LiftMaster 15-80B9QGH Sprocket, 80B9, 1-1/4 Inch Bore x 1/4 Inch Keyway
The LiftMaster 15-80B9QGH is a replacement sprocket used in select GH commercial door operator drive systems. It is identified as an 80B9 sprocket with a 1-1/4 inch bore and 1/4 inch keyway, commonly tied to 3 HP GH parts breakdowns where larger drivetrain components are used.
This sprocket should be ordered by exact part number and dimensions, not by appearance. GH operators can use multiple sprocket families depending on horsepower, ratio, and production generation, so the original sprocket and parts diagram should be checked closely.
What This Part Does
The sprocket carries drive chain load through the commercial operator drivetrain. It helps transfer output power from the gear reducer or shaft assembly to the connected chain path that moves the door system.
Worn teeth, a damaged keyway, wobble on the shaft, repeated chain slip, or abnormal chain noise can indicate sprocket or related drivetrain wear. The shaft, key, chain, bearings, and reducer should be inspected before and after replacement.
Compatible With
The 15-80B9QGH is commonly associated with select 3 HP LiftMaster GH commercial door operators and GH gearhead drive assemblies where the diagram specifies an 80B9 sprocket with 1-1/4 inch bore and 1/4 inch keyway.
Common Compatible Operator Families
- LiftMaster GH 3 HP industrial-duty commercial door operators
- Select Chamberlain/LiftMaster GH commercial operator equivalents
- Select GH Logic 4.0 3 HP drive assemblies
- Select GH Logic 5.0 3 HP drive assemblies
- Commercial gearhead operator drive systems calling for 15-80B9QGH
Fitment Details to Match
- 80B9 sprocket profile
- 1-1/4 inch bore
- 1/4 inch keyway
- 3 HP GH drive section where specified
- Shaft and chain alignment matching the original sprocket
Important Compatibility Notes
- This sprocket is not interchangeable with smaller-bore GH sprockets unless the parts diagram confirms it.
- Confirm 3 HP application and shaft size before ordering.
- Check shaft wear and key fit before installing a new sprocket.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Drive Sprocket |
| Part Number | 15-80B9QGH |
| Sprocket Type | 80B9 |
| Bore | 1-1/4 inch |
| Keyway | 1/4 inch |
| Horsepower Application | Commonly 3 HP GH |
| Compatible Operator Type | Select GH commercial door operators |
| Application | Commercial operator drivetrain chain drive section |
Also Known As / Related Part Numbers
This sprocket may be referenced by part number, sprocket type, or dimensional search terms.
- 15-80B9QGH
- K15-80B9QGH
- 1580B9QGH
- 80B9 sprocket
- 80B9 1-1/4 bore x 1/4 keyway
- LiftMaster GH 3 HP sprocket
- Related sprocket: K15-50B12PJH
- Related sprocket: K15-48B18QGH
Technician Note
Large GH sprockets should be checked with the chain and shaft. If the old sprocket has a wallowed keyway, the shaft keyseat may also be damaged.
A 3 HP GH drivetrain uses heavy torque. Make sure the door shaft, bearings, and brake are not creating extra load before returning the operator to service.
Before Ordering, Confirm
- Original sprocket part number or diagram calls for 15-80B9QGH.
- Operator is a compatible 3 HP GH gearhead commercial door operator.
- Bore is 1-1/4 inch and keyway is 1/4 inch.
- Chain size and tooth count match the original installation.
- Shaft key, set screw, and bearings are in usable condition.
Professional Advisory
These are commercial door operator mechanical or electrical brake parts. Disconnect power at the service disconnect before inspection or replacement and follow the operator manual for lockout, chain removal, brake adjustment, and return-to-service testing.
After installation, test the door only from a safe location with the opening in view. If the door is heavy, binding, out of balance, has damaged shafting, or does not stop correctly, have the system serviced by a qualified commercial door technician before normal use.
Important Ordering Warnings
- Do not use this sprocket based only on operator brand.
- Wrong bore or keyway may damage the shaft.
- A worn chain can damage a replacement sprocket quickly.
Questions & Answers
Where is the 15-80B9QGH sprocket used?
It is commonly used in select 3 HP LiftMaster GH commercial door operator drive assemblies where an 80B9 sprocket with a 1-1/4 inch bore is specified.
How is this different from K15-50B12PJH?
The 15-80B9QGH uses a different sprocket size and 1-1/4 inch bore. K15-50B12PJH is a different 50B12T sprocket with a 1-3/16 inch bore.
Can I replace only the sprocket?
Yes, if the shaft, key, chain, bearings, and mating sprockets are still good. If those parts are worn, they should be corrected too.
What should I measure before ordering?
Measure or verify the bore, keyway, chain size, tooth count, hub style, and compare the original part number to the parts diagram.
Why does sprocket alignment matter?
Poor alignment can cause chain jump, uneven wear, noise, shaft damage, and premature failure of the replacement sprocket.
