LiftMaster 41A4813 Chain Pulley Bracket Kit
The LiftMaster 41A4813 is a chain pulley bracket replacement kit for select LiftMaster and Chamberlain chain drive garage door openers that use a T-rail. It replaces the front rail pulley/bracket assembly that guides the chain at the header end of the opener rail.
Common Applications
- Front chain pulley bracket replacement on compatible T-rail chain drive openers
- Repairs involving worn pulley wheel, bent bracket, loose pin, or noisy front rail movement
- LiftMaster and Chamberlain chain drive models that list 041A4813 / 41A4813
- Service work where chain tracking or front pulley wear is the problem
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain Group |
| Product Type | Chain pulley bracket kit |
| Part Number | 41A4813 |
| Current Format | 041A4813 |
| Related Part Numbers | 041A3420, 41A3420, 41B4813 |
| Application | Front pulley bracket for T-rail chain drive openers |
| Compatible Operator Type | Select chain drive garage door openers with T-rail |
| Rail Compatibility | T-rail applications only when confirmed by parts diagram |
Also Known As / Related Part Numbers
- 041A4813
- 41A4813
- 041A3420
- 41A3420
- 41B4813
- Front chain pulley bracket
Technician Note
This is a rail-style-sensitive part. Before ordering, confirm the opener uses a T-rail chain drive assembly and not a square rail, belt rail, or screw drive rail.
Before Ordering
- Confirm the opener is a chain drive model with a compatible T-rail.
- Match 041A4813, 41A4813, 041A3420, 41A3420, or 41B4813 in the parts diagram.
- Inspect chain tension and chain condition before replacing the bracket.
- Check the trolley and rail for wear that may have caused pulley damage.
- Do not use this bracket on belt drive or screw drive rail systems.
Professional Advisory
Unplug the opener before servicing rail and chain parts. Do not run a garage door opener with a loose chain, bent front bracket, or failing pulley because the chain can derail or damage the rail assembly.
Product Questions & Answers
What does the 41A4813 chain pulley bracket do?
It supports the front idler pulley on compatible T-rail chain drive openers and helps guide the chain along the rail.
Does 41A4813 fit all LiftMaster chain drive openers?
No. It is for select chain drive openers with T-rail assemblies. Always confirm by parts diagram.
Is 41A4813 related to 41A3420?
Yes. 041A3420, 41A3420, and 41B4813 are commonly listed as related numbers for this bracket kit.
What are signs the pulley bracket may be worn?
Grinding at the rail end, chain droop, poor chain tracking, visible pulley wear, or a bent bracket can point to this assembly.
Should chain tension be adjusted after replacement?
Yes. Chain tension and rail alignment should be checked after replacing a front pulley bracket.
