GTO Limit Nut for DC SL2000B Slider Gate Openers
The R4422 limit nut kit is used in the mechanical limit system on select GTO, Linear PRO and Mighty Mule DC slide gate operators. In these operators, the limit nuts move along a threaded shaft as the gate travels. When the nuts contact the limit switch plate, the control system knows where to stop the gate in the open and closed directions. If the nuts are worn or damaged, the operator may lose repeatable stopping points or may need constant readjustment.
This part is commonly associated with SL1000B and SL2000B DC slide operator service repairs. Limit nuts are often replaced after the original parts become stripped, brittle, broken, or lost during service. They may also be needed when the gate overtravels, stops short, or the limit switch plate no longer rests properly in the grooves on the nuts.
Correct limit adjustment should be done carefully. Hands, clothing and tools must be kept away from moving sprockets, chain and limit components. If the gate is traveling too far because of a control problem, broken switch, loose chain or mechanical gate issue, replacing the limit nuts alone may not solve the problem.
Compatible With
The R4422 limit nut kit is commonly used with these DC slide gate operator applications:
- GTO / Linear PRO SL1000B DC slide gate opener
- GTO / Linear PRO SL2000B DC slide gate opener
- Select Mighty Mule / GTO DC slider operator limit systems using R4422 nuts
- Commonly searched for as SL1000B limit nut, SL2000B limit nut and DC slider limit nut kit
- Verify fitment on GPX or other slide models by original parts diagram before ordering
Features & Specifications
| Manufacturer | GTO / Linear PRO / Mighty Mule family |
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| Product Type | Limit nut kit |
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| Part Number | R4422 |
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| Application | Open and close limit adjustment on DC slide gate operators |
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| Compatible Operator Type | Select DC chain-drive slide gate openers |
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| Included Components | Limit nuts; kit contents may vary by supplier |
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| Notes | Works with the operator limit shaft and limit switch plate |
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Also Known As / Related Part Numbers
- R4422
- LIN-R4422
- GTO R4422
- Linear R4422
- SL1000B limit nut
- SL2000B limit nut
- DC slider limit nut kit
Technician Note
After replacing limit nuts, cycle the gate slowly and adjust the open and close limits according to gate direction. The limit switch plate must seat correctly in the grooves on the nuts.
Before Ordering Checklist
- Confirm the operator is a compatible DC slide model such as SL1000B or SL2000B.
- Compare the original limit nuts to R4422 before ordering.
- Inspect the threaded shaft, switch plate and limit switches for wear or damage.
- Check gate travel direction before adjusting open and close limits.
- Keep hands and clothing away from moving chain, sprockets and limit hardware during testing.
Important Ordering Warnings
Limit system parts may look similar across slide operators but are not always interchangeable. Verify the original parts diagram if the operator is not clearly an SL1000B or SL2000B.
Professional Advisory
If the gate runs past its stops, hits the post, or will not respond to limit adjustment, stop using the operator until the limit system and safety devices are inspected.
Product Questions & Answers
What does the R4422 limit nut do?
The R4422 limit nut works with the limit shaft and switch plate to set where a compatible DC slide gate opener stops in the open and closed directions.
Which models commonly use the R4422 kit?
It is commonly associated with GTO/Linear PRO SL1000B and SL2000B DC slide gate openers. Other slide models should be verified by parts diagram.
What happens when limit nuts are worn or stripped?
The gate may stop short, travel too far, lose its limit setting, or require repeated adjustment because the nut no longer actuates the limit switch plate correctly.
Are the open and close limit nuts adjusted the same way on every gate?
No. Adjustment depends on whether the gate opens left-to-right or right-to-left. Follow the operator manual for the correct nut and direction.
Should I replace the limit switch too?
Not automatically. Inspect the switch plate, limit switches and shaft. If the switch is damaged or not being actuated, additional parts may be needed.
