LiftMaster K73-36109-1 Chassis Replacement Kit
The LiftMaster K73-36109-1 chassis replacement kit is a service frame used on select residential/light commercial swing gate operator platforms. It is most often associated with the RSW12UL family, with some listings also referencing related RSW12U, RSW12ULMC, CSW24U, and CSW24ULMC applications. The chassis holds the internal operator components in their proper positions and is important for arm alignment, cover fit, water management, and long-term mechanical stability. Because this part has several similar-looking chassis neighbors, correct fitment should come from the operator model label and exploded parts diagram.
For parts-counter accuracy, treat the part number as the primary identifier. LiftMaster gate operator service parts often share similar shapes, mounting points, and hardware names across several product generations, but small differences in shaft length, cabinet footprint, mounting holes, drive geometry, voltage platform, or operator family can make a similar part unusable. This replacement should be selected from the installed operator's model label and the correct exploded parts diagram, not from a general description alone.
Compatible With
LiftMaster RSW12UL is the strongest supported application. RSW12U, RSW12ULMC, CSW24U, and CSW24ULMC may be associated in some listings only when the installed parts diagram calls for K73-36109-1.
- RSW12UL residential/light commercial swing gate operators
- RSW12U / RSW12ULMC references when confirmed by diagram
- some CSW24U / CSW24ULMC references in supplier listings
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Chassis Replacement Kit |
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| Part Number | K73-36109-1 |
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| Application | Replacement service part for select LiftMaster gate operator assemblies |
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| Compatible Operator Type | Swing gate or slide gate operator, model dependent |
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| Compatible With | LiftMaster RSW12UL is the strongest supported application. RSW12U, RSW12ULMC, CSW24U, and CSW24ULMC may be associated in some listings only when the installed parts diagram calls for K73-36109-1. |
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| Included Components | Replacement chassis kit/frame. |
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| Notes | Do not assume K73-36109 and K73-36109-1 are interchangeable. The suffix matters. |
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Also Known As / Related Part Numbers
The following numbers and descriptions may appear in parts diagrams, distributor listings, or customer searches. Related numbers are provided to help identify the correct part, not to claim every number is an exact one-for-one substitute.
- K73-36109-1
- 73-36109-1
- LM-K73-36109-1
Technician Note
Do not assume K73-36109 and K73-36109-1 are interchangeable. The suffix matters. When replacing a chassis, shaft, or other core mechanical service part, inspect surrounding hardware, bearings, sprockets, chain path, limit components, covers, seals, and mounting points. A damaged supporting part can cause repeat failure if the original cause is not corrected.
Before Ordering
- Match the operator model number and suffix from the nameplate.
- Compare the original part number with the parts diagram for that exact operator generation.
- Inspect related hardware for damage, wear, corrosion, or missing fasteners.
- Confirm whether the repair involves a slide gate, swing gate, residential, light commercial, or heavy commercial operator platform.
- Do not substitute similar-looking LiftMaster chassis or shaft parts unless the manufacturer parts diagram confirms the match.
Professional Advisory
Gate operators can move heavy gates with significant force. Structural and drive-system repairs should be performed by a qualified gate technician when there is cabinet damage, shaft damage, limit travel trouble, electrical exposure, unsafe movement, or missing safety equipment. After the repair, the operator should be tested for proper travel, secure mounting, smooth movement, and required entrapment protection.
Important Ordering Warning
Several LiftMaster chassis and shaft kits use very similar part numbers. Suffixes such as -1, -2, and -5 are important and may identify a different operator platform. Do not assume interchangeability based only on a partial number or product appearance.
Questions & Answers
The LiftMaster K73-36109-1 is used as a replacement chassis replacement kit for select LiftMaster gate operator service repairs where the original part is damaged, worn, corroded, or no longer supporting the operator correctly.
Which operators are commonly associated with K73-36109-1?
This part is commonly associated with RSW12UL residential/light commercial swing gate operators, RSW12U / RSW12ULMC references when confirmed by diagram. Other model references should be treated as verify-by-parts-diagram applications unless the installed operator breakdown lists this exact part number.
Can I order K73-36109-1 by matching the picture only?
No. Many LiftMaster chassis, shaft, and mechanical service parts look similar. Match the operator model label, part number, mounting layout, and parts diagram before ordering.
What symptoms can point to a failed or damaged chassis replacement kit?
Possible symptoms include loose or shifting components, poor gate movement, binding, unusual noise, uneven cover fit, damaged mounting points, corrosion, or visible frame/shaft damage.
Should this part be installed by a technician?
Professional installation is recommended. These parts can affect alignment, travel limits, chain path, arm geometry, or high-load gate movement, and the operator should be tested with all required safety devices after service.
