Symptoms
- Water drips from the gun even when the trigger is released
- Trigger feels stuck or very hard to pull
- Water leaks from around the trigger handle
- Gun doesn't fully shut off flow when released
Likely causes
- CommonWorn internal O-ring or seal in the gunThese small seals wear out with regular use and are the most common source of gun leaks.
- CommonDebris lodged in the valve seatSand or grit can prevent the internal valve from seating fully, causing a drip.
- PossibleCracked gun housingDropping the gun or age-related plastic fatigue can crack the body itself.
- PossibleSafety lock engaged incorrectly or damagedA jammed or broken safety catch can prevent the trigger from moving freely.
What to do
- Relieve system pressure by turning off the machine and squeezing the trigger before inspecting the gun.
- Check the safety lock on the gun isn't accidentally engaged or damaged.
- Look for visible cracks in the gun's plastic housing, which would mean replacement rather than repair.
- If it's dripping, most guns can be opened (check the manual) to access and inspect the internal O-rings for wear.
- Clean any visible grit from the valve area with water before reassembling.
- Replace worn O-rings with the correct size, or replace the whole trigger gun assembly, which is often inexpensive and universal-fit.
- Test at low pressure first after reassembly to confirm the leak is resolved before full use.
Tools and parts
- Small screwdriver or gun disassembly tool
Pressure washer trigger gun O-ring kitSearch: “pressure washer gun repair O-ring kit”
Replacement trigger gunSearch: “universal pressure washer trigger gun”
When to call a pro
Trigger guns are cheap and simple enough that most people replace rather than repair a badly worn one; a shop visit usually isn't necessary.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.