---
title: LockNFlate XL Locking Air Chucks for Large Bore Tire Valves (Open Flow & Closed Flow – LNL65021-BSPT & LNL65022-BSPT) - Troubleshooting
description: Help
---

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1. [Macnaught Group Help](https://kb.macnaughtgroup.com/?hsLang=en-au)
2. [Product Troubleshooting & Maintenance](https://kb.macnaughtgroup.com/product-troubleshooting-maintenance?hsLang=en-au)
3. [Air Equipment](https://kb.macnaughtgroup.com/product-troubleshooting-maintenance?hsLang=en-au#air-equipment)

10 February 2026

# LockNFlate XL Locking Air Chucks for Large Bore Tire Valves (Open Flow & Closed Flow – LNL65021-BSPT & LNL65022-BSPT) - Troubleshooting

## Heavy-duty LockNFlate® XL tire chucks designed for large bore (VG12/12V1) Schrader-type valves on big equipment. These right-angle locking air chucks feature a ~4″ extended nose for deep wheel recesses and six hardened steel jaws that lock onto “big bore” valve stems. Two models are offered – an Open-Flow and a Closed-Flow version – both with 1/4″ BSPT threaded inlets for compatibility with regional air hose standards (functionally identical to the 1/4″ NPT U.S. models). Once clamped on, the chuck creates a secure, leak-free connection and allows hands-free, high-volume tire inflation up to 250 PSI.

- **Attaching the Chuck** 
    - Fully depress the thumb lever
    - Push chuck onto the large bore valve stem until fully seated
    - Release lever to lock jaws onto valve threads
- **Air Leakage** 
    - Usually indicates the chuck is not fully latched
    - Remove and reattach with firm pressure until lock engages
- **Detaching the Chuck** 
    - Always press the thumb lever to retract jaws before removing
    - Lever safely vents trapped air
    - Can release cleanly even with up to **250 PSI** residual pressure
- **Airflow Issues** 
    - Confirm correct model is being used: 
          - Open‑Flow on direct air lines will bleed air continuously (normal)
          - Closed‑Flow on controlled inflators will block air until engaged (normal)
- **Valve Core Considerations** 
    - Open‑Flow models typically do **not** depress valve cores
    - For fastest inflation, valve cores are often removed in large‑tire service
    - To inflate through an installed valve core, use the **Closed‑Flow** model
- **Cleaning & Lubrication** 
    - Keep chuck clean in dusty or harsh environments
    - Periodically apply light oil or penetrating lubricant to jaw collar and internals
    - Cycle thumb lever during lubrication to flush debris
- **Disassembly Warning** 
    - Do not disassemble the chuck
    - No user‑serviceable internal parts
- **Storage** 
    - Protect from dirt and moisture when not in use
    - Use a rubber cap or store hose end in a clean location
- **Summary** 
    - Minimal maintenance required
    - Cleaning and light lubrication ensure long service life

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    - [Grease Equipment](https://kb.macnaughtgroup.com/product-applications?hsLang=en-au#grease-equipment)
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