The LiftMaster 41A5585-1 is a complete gear and sprocket repair kit for select 3/4 HP LiftMaster and Chamberlain chain drive garage door openers. It is used when the internal drive gear or sprocket assembly has worn, stripped, or failed.
This kit helps restore the opener drive system by replacing the main wear components that transfer motor power to the chain. It is commonly used when the opener motor runs but the door does not travel, or when gear shavings are found inside the opener housing.
Compatible With
The 41A5585-1 is commonly used with various 3/4 HP chain drive openers. Compatibility should be confirmed by the opener model, original gear kit number, and parts diagram.
Common Compatible Models and Families
- Select LiftMaster 2575 and 2575C openers
- Select LiftMaster 3275 and 3275C openers
- Select LiftMaster 3575, 3575C, and 3575S openers
- Select Chamberlain 3/4 HP chain drive openers
- Select Sears Craftsman 3/4 HP Chamberlain-built chain drive units
Important Compatibility Notes
- This kit is for select 3/4 HP chain drive openers
- Not a universal gear kit for all LiftMaster models
- Do not confuse with 41C4220A 1/2 HP gear kits
- Match the original gear kit, sprocket layout, and model diagram
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain |
| Product Type | Gear and sprocket replacement kit |
| Part Number | 41A5585-1 / 041A5585-1 |
| Application | 3/4 HP chain drive gear repair |
| Compatible Operator Type | Select LiftMaster and Chamberlain 3/4 HP chain drive garage door openers |
| Includes | Helical gear and top hat assembly, worm gear, wear bushings, grease, and repair hardware |
| Notes | Confirm horsepower and model-specific parts diagram |
Also Known As / Related Part Numbers
This part may be searched under related LiftMaster, Chamberlain, or older catalog number formats. Related numbers should be verified against the opener parts diagram before treating them as exact replacements.
Technician Note
Inspect the failed gear before installing the new kit. If the door is too heavy, the chain is over-tightened, or the rail/trolley is binding, the new gear kit can fail early.
Before Ordering, Confirm
- The opener is a 3/4 HP chain drive model
- The original kit number is 41A5585-1, 041A5585-1, or a confirmed related number
- The model family appears on the replacement parts diagram
- The door is properly balanced
- The chain, trolley, and rail are not binding
Professional Advisory
Disconnect power before service. Gear kit replacement involves opening the motor head and working around the drive system; use a qualified technician if there is any concern about electrical parts, spring balance, or safe door operation.
Important Ordering Warnings
- Do not install on incompatible 1/2 HP or 1/3 HP units
- Gear failure can be a symptom of a door problem
- White shavings identify gear wear, not the exact part number
- Some older Chamberlain-built units have similar but non-interchangeable kits
- Always verify model and diagram
Questions & Answers
What is included with the 41A5585-1 kit?
The 41A5585-1 kit is commonly listed as a complete 3/4 HP gear and sprocket replacement kit with helical gear, top hat assembly, worm gear, wear bushings, grease, and hardware.
How is 41A5585-1 different from 41A5585?
The numbers are closely related 3/4 HP gear kit references, but the current kit contents and replacement listing should be matched to the opener diagram and inventory label.
Can this kit repair a stripped gear?
Yes. It is used to repair stripped or worn drive gears on select 3/4 HP chain drive openers when the opener model calls for this kit.
Will it fit Chamberlain or Craftsman openers?
It may fit select Chamberlain and Sears Craftsman 3/4 HP chain drive openers built by Chamberlain, but model and parts diagram confirmation is required.
Why did the gear fail?
Common causes include normal wear, a heavy or unbalanced door, over-tight chain tension, rail bind, or a worn trolley or sprocket assembly.
