Liftmaster 041A5250-1, BELT KIT, 8'
The LiftMaster 041A5250-1 belt kit is the full belt assembly used in select residential belt drive opener rail systems for a 8 ft high residential garage door. The belt wraps through the rail and engages the opener drive sprocket so the motor can pull the trolley smoothly and quietly. A worn belt can show up as clicking, slipping, uneven movement, a door that will not complete travel, or visible cracking along the belt ribs. Door height and rail length are critical on these kits. The opener model may be similar to another belt drive opener, but the wrong belt length can make proper tension and limit adjustment impossible. This kit should be selected by the original belt part number, door height, and opener parts diagram.
Compatible With
Common Compatible Applications
- Select LiftMaster residential belt drive garage door openers using a 8 ft belt assembly
- Select Chamberlain residential belt drive garage door openers using a 8 ft rail system
- Select Craftsman belt drive openers built by Chamberlain Group when the parts diagram lists 041A5250-1 or related formats
- Residential belt drive opener installations for a 8 ft high residential garage door
Important Compatibility Notes
- Not for chain drive openers
- Not for screw drive openers
- Do not substitute this 8 ft belt for a different door height unless the manual confirms the same belt part number
- Verify rail style and trolley style before ordering
Features and Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain Group |
| Product Type | One-piece belt assembly kit |
| Part Number | 041A5250-1 |
| Door Height Application | 8 ft |
| Application | Residential belt drive opener rail assembly |
| Compatible Operator Type | Select LiftMaster, Chamberlain, and Craftsman belt drive garage door openers |
| Drive Type | Belt drive |
| Notes | Length-specific belt assembly; verify by parts diagram |
Also Known As / Related Part Numbers
- 041A5250-1
- 41A5250-1
- 1A5250-1
- LM-041A5250-1
- Belt kit 8 ft
- Full belt assembly 8 ft
Technician Note
Before replacing a belt, inspect the sprocket, trolley, belt cap retainer, and rail alignment. A damaged sprocket or binding door can ruin a new belt quickly.
Before Ordering Checklist
- Confirm the opener is a belt drive model
- Confirm the garage door height and rail setup are 8 ft
- Check the original belt part number in the manual or on the parts diagram
- Inspect the belt teeth and drive sprocket for matching wear
- Do not mix belt kits from different door-height rail systems
Professional Advisory
Unplug the opener before servicing the belt and rail. If the garage door is heavy, uneven, or will not stay balanced by hand, have the door repaired before installing a new belt kit.
Product Questions and Answers
What door height is 041A5250-1 used for?
It is used for select belt drive opener rail systems set up for a 8 ft high residential garage door.
Can this belt kit replace a chain and cable kit?
No. This is only for belt drive openers. Chain drive openers use a different chain and cable assembly.
Why does belt length matter?
The belt length must match the rail and door height so the trolley can travel correctly and the belt can be tensioned properly.
What are signs that the belt should be replaced?
Visible belt damage, missing teeth, slipping, excessive rail noise, or a trolley that will not move smoothly can point to a worn belt assembly.
Is 41A5250-1 related to 041A5250-1?
Yes. LiftMaster belt parts are often searched with and without the leading zero, so 41A5250-1 is a related format for 041A5250-1.
