door stops about 4-6" from the stop bolt. Then adjust the down screw until the door just hits the floor.

### ⭐⭐⭐⭐⭐ Fit perfectly. My garage door opener works again!
*by M***D on October 8, 2023*

This gear and sprocket assembly worked great. It took some time to replace all of the parts, but it was well worth it. I now have an operating garage door opener again. Tip: If you're doing this for the first time, watch a couple YouTube videos on how to replace this assembly. There are a couple of professionals who made videos about the process. They really helped. Last but not least, a number or reviewers complained that the holes in the top plate were not threaded. That's by design. The hole is sized for a #10 screw, but your opener could have been built using, for example, a #10-32 or a #10-24 screw. The non-tapped hole accommodates both. The screws are self-threading. Just run your screw through before installation... simple as that. I did mine by hand with a nut driver. A drill would be much quicker.

### ⭐⭐⭐⭐⭐ Saved hundreds fixing a decade's old opener.
*by C***C on September 2, 2025*

If you watch the right video, switching out this part is easy with this kit. I saved hundreds of dollars and even fixed the root problem that stripped the old gear, in a garage door opener from the 1990's.

## Frequently Bought Together

- Garage Stop for Liftmaster 41c4220a Gear and Sprocket Kit fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models, Liftmaster Replacement Parts
- LIFTMASTER Garage Door Openers 31D380 Chain Drive Sprocket Cover
- Replacement for Liftmaster 41c4220a Gear and Sprocket Kit fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-17*