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

Repair Kits
- No dedicated PRV repair or rebuild kits are sold
- Not intended for user servicing beyond basic checks
Failure Resolution
- Typical solution is warranty replacement or unit swap
- Internal valve sticking or worn knob O‑ring are rare
Minor Field Fixes
- Knob is secured with a set screw; retighten if loose
- Internal O‑rings may be matched with generic equivalents if damaged, though not officially supplied
Troubleshooting Before Replacement
- Confirm PRV is installed on a supported grease gun model
- Ensure return path into the cartridge is not blocked
- Nearly empty cartridges may have the plunger fully forward, leaving no return space
- Installing a new cartridge or backing the plunger slightly can restore function
When to Contact LockNLube
- Knob spins freely with no pressure relief
- Knob is jammed and cannot be turned
- Persistent leaks or failure despite correct installation
Summary
- No user maintenance kit required
- Any non‑trivial issues are handled by the manufacturer
- Periodic external cleaning is usually all that’s needed

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.