LiftMaster K72-40359 Limit and Drive Shaft Kit
The LiftMaster K72-40359 limit and drive shaft kit services the shaft assembly that links the gate operator's drive system with its mechanical travel limit system. On compatible commercial slide operators, this area supports the limit nuts, bearings, drive sprocket, keyway hardware, and related shaft components that help the operator stop at the correct open and close positions. A worn or damaged limit/drive shaft can cause erratic limit travel, noisy operation, loose sprockets, shaft wobble, or inconsistent gate stopping points. This is a precision mechanical service kit, so the correct operator family and parts diagram matter more than the product photo.
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 SL920 and SL930 slide gate operators are the strongest supported applications. Some references also associate K72-40359 with SL3000 / SL3000UL and CSW200 style Elite professional operator assemblies where that exact shaft configuration is shown in the parts diagram.
- SL920 slide gate operators
- SL930 slide gate operators
- select SL3000 / SL3000UL and CSW200 style Elite references when confirmed by diagram
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Limit and Drive Shaft Kit |
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| Part Number | K72-40359 |
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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 SL920 and SL930 slide gate operators are the strongest supported applications. Some references also associate K72-40359 with SL3000 / SL3000UL and CSW200 style Elite professional operator assemblies where that exact shaft configuration is shown in the parts diagram. |
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| Included Components | Limit/drive shaft assembly with bearings, limit nuts, sprocket 41B20, keyway hardware, set screws, woodruff key, shim washers, bolts, flange nuts, and retaining hardware when supplied by the manufacturer. |
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| Notes | This kit is not a generic shaft kit. Confirm the existing shaft, sprocket, keyway, and limit nut arrangement before ordering. |
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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.
- K72-40359
- 72-40359
- LM-K72-40359
- K1 K72-40359
- A K72-40359
- Limit/Drive Shaft Assembly
- 41B20 sprocket reference
Technician Note
This kit is not a generic shaft kit. Confirm the existing shaft, sprocket, keyway, and limit nut arrangement before ordering. 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 K72-40359 used for?
The LiftMaster K72-40359 is used as a replacement limit and drive shaft 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 K72-40359?
This part is commonly associated with SL920 slide gate operators, SL930 slide gate operators. 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 K72-40359 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 limit and drive shaft 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.
