Liftmaster 31D380 Sprocket Cover
The LiftMaster 31D380 sprocket cover is a replacement cover for select LiftMaster and Chamberlain chain drive garage door openers. It is commonly referenced by the current service number K031D0380M and protects the sprocket area on compatible opener housings.
Common Application
This cover is commonly used on select chain drive opener housings. Retail model references often include chain drive families such as 3255, 3265, 1355, and 1345 when confirmed by parts diagram.
When This Part Is Usually Ordered
- Original sprocket cover is cracked, missing, or loose
- Cover was damaged during gear or sprocket service
- Opener parts diagram lists 31D380, 031D0380, 031D0380M, or K031D0380M
- Chain drive opener needs the sprocket area covered again
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain |
| Product Type | Sprocket cover |
| Part Number | 31D380 |
| Updated / Service Part Number | K031D0380M |
| Application | Select chain drive garage door opener housings |
| Compatible Operator Type | Select LiftMaster and Chamberlain chain drive openers |
| Drive Type | Chain drive |
| Common Model References | Select 3255, 3265, 1355, 1345-style applications when confirmed by parts diagram |
| Notes | Cover only; does not include sprocket, chain, or gear kit |
Also Known As / Related Part Numbers
Technician Note
If the sprocket cover is missing because the opener had gear or sprocket service, inspect for chain dust, gear shavings, loose hardware, or a worn sprocket before installing the replacement cover.
Before Ordering
- Confirm the opener is a compatible chain drive model
- Match the housing diagram to 31D380 or K031D0380M
- Inspect the sprocket and chain area before installing the cover
- Confirm the cover mounting points are intact
- Do not use the cover to hide a damaged sprocket or loose chain issue
Professional Advisory
Keep hands, tools, and loose items away from the sprocket and chain area. Disconnect power before any service and use a qualified technician for mechanical or electrical opener repairs.
Product Questions & Answers
Is 31D380 the same as K031D0380M?
Yes. K031D0380M is the updated service number commonly associated with the 31D380 sprocket cover.
What type of opener uses this cover?
It is used on select LiftMaster and Chamberlain chain drive garage door openers.
Does this part include the sprocket or gear kit?
No. This listing is for the sprocket cover only. Sprockets, gears, and chain hardware are separate parts.
Can I run the opener without the sprocket cover?
The opener may run, but missing covers can leave moving parts exposed and allow debris into the sprocket area. Replace the cover when the correct part is available.
What should I check while the cover is removed?
Inspect the sprocket, chain, gear area, housing tabs, and nearby hardware for wear or damage before installing the replacement cover.
