Liftmaster K75-50117 Sprocket and Chain Replacement Kit (Q057) Swing Gate Opener
The LiftMaster K75-50117 is a sprocket and chain replacement kit for select LiftMaster and Elite commercial swing gate operators. The kit is commonly referenced as Q057 and is used in the mechanical drive section where the operator transfers motor and gearbox movement to the swing gate output system.
This kit is typically replaced when the chain is stretched or damaged, the sprocket teeth are worn, the operator is noisy, or the drive system is slipping under load. Because these symptoms can also be caused by gate binding, gearbox wear, or improper adjustment, the full operator and gate movement should be checked before installing new drive parts.
Compatibility is focused on older commercial swing gate operators, especially CSW200 and ROBO SWING references manufactured before 2016. This is not a universal swing gate sprocket kit and should not be assumed to fit newer DC swing operator families without parts diagram confirmation.
Compatible With
Common Compatible Models
- LiftMaster CSW200 commercial swing gate operator
- LiftMaster CSW200U commercial swing gate operator
- LiftMaster CSW200UL commercial swing gate operator
- LiftMaster / Elite ROBO SWING operator
Additional Model Families to Verify
- Pre-2016 LiftMaster commercial swing gate operators that call for K75-50117 or Q057
- Compatible standard gearbox units in listed operators
- Compatible jumbo gearbox units in listed operators
Important Compatibility Notes
- Common listings specify commercial swing gate operators manufactured before 2016.
- Do not assume fitment on CSW24U or newer DC swing gate operators.
- Verify gearbox style and parts diagram before ordering.
- Inspect chain alignment, sprocket wear, and gearbox condition before replacement.
Also Known As / Related Part Numbers
- K75-50117
- LM-K75-50117
- Q057
- Elite Q057
- Sprocket and chain kit Q057
- CSW sprocket and chain kit
- Output shaft sprocket and chain kit
- LiftMaster K75 50117
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Sprocket and chain replacement kit |
| Part Number | K75-50117 |
| Alternate Reference | Q057 |
| Application | Commercial swing gate operator drive system |
| Common Compatible Models | CSW200, CSW200U, CSW200UL, ROBO SWING |
| Production Note | Commonly listed for operators manufactured before 2016 |
| Gearbox Note | Used with compatible standard or jumbo gearbox units where specified |
| Notes | Verify model generation and gearbox style before ordering |
Technician Note
Do not install a new chain and sprocket kit on a gate that is binding or dragging. The drive parts will wear quickly if the gate cannot move freely by hand with the operator disconnected.
Before Ordering Checklist
- Confirm the operator model and approximate production generation.
- Verify the parts diagram calls for K75-50117 or Q057.
- Check whether the operator uses a standard or jumbo gearbox configuration.
- Inspect related sprockets, shafts, bearings, and chain alignment.
- Move the gate manually with the operator disconnected to check for hinge or gate drag.
Important Ordering Warnings
- Not assumed compatible with newer CSW24U/DC operator families.
- Pre-2016 compatibility is important for this kit.
- A stretched chain or worn sprocket may be a symptom of gate binding or gearbox problems.
Professional Advisory
Swing gate drive components can create pinch and crush hazards. Disconnect power, secure the gate, and release stored movement safely before service. A qualified gate technician should handle worn gearbox or heavy gate issues.
Product Questions & Answers
Which operators commonly use K75-50117?
K75-50117 is commonly listed for pre-2016 LiftMaster commercial swing gate operators including CSW200, CSW200U, CSW200UL, and ROBO SWING applications.
What is Q057?
Q057 is the Elite/LiftMaster alternate reference commonly associated with the K75-50117 sprocket and chain kit.
Does this kit work with standard and jumbo gearbox units?
Current listings commonly state that this kit is used with standard or jumbo gearbox units on compatible pre-2016 commercial swing gate operators.
Is K75-50117 for newer CSW24U operators?
Do not assume so. The common compatibility references are for older commercial swing gate operators manufactured before 2016. Newer DC operator families may use different parts.
What symptoms point to a worn sprocket and chain kit?
Symptoms can include chain skipping, uneven arm movement, noise from the gearbox area, worn sprocket teeth, or excessive slack after proper adjustment.
