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Hose End Trigger Gun Gardena Premium Metal Spray G8107 leaking

Leaks continuously from the trigger

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  • Gary Nason Jan 08, 2013

    the gardena G8107 is a garden hose spray and I cannot dismantle it. can someone show me how?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 1383 Answers

SOURCE: Trigger problems

I have repaird hundreds of nail guns with a problem similar to yours. Depending on the brand and model, the problem can be repaired by checking the following. Headvalve orings should be checked for wear and any surface that the orings contact must be smooth and free from scratches. If the surfaces are scratched try to smooth with fine sandpaper and use light grease instead of oil when assembling. The safety contact foot may not be reaching high enough into the trigger to properly push in the trigger button. Check for worn spots on the trigger that may be filled in with epoxy, loose fitting trigger caused by worn roll pin or retaining pin. Some of the trigger valves as used on many bostitch nailers (tva6 valve) used a plastic pin which contacts the trigger. If this pin is loose or worn the valve should be replaced. Some tva6 valves have a vinyl looking sort of oring that fits too loose on the spool. This vinyl oring in not available by itself but if the oring fits too loose the gun will not fire and leak air. On bostitch remove the trigger and the rollpins holding the trigger valve and apply air to gun to eject valve. (use heavy glove to catch valve as it will come out with force)

Posted on Nov 25, 2008

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rowdy45176
  • 2176 Answers

SOURCE: Air leaks arond trigger when depressed, but no nail fires.

Where does the air leak out from? If it leaks from the trigger DeWalt makes a trigger valve assembly part # 641006-00 list 8.89 BUT if it leaks from other areas we have to look into it deeper. If it is just the trigger valve let me know and I will give you instructions how to remove and install the new one.

Posted on Feb 06, 2009

  • 1383 Answers

SOURCE: air leak on framing gun

You can repair this gun. Parts and breakdown are at www.bostitch.com look for service /parts and enter your model number. There you will the parts available for purchase. You will need the tva11 trigger valve. Easy to install. Remove roll pins that hold trigger and trigger valve. Remove the trigger to expose the tva11 valve. With the roll pin/s removed that hold the trigger valve you will be connecting air supply. Use heavy glove to catch valve as you apply air pressure. You may reduce pressure to airline to reduce pop-out force. Before you install the new valve check port for sharp edges and debris. Good luck with your repair.

Posted on Mar 16, 2009

rick_amick
  • 69 Answers

SOURCE: not spraying

Sounds like you need to completly dissasemble and clean thorougly.

Posted on Mar 23, 2009

  • 1383 Answers

SOURCE: Stanley Framing Nailer Leaking Air Around Trigger

Your tva11 valve can be repaired easily if you have a source for orings. I purchase orings from several companies including lowes (in plumbing dept sold in 10 pack for about dollar), www.grainger.com (oring kit metric, cost about $10) harbor freight (oring kit about $5), also orings are sold by size at bearing companies. I have repaired many of these valves by just cleaning debris and lubing with silicone paste (sold at lowes in plumbing dept used for lubing faucet orings). To attempt repair of valve, remove nails, remove roll pin that holds trigger (3mm) to expose tva11 valve. Mark position of valve in body of gun because the retaining pins fit thru an indention in the valve. Next remove roll pin/s that hold tva11 valve, they are just above the valve in the body of the gun(3mm x 30mm). You will need to apply air pressure to gun to remove the valve, however use heavy glove to catch valve because it can come out with force. (try lowering air pressure to gun for this procedure. With valve in hand, use marker to mark position of inner part in relation to outer, remove the two pins that hold valve together. Push out the inner cylinder and look at the middle oring(usually the problem, could be loose or cut) , If cut or loose replace and lube with silicone paste and re-assemble. Check outer orings for nicks, replace as necessary (usually good). Clean valve port, lube port, then re-install valve into gun and insert temporary retaining pin and test for leak. You should be good to go. Good luck and email if you have questions.

Posted on Mar 30, 2009

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1 Answer

I have a Bostitch N80S stick framing nailer that leaks air from the trigger area. I replaced the entire trigger valve with a new single fire trigger to see if the old bump fire trigger was the problem


Remove the nails and take off the trigger to expose the trigger valve (usually part # tva6). Connect air and spray soapy water on the valve to determine if the air is leaking from the center of the valve or around the outer edge between the body and valve. If leaking from the center, could be defective valve or debris under oring. Pop out the valve and examine internal parts for cut oring or defect. If leaking from between body, you could have cut orings installing the valve. Make sure that there are no rough edges in the body of the gun. Bump fire or single fire happens with the trigger type not the valve. Bump fire trigger is usually black metal and single fire trigger is light color plastic. Good luck

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Leak around trigger could be trigger valve internal orings or orings on the outside of the trigger valve making contact against the body of the gun. Spray soapy water to determine where the air is leaking from. If air is leaking around the outside of the valve, most likely the orings were cut upon installation of the valve. If leaking from internal valve, most likely worn or broken oring; easy to fix if you have a source for orings.

To remove the trigger valve for service or inspection (take close-up photo of trigger area for reference ):
disconnect airline, remove nails, remove trigger retainer pin, remove trigger, remove roll pin /s holding trigger valve in place (use 3mm punch to remove retainer roll pins which are located in the body of the gun just above the trigger valve). With retainer pin/s removed and with gloved hand (under trigger valve), apply air pressure to gun to blow out the trigger valve (use lower pressure to push out trigger valve because it could come out with force.). With trigger valve in hand notice that there are two slots or groove cut neer top of the valve where the retainer pins rest, you will need to reinstall valve into body with slots aligned to retainer pins. Remove retainer pins holding trigger together to pull out internal valve. Good luck and post again if your have other question about the trigger valve.

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1 Answer

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I have the 2 1/2 Hitachi for nailing siding. The nail gun had not been used for a couple of years, but now will only drive the nail half way in. Sounds like an air leak when driving the nail. I have...


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2 Answers

Air leaks arond trigger when depressed, but no nail fires.


Where does the air leak out from? If it leaks from the trigger DeWalt makes a trigger valve assembly part # 641006-00 list 8.89 BUT if it leaks from other areas we have to look into it deeper. If it is just the trigger valve let me know and I will give you instructions how to remove and install the new one.

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