LiftMaster K73-34637 Chassis
The LiftMaster K73-34637 chassis is a replacement structural frame for select LiftMaster RSW Series swing gate operators. The chassis is the base structure that keeps the motor, gear reducer, control area, brackets, and mechanical drive components aligned. A bent, rusted, cracked, or damaged chassis can cause more than a cosmetic problem; it can shift the relationship between the drive parts and create binding, vibration, water exposure, or poor cover fit. This type of part is commonly used for operator rebuilds after cabinet damage, corrosion, impact damage, or severe wear around mounting points.
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
Various LiftMaster RSW Series swing gate operators. RSW12 style applications are commonly associated, but the correct chassis should be verified by the operator label and parts breakdown.
- various LiftMaster RSW Series swing gate operators
- RSW12 Series when confirmed by parts diagram
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Chassis |
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| Part Number | K73-34637 |
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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 | Various LiftMaster RSW Series swing gate operators. RSW12 style applications are commonly associated, but the correct chassis should be verified by the operator label and parts breakdown. |
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| Included Components | Replacement chassis frame only unless the product listing specifically states that hardware or additional components are included. |
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| Notes | RSW chassis variations can differ by generation. Match the exact chassis part number from the parts diagram. |
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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.
- K73-34637
- 73-34637
- LM-K73-34637
Technician Note
RSW chassis variations can differ by generation. Match the exact chassis part number from the parts diagram. 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
What is the LiftMaster K73-34637 used for?
The LiftMaster K73-34637 is used as a replacement chassis 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 K73-34637?
This part is commonly associated with various LiftMaster RSW Series swing gate operators, RSW12 Series when confirmed by parts 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 K73-34637 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?
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.
