LiftMaster K13-32087 - RPM Interrupter Cup
The LiftMaster K13-32087 is an RPM interrupter cup used as part of the operator speed and movement feedback system. The cup works with the RPM sensor to help the control board see that the motor and drive system are turning as expected. On commercial gate and door equipment, this feedback is important because the operator uses RPM information for travel control, obstruction response, and fault detection. When the cup is cracked, out of position, missing, or worn, the operator may run briefly and stop, show RPM or movement-related errors, or fail to read travel properly. This is a small part, but it belongs in a critical sensing area, so matching the original K13-32087 part and verifying the operator diagram matters before replacing it.
Compatible With
Compatibility should be verified by the operator model, parts diagram, and original part number because LiftMaster mechanical and enclosure parts can vary by operator generation.
- Select LiftMaster commercial door operators using this RPM sensor cup
- Select LiftMaster commercial slide gate operators
- LiftMaster SL3000U and SL3000UL slide gate operators where shown in the parts diagram
- LiftMaster SL585U and SL585UL slide gate operators where shown in the parts diagram
- LiftMaster SL595U and SL595UL slide gate operators where shown in the parts diagram
- Various LiftMaster commercial operator electrical/control assemblies that list K13-32087
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | RPM interrupter cup |
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| Part Number | K13-32087 |
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| Application | RPM sensor feedback component |
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| Compatible Operator Type | Select commercial door and slide gate operators |
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| Notes | Works with the RPM sensor; verify by operator parts diagram |
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Also Known As / Related Part Numbers
- K13-32087
- 13-32087
- LiftMaster RPM Cup
- RPM Interrupter Cup
- RPM sensor cup
Technician Note
Inspect the sensor area before replacing the cup. A damaged RPM cup can be the symptom, but loose hardware, sensor misalignment, wiring trouble, or control-board faults can produce similar RPM errors.
Before Ordering
- Match the original part number to K13-32087.
- Confirm the operator model and generation.
- Inspect the RPM sensor, sensor bracket, and wiring at the same time.
- Do not substitute a similar-looking cup unless the parts diagram confirms it.
Professional Advisory
If the operator is reporting RPM faults or stopping unexpectedly, the complete sensing system should be checked by a qualified gate technician before returning the gate to normal service.
Important Ordering Warnings
- Do not bypass monitored safety or obstruction systems to work around an RPM-related fault.
Product Questions & Answers
What does the K13-32087 RPM cup do?
It gives the RPM sensor a physical reference so the operator can monitor motor and drive movement.
What symptoms can a bad RPM cup cause?
A damaged or missing cup may cause RPM faults, short run cycles, inconsistent travel, or failure to complete a gate cycle.
Does K13-32087 fit every LiftMaster slide gate operator?
No. It fits select commercial operator assemblies, so the operator parts diagram should confirm the part number.
Is this the RPM sensor itself?
No. K13-32087 is the interrupter cup, not the electronic RPM sensor or control board.
Should the RPM sensor be checked when replacing this cup?
Yes. Sensor position, wiring, and the cup condition should all be inspected together.
