LiftMaster K15-5032 50B32T Sprocket for BG790 Barrier Gate Operators
The LiftMaster K15-5032 is a heavy sprocket used in BG790 barrier gate operator drive applications. Barrier operators place repeated load on the drive assembly as the arm starts, stops, balances, and cycles throughout the day. A worn sprocket can show hooked teeth, excessive chain slack, abnormal noise, or inconsistent barrier arm movement.
This part is identified by its 50B32T sprocket style, 1-1/2 inch bore, and 1/2 inch keyway. Those dimensions matter. A sprocket with a similar chain size but different bore, keyway, or hub can create misalignment or fail to lock properly on the shaft. For BG790 service work, inspect the chain, bearings, counterweight setup, and related pulleys at the same time.
Compatible With
- LiftMaster BG790 barrier gate operators
- BG790 barrier arm drive assemblies that call for K15-5032
- Applications requiring a 50B32T sprocket with 1-1/2 inch bore and 1/2 inch keyway
- Not confirmed as a universal BG770 or slide/swing gate sprocket without parts diagram verification
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Sprocket |
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| Part Number | K15-5032 |
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| Sprocket Size | 50B32T |
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| Bore / Keyway | 1-1/2 inch bore with 1/2 inch keyway |
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| Application | BG790 barrier gate drive assembly |
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| Compatible Operator Type | Barrier gate operator |
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| Notes | Heavy chain-drive sprocket; verify shaft and diagram location |
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Also Known As / Related Part Numbers
- K15-5032
- 15-5032
- G155032
- 155032
- 50B32T
- LM-K15-5032
- BG790 sprocket
Technician Note
Mechanical drive parts usually fail because of wear, misalignment, loose hardware, poor chain or belt tension, or a worn supporting shaft/bearing. Correct the cause of wear before installing the replacement part.
Before Ordering
- Confirm the installed operator is BG790 or diagram-supported equivalent
- Match bore, keyway, chain size, and tooth count
- Inspect the chain and shaft before installation
- Check barrier arm balance and counterweight condition if the sprocket wore prematurely
Professional Advisory
Gate and barrier operators can move heavy equipment and may contain high-voltage circuits. Disconnect power according to the operator manual and use a qualified gate technician for electrical diagnosis, unsafe movement, or commercial operator service work.
Important Ordering Warnings
- Similar LiftMaster sprockets, belts, pulleys, and retaining clips are not always interchangeable
- Model suffixes and operator generations can change the correct service part
- Do not bypass entrapment protection, guards, covers, or safety devices during service
- If the drive assembly is badly worn, inspect the mating chain, belt, shaft, bearing, key, and hardware before returning the operator to service
Product Questions & Answers
What is K15-5032 used for?
K15-5032 is a LiftMaster replacement sprocket used in the drive or retaining assembly described on this product page. It should be matched to the operator parts diagram and original part number.
How do I know if this sprocket is the correct replacement?
Confirm the original part number, operator model, diagram location, and physical dimensions. For drive parts, also compare chain or belt size, bore, keyway, tooth count, pulley diameter, or retaining groove as applicable.
Can I replace this part based only on the product photo?
No. Many LiftMaster mechanical service parts look similar but differ by bore, keyway, tooth count, diameter, offset, belt profile, or operator generation.
What symptoms can point to a worn sprocket?
Common signs include rough movement, chain or belt slip, noise, vibration, worn teeth or grooves, loose fit on the shaft, damaged retaining hardware, or inconsistent gate travel.
What else should be checked during replacement?
Inspect the mating chain or belt, shaft, bearings, keys, set screws, guards, covers, and overall alignment. On powered gate equipment, use safe service procedures and a qualified technician when needed.
