Genuine LiftMaster 1707LM one-piece chain-drive rail assembly for 7 ft doors (LiftMaster G1707) — the full-length T-rail with the trolley and chain / cable assembly that LiftMaster supplies with its professional chain-drive heads, as one straight 7 ft section instead of the three-piece rail in a retail box. Fit it to a new head, or re-rail an opener whose rail is bent, rusted or worn where the trolley runs. 8 ft and 10 ft doors take the 1708LM and 1710LM.
Chain or rail? If the rail is straight and the trolley runs clean, a worn or broken chain only needs the chain and cable assembly: 041D3484 for a 7 ft door (041D3483 8 ft, 041D3485 10 ft). Order the rail assembly when the rail itself is damaged or you are installing a head that came without one.
Specifications
| Part number | 1707LM / G1707 (also MR1707LM, 1707AC, MR1707AC, 1707PL; UPC 012381170777) |
|---|---|
| Door height | Up to 7 ft |
| Type | One-piece T-rail, chain drive, with trolley and chain / cable assembly |
| Fits | LiftMaster, Chamberlain and Craftsman AC and DC chain-drive openers that use the T-rail — list below |
| Length | About 10 ft 5 in packed — ships as an oversize item |
| Condition | Genuine LiftMaster, new |
Fits
| Opener | Rail |
|---|---|
| Security+ 3.0 chain drive: 2220L, 2420L, 2100L, 2300L | 1707LM (7 ft door) |
| Security+ 2.0 chain drive: 81602, 81600, 81650, 81640, 81550, 83650, 84602, 8164W, 8160W, 8165W, 8365W-267 | 1707LM |
| Security+ chain drive: 8165, 8365, 8360, 8075, 8065, 2265 / 3265, 2565, 2575, 3575, 2595, 3595 | 1707LM |
| Older chain drive: 1345 / 1346 / 1355 / 1356, 1240, 1245, 1246, 1250, 1255, 1256, 1260, 1265, 2245, 2255, 3245, 3255, 215WD, 220WD, 315WD, 320WD | 1707LM |
| 8 ft door | 1708LM |
| 10 ft door | 1710LM |
| Belt drive | 2777BD (7 ft), 2778BD (8 ft), 2770BD (10 ft) — not this rail |
| I-beam rail heavy-duty chain (4690L, 8587, 8500 series) | 3707CH / 3708CH / 3710CH — not this rail |
Common questions
Is the chain included?
The rail assembly comes with the trolley and chain / cable assembly fitted, ready to hang. If yours arrives without chain, call us before you install.
One piece or three?
One straight 7 ft section. It is stiffer and quieter than a sectional rail but has to ship as an oversize parcel, which is why the shipping line at checkout is what it is.
Does it fit a belt-drive head?
No. Belt-drive heads take the belt rail (2777BD series); the sprocket and trolley are different.
Related
041D3484 chain 7 ft · 1708LM 8 ft rail · 1710LM 10 ft rail · 2777BD belt rail · 8165 parts · 81602 parts
Not sure whether you need the rail or just the chain? Send a photo of the rail and the opener model to parts@gatehousesupplies.com or call 866-965-5599. We would rather confirm it than have you order twice.
![Liftmaster 2777BD Belt drive rail assembly 7 foot [G2777]](https://cdn11.bigcommerce.com/s-32eq2wsbti/images/stencil/500x659/products/11474/228109/liftmaster-2777bd-belt-drive-rail-assembly-7-foot-g2777-2777bd__79179.1721408628.jpg?c=2 "Liftmaster 2777BD Belt drive rail assembly 7 foot [G2777]")
