510105 US Automatic Patriot Actuator Limit Shaft - Gear Not Included
The US Automatic 510105 is the limit shaft used in the travel-limit mechanism of select Patriot swing gate linear actuators. The shaft supports the motion transfer between the actuator drive system and the limit assembly, helping the operator determine the correct stopping points. It is commonly serviced along with the 501105 blue limit drive gear and 510103 limit switch assembly. A bent, worn, or damaged shaft can cause poor gear mesh, erratic limit response, stripped gear teeth, or inconsistent gate stopping. This item is often misunderstood because the blue gear is not included. When rebuilding the limit mechanism, make sure the gear, switch assembly, limit nut, actuator screw, and bracket geometry are all in good condition before returning the operator to service.
Compatible With
This compatibility list is based on known US Automatic Patriot service-part usage and should be verified against the original operator label, actuator parts diagram, and existing part number before ordering.
- US Automatic Patriot swing gate linear actuator arms
- Patriot heavy-duty swing gate openers using the original US Automatic actuator assembly
- Patriot single swing gate installations where the actuator parts diagram calls for this service part
- Patriot dual swing gate systems when each actuator uses the same matching service component
- Select older Patriot actuator assemblies when confirmed by the original part number and parts diagram
Also Known As / Related Part Numbers
- 510105
- US-510105
- USA 510105
- Patriot actuator limit shaft
- limit shaft without gear
- Patriot limit assembly shaft
- 501105 related blue limit drive gear - sold separately
- 510103 related limit switch assembly
- 510102 related limit nut
Features & Specifications
| Manufacturer | US Automatic |
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| Product Type | Patriot actuator limit shaft |
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| Part Number | 510105 |
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| Application | Limit assembly shaft for Patriot actuator |
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| Compatible Operator Type | US Automatic Patriot swing gate linear actuator |
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| Material / Finish | Hardened steel |
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| Included Components | Limit shaft only; gear not included unless listing states otherwise |
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| Notes | Order 501105 separately if the blue limit drive gear is also needed |
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Technician Note
Gear not included. If the old blue gear is damaged, order 501105 separately and inspect the limit switch assembly before reassembly.
Before Ordering Checklist
- Confirm the actuator is a Patriot swing gate linear actuator.
- Verify the old part needed is the limit shaft, not the complete limit switch assembly.
- Order 501105 separately if the blue limit gear is damaged or missing.
- Inspect the limit nut and switch assembly for wear or misalignment.
- Reset and test travel limits after service.
Professional Advisory
Internal actuator service can affect gate travel, limit adjustment, and safe stopping behavior. Disconnect power before service and have a qualified gate technician handle repairs if the actuator binds, the gate moves unexpectedly, or electrical damage is present.
Product Questions & Answers
Does 510105 include the blue limit gear?
No. 510105 is the limit shaft only. The blue limit drive gear is part number 501105 and is commonly sold separately.
What does the limit shaft do?
It supports the Patriot actuator limit mechanism and works with the blue gear and limit switch assembly to control travel positions.
When should the limit shaft be replaced?
Replace it when it is worn, bent, corroded, damaged, or causing poor engagement with the limit gear.
Is this a complete limit switch kit?
No. It is not the complete 510103 limit switch assembly. It is a separate shaft service part.
Do I need to reset limits after replacing it?
Yes. Any actuator limit-system repair should be followed by open and close limit adjustment and safe test cycling.
