Skip to content
  • There are no suggestions because the search field is empty.

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