LiftMaster Q013 / K75-50090 Gate Operator Idler Pulley with Hardware
LiftMaster Q013 / K75-50090 Gate Operator Idler Pulley with Hardware
The LiftMaster Q013 is a replacement idler pulley with hardware for compatible gate-operator drive systems. The supplied catalog identifies K75-50090 as the manufacturer part number for this Q013 item. The CSL24U repair-parts diagram identifies Q013 as an idler pulley with hardware. Match the exact operator configuration and mounting location before ordering, and have the surrounding chain path and drive components inspected so a new idler does not leave an underlying alignment or wear problem unresolved.
Compatibility — Models, Versions and Exclusions
| Model or selection point | Compatibility requirement |
|---|---|
| Q013 | Supplier item reference for the idler pulley with hardware. |
| K75-50090 | Manufacturer cross-reference recorded in the supplier catalog. |
| CSL24U | The manufacturer parts diagram identifies Q013; confirm the exact operator configuration. |
| Other slide-gate models | Require their own parts-diagram confirmation. |
| Drive sprocket / belt pulley | A different component function; do not select by the word pulley alone. |
Identify the Idler’s Location Before Ordering
A gate drive can contain several rotating components with different functions. Identify which assembly is being replaced and photograph its position relative to the chain and operator. A close-up of an unlabelled loose pulley is less useful than a photograph showing the installed mounting arrangement and the complete operator label.
Noise, chain misalignment or uneven movement do not prove that the idler alone is faulty. Have the technician inspect the chain path, adjacent drive components and mounting support. If another component has caused the idler to wear, that underlying condition must also be addressed. The product reference establishes the intended service assembly; it does not diagnose the installation.
Specifications
| Specification | Details |
|---|---|
| Supplier SKU | Q013 |
| Manufacturer part number | K75-50090 |
| Component | Idler pulley with hardware |
| Documented application example | LiftMaster CSL24U slide-gate operator |
| Ordering requirement | Match the operator parts diagram and original assembly |
When This Part Is Used
An idler guides the drive system along its intended path. A worn, damaged or seized pulley can require replacement, but the complete drive should be inspected before deciding which component is responsible for noise or irregular movement.
LiftMaster’s CSL24U repair-parts diagram identifies Q013 as the idler pulley with hardware. Confirm the diagram for the exact operator generation rather than assuming that every slide-gate operator uses the same assembly.
Before Ordering
- Compare the complete operator model and original pulley reference.
- Check the mounting location and hardware arrangement.
- Inspect the chain path, adjacent components and mounting support.
- Confirm that the required part is the idler assembly rather than a drive sprocket or belt pulley.
Frequently Asked Questions
Why does the listing use both Q013 and K75-50090?
Q013 is the supplier item reference, and K75-50090 is its listed manufacturer part number.
Is mounting hardware included?
The supplier describes this item as an idler pulley with hardware. Confirm any application-specific additional fasteners against the operator parts diagram.
Safety Warnings — Read Before Installation or Service
- WARNING: A moving gate and exposed chain drive can cause crushing, pinching or entanglement injuries. Keep hands and tools away from the drive while it can move.
- Disconnect all operator power, including batteries where fitted, and secure the gate before service.
- Do not test a pulley by reaching into an energized chain path or pulling the gate against an unsecured drive assembly.
- After repair, have the technician verify the chain path and retention, reinstall required guards and complete operational and entrapment-protection tests.
Related Products and Important Differences
- LMRRUL monitored photo eye — a separate safety device to assess against the exact gate-operator manual during the post-repair safety review. It is not part of the idler kit.
- LMWEKITU monitored wireless edge kit — a related safety-system accessory where approved; neither this kit nor its edges replace a mechanical drive repair.
More Questions Before Ordering
Can I select an idler using only its outside diameter?
No. Mounting, hardware, chain path and the specified service reference must agree. Use the exact operator diagram rather than one measurement.
Does the hardware description include every nearby fastener?
The supplier calls this an idler with hardware. Confirm the kit inventory and any separately listed mounting parts; nearby components in an exploded drawing are not automatically included.
Need Help Confirming the Right Part?
Contact Garage-DoorParts.com before ordering. Send the full operator model, readable part labels and photographs of the installed assembly. Include dimensions or the control-box model where relevant. We can help compare the listing with the information you provide; final installation suitability should be confirmed by the servicing technician.
Details
Need Help With Compatibility?
Not sure if this is the correct part for your garage door, operator, gate system, or application? Contact Us before ordering — we’re happy to help.
Garage-DoorParts.com carries a large selection of residential and commercial parts, and many components can look similar while having important differences in dimensions, model numbers, voltage, mounting, or compatibility.
For the best assistance, please provide as much information as possible, including the manufacturer, model number, part number, door or operator type, dimensions, and clear photos of the existing part or equipment.
Our goal is to help you identify the correct product before you order and reduce the possibility of ordering an incompatible part.
Contact Us with your product questions and compatibility information, and we’ll do our best to point you in the right direction.
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