Liftmaster 041A5658-1, DUAL GEAR AND SPROCKET KIT
The LiftMaster 041A5658-1 is a dual gear and sprocket replacement kit for select 3/4 HP AC chain drive opener heads. This kit repairs the internal drive gear section that turns motor output into chain movement. When the gear assembly wears or strips, the opener may sound like it is running but the chain will not pull the trolley correctly.
This part is often tied to higher-load residential chain drive units and should be matched by model, suffix, and parts diagram. It is not a general-purpose gear set for every LiftMaster chain opener. The dual gear style, horsepower rating, and opener generation all matter for correct fitment.
Compatible With
- Select 3/4 HP LiftMaster AC chain drive garage door openers using 041A5658-1
- Select LiftMaster 8587, 8587W, 8587WL, and 85870 style 3/4 HP AC chain drive references when confirmed by parts diagram
- Select 8587MC / 8587WMC references where the original diagram lists this kit
- Various LiftMaster 3/4 HP AC chain drive opener models that list the matching dual gear kit
Features & Specifications
| Manufacturer | LiftMaster / Chamberlain Group |
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| Product Type | Dual gear and sprocket replacement kit |
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| Part Number | 041A5658-1 |
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| Application | 3/4 HP AC chain drive opener gear repair |
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| Compatible Operator Type | Select AC chain drive garage door openers |
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| Included Components | Helical gear and top hat assembly, worm gear, wear bushings, grease, and hardware |
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Also Known As / Related Part Numbers
Technician Note
This kit is commonly confused with 041A5658. Use the suffix exactly as shown in the parts diagram, especially on 3/4 HP chain drive operators with different sprocket or gear assemblies.
Before Ordering
- Confirm the full part number includes the -1 suffix
- Verify the opener is a compatible 3/4 HP AC chain drive model
- Inspect door balance and rail/trolley movement
- Compare the old gear assembly and sprocket style before installation
Important Ordering Warnings
- Do not use as a universal replacement for every LiftMaster chain drive opener
- Do not substitute for 041A5658 unless the parts diagram supports it
- Do not install without correcting chain tension or door balance problems
- Disconnect power before opening the motor head
Professional Advisory
A gear repair is only reliable if the opener is not being overloaded. If the door is heavy, noisy, or binding, have the door system serviced before installing this replacement kit.
Product Questions & Answers
What is different about the 041A5658-1 kit?
It is a dual gear and sprocket kit for select 3/4 HP AC chain drive opener models, not a universal gear set.
Can this replace 041A5658?
Only if the opener parts diagram confirms the substitution. The two numbers are related but not automatically interchangeable.
Which models are often searched with this kit?
Common references include 8587, 8587W, 8587WL, 85870, and related 3/4 HP AC chain drive models where confirmed by diagram.
What causes gear failure on these openers?
Age, heavy doors, chain tension problems, poor door balance, rail drag, or repeated force-limit stress can wear the gear assembly.
Does the opener need reprogramming after gear replacement?
Usually no remote programming is needed for a mechanical gear replacement, but travel and force settings should be checked after the repair.
