Liftmaster K87-E-118, E-RING, IDLER SHAFT
The LiftMaster K87-E-118 is an E-ring retaining clip for idler shaft assemblies in compatible commercial slide gate operators. It fits into a shaft groove to keep the idler shaft hardware or related components in place while the chain and drive system operate under load.
This part is commonly replaced during idler shaft, chain, sprocket, or tensioning service. A loose or missing E-ring can let the shaft assembly shift, which may lead to chain tracking problems, abnormal wear, rattling, or loss of correct idler alignment. Since E-rings are groove-specific, it should not be substituted with a random clip that only looks similar.
Compatible With
Documented usage includes:
- LiftMaster SL595 Series commercial slide gate operators
- SL595U and related SL595 commercial/industrial slide gate references where the diagram lists this E-ring
- Various LiftMaster commercial slide gate operators using the same idler shaft E-ring
- Applications where K87-E-118, 87-E-118, 87E118, or G87E118 is shown in the replacement parts diagram
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | E-Ring / Retaining Clip |
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| Part Number | K87-E-118 |
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| Application | Idler shaft retention |
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| Compatible Operator Type | Select commercial slide gate operators |
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| Common Series | SL595 Series |
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| Notes | Confirm shaft groove and diagram location |
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Also Known As / Related Part Numbers
- K87-E-118
- 87-E-118
- 87E118
- G87E118
- Idler shaft E-ring
- E-ring retaining clip
Technician Note
If the E-ring is missing, check whether the idler shaft has side play or a worn groove. A new E-ring will not stay secure if the shaft groove is damaged or if the idler assembly is misaligned under chain load.
Before Ordering
- Confirm the operator is an SL595 Series or other listed commercial slide model
- Match K87-E-118 or a related reference in the parts diagram
- Inspect the shaft groove before installing a new E-ring
- Check the idler bolt, idler shaft, sprocket, chain, and bushings for wear
- Do not reuse a stretched or sprung E-ring
Professional Advisory
Commercial slide gate drive systems can be heavy and under chain tension. Disconnect power, secure the gate, and relieve mechanical tension safely before servicing idler components.
Important Ordering Warning
Do not assume all idler shaft E-rings are the same size. Confirm the LiftMaster part number and shaft groove before ordering.
Product Questions
Where is K87-E-118 used?
It is commonly used with LiftMaster SL595 Series commercial slide gate operators and various commercial slide gate operator idler shaft assemblies.
What does an idler shaft E-ring do?
It helps retain the idler shaft or related shaft-mounted components so the drive chain stays aligned.
Can a missing E-ring cause chain problems?
Yes. If the shaft or idler assembly shifts, the chain can track poorly, make noise, or wear surrounding parts.
Is K87-E-118 the same as K87-E-050?
No. They are different retaining clip references and should be matched to the exact parts diagram location.
Should I replace other idler parts at the same time?
Inspect the idler shaft, bolt, sprocket, bushings, chain, and tensioning hardware. Replace worn parts as needed.
