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LockNLube Pressure Return Valve (PRV) for Cordless Grease Guns – (LNL81300-M-ANZ / LNL81300-D-ANZ / LNL81300-MK-ANZ) Troubleshooting

An innovative Pressure Return Valve attachment for cordless grease guns that relieves built-up pressure in the grease hose with a twist of a knob.

  • General Design
    • Simple, robust valve with return pathway
    • Requires minimal maintenance under normal use
  • Post‑Installation Checks
    • Ensure PRV is tightened correctly onto the grease gun using wrench flats
    • Ensure hose is snug on the PRV outlet
    • Thread sealant or Teflon tape may be used if needed, though O‑rings/washers usually seal adequately
  • Pressure Return Not Working
    • Verify grease cartridge is not completely full (air space is required for return grease)
    • Ensure PRV knob is fully opened (typically activates within about half a turn)
    • You should feel pressure release when opened correctly
  • Best Practice Tip
    • Always open the PRV before attempting to remove the coupler
    • If the coupler feels stuck, stop and relieve pressure using the PRV
  • Leaks Around Knob
    • Grease seepage around the knob stem may indicate a worn or damaged O‑ring
    • Contact LockNLube for support; replacement O‑ring or unit may be provided (rare)
  • Cleaning & Corrosion Prevention
    • Steel body should be wiped clean after use
    • Dry after exposure to moisture, rain, or caustic greases
    • Do not submerge in water
  • Compatibility Warning
    • Use only on specified grease gun models
    • Each PRV variant is sized for specific brands and thread patterns
    • Force‑fitting on unsupported models can cause leaks, damage, and void warranty
  • Lubrication Tip
    • Occasionally open the PRV during greasing to allow fresh grease to lubricate internal valve components
  • Routine Inspection
    • Check that the knob has not loosened during transport
    • No disassembly required for normal operation
  • Stiff Knob Operation
    • May be caused by dried grease internally
    • Cycle the knob open and closed during use to flush fresh grease through
  • Handling
    • Avoid dropping the grease gun on the PRV body
    • Treat with the same care as the grease gun itself
    • Designed to last the life of the tool with proper handling