LiftMaster K15-50B18LKGH 50B18T Gear Reducer Sprocket for CSW24 Swing Gate Operators
The LiftMaster K15-50B18LKGH is a 50B18T gear reducer sprocket used in select LiftMaster CSW swing gate operator drive assemblies. This part helps transfer torque from the gear reducer into the chain-driven section of the operator. When the sprocket is worn or loose, the gate may move unevenly, bind under load, make grinding noises, or show chain tracking problems.
This sprocket is commonly listed with set screw, key, and slot-lock keyway references depending on supplier description. The strongest specific model support is for CSW24UL, CSW24V, and CSW24VDC, with CSW24U and CSW24ULMC appearing in related compatibility listings. Because suffixes can represent different revisions or packages, use the parts diagram for the installed unit before assuming interchange.
Compatible With
- LiftMaster CSW24UL commercial swing gate operators
- LiftMaster CSW24V commercial swing gate operators
- LiftMaster CSW24VDC commercial swing gate operators
- Select CSW24U / CSW24ULMC applications when confirmed by parts diagram
- Various LiftMaster swing gate operators using the matching 50B18T sprocket
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Gear reducer sprocket |
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| Part Number | K15-50B18LKGH |
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| Sprocket Size | 50B18T |
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| Chain Size Compatibility | #50 roller chain |
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| Application | CSW swing gate operator drive assembly |
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| Compatible Operator Type | Commercial swing gate operator |
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| Notes | Often referenced with slot-lock keyway, set screws, and key |
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Also Known As / Related Part Numbers
- K15-50B18LKGH
- 15-50B18LKGH
- 50B18T
- 50B18
- LM-K15-50B18LKGH
- CSW24 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 CSW24 model suffix and parts diagram
- Compare bore, hub, keyway, tooth count, and chain alignment
- Inspect the chain, gear reducer shaft, key, and set screws
- Do not confuse this 18T sprocket with 16T or 32T #50 sprockets
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 K15-50B18LKGH used for?
K15-50B18LKGH 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.
