Question about RTO Iwata 1.4 W-400 Gravity Feed Spray Gun, Gun Only # 4705

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Iwata w400 air leak behind trigger problem

Need help on fixing my w4oo gravity spray gun. i have serviced replaced the air valve seat, air valve, o ring and the air valve shaft but cannot stop the air from coming out the air valve shaft behind the trigger they are a basic type setup but this has me stumped. i have also taken to the paint shop and he cannot find the problem and thats his job ???
plese help

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Have you traced the exact spot of the leak?
I will assume you have not. the reason it's important is because if there is a crack in the o-ring seat there is nothing you can do. So trace the leak. Try a small amount of auto air conditioner leak detector or something similar even ink from an ink pen will work. Place it in the air inlet, hook up your air line and trigger your gun for a 10 to 15 seconds. disassemble your trigger and see if you can locate the offending spot. Though this method has worked for me in the past, it's not something I would normally recommend. However the gun you have is to expensive to just write off.
The alternative is to contact Iwata and seek help.
Good luck.

Posted on Jul 21, 2009

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Posted on Jan 02, 2017

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